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As the possibility of API reuse is similarly possible within the domain of video encoding as it is for video coding in general, this proposal follows the same principle to extend ",{"type":10,"tag":89,"props":103,"children":105},{"className":104},[],[106],{"type":15,"value":94},{"type":15,"value":108}," with codec-independent video encoding capabilities.",{"type":10,"tag":17,"props":110,"children":112},{"id":111},"_proposal",[113],{"type":15,"value":114},"Proposal",{"type":10,"tag":116,"props":117,"children":119},"h3",{"id":118},"_video_encode_queues",[120],{"type":15,"value":121},"Video Encode Queues",{"type":10,"tag":11,"props":123,"children":124},{},[125,127,132,134,140],{"type":15,"value":126},"While ",{"type":10,"tag":89,"props":128,"children":130},{"className":129},[],[131],{"type":15,"value":94},{"type":15,"value":133}," already includes support for a more fine grained query to determine the set of supported video codec operations for a given queue family, this extension introduces an explicit queue flag called ",{"type":10,"tag":89,"props":135,"children":137},{"className":136},[],[138],{"type":15,"value":139},"VK_QUEUE_VIDEO_ENCODE_BIT_KHR",{"type":15,"value":141}," to indicate support for video encoding.",{"type":10,"tag":11,"props":143,"children":144},{},[145,147,153],{"type":15,"value":146},"Applications can use this flag bit to identify video encode capable queue families in general, if needed, before querying more details about the individual video codec operations supported through the use of the ",{"type":10,"tag":89,"props":148,"children":150},{"className":149},[],[151],{"type":15,"value":152},"VkQueueFamilyVideoPropertiesKHR",{"type":15,"value":154}," structure. 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This extension does not introduce any video encode operation flags, as that is left to the codec-specific encode extensions.",{"type":10,"tag":11,"props":216,"children":217},{},[218,220,225],{"type":15,"value":219},"On the other hand, this extension allows the application to specify usage information specific to video encoding by chaining the following new structure to ",{"type":10,"tag":89,"props":221,"children":223},{"className":222},[],[224],{"type":15,"value":204},{"type":15,"value":226},":",{"type":10,"tag":228,"props":229,"children":234},"pre",{"className":230,"code":231,"language":232,"meta":233,"style":233},"language-c shiki shiki-themes github-light-default github-dark-default","typedef struct VkVideoEncodeUsageInfoKHR {\n VkStructureType sType;\n const void* pNext;\n VkVideoEncodeUsageFlagsKHR videoUsageHints;\n VkVideoEncodeContentFlagsKHR videoContentHints;\n VkVideoEncodeTuningModeKHR tuningMode;\n} 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The new query command ",{"type":10,"tag":89,"props":542,"children":544},{"className":543},[],[545],{"type":15,"value":546},"vkGetPhysicalDeviceVideoEncodeQualityLevelPropertiesKHR",{"type":15,"value":548},", as described later, may also return different recommended configuration parameters based on the tuning mode specified in the video profile in order to further aid application developers in choosing the most suitable settings for the encoding scenario at hand.",{"type":10,"tag":116,"props":550,"children":552},{"id":551},"_new_pipeline_stage_and_access_flags",[553],{"type":15,"value":554},"New Pipeline Stage and Access Flags",{"type":10,"tag":11,"props":556,"children":557},{},[558,560,566],{"type":15,"value":559},"This extension also introduces a new pipeline stage identified by the ",{"type":10,"tag":89,"props":561,"children":563},{"className":562},[],[564],{"type":15,"value":565},"VK_PIPELINE_STAGE_2_VIDEO_ENCODE_BIT_KHR",{"type":15,"value":567}," flag to enable synchronizing video encode operations with respect to other Vulkan operations.",{"type":10,"tag":11,"props":569,"children":570},{},[571],{"type":15,"value":572},"In addition, two new access flags are introduced to indicate reads and writes, respectively, performed by the video encode pipeline stage:",{"type":10,"tag":29,"props":574,"children":575},{},[576,585],{"type":10,"tag":33,"props":577,"children":578},{},[579],{"type":10,"tag":89,"props":580,"children":582},{"className":581},[],[583],{"type":15,"value":584},"VK_ACCESS_2_VIDEO_ENCODE_READ_BIT_KHR",{"type":10,"tag":33,"props":586,"children":587},{},[588],{"type":10,"tag":89,"props":589,"children":591},{"className":590},[],[592],{"type":15,"value":593},"VK_ACCESS_2_VIDEO_ENCODE_WRITE_BIT_KHR",{"type":10,"tag":11,"props":595,"children":596},{},[597,599,605],{"type":15,"value":598},"As these flags did no longer fit into the legacy 32-bit enums, this extension requires the ",{"type":10,"tag":89,"props":600,"children":602},{"className":601},[],[603],{"type":15,"value":604},"VK_KHR_synchronization2",{"type":15,"value":606}," extension and relies on the 64-bit versions of the pipeline stage and access mask flags to handle synchronization specific to video encode operations.",{"type":10,"tag":116,"props":608,"children":610},{"id":609},"_new_buffer_and_image_usage_flags",[611],{"type":15,"value":612},"New Buffer and Image Usage Flags",{"type":10,"tag":11,"props":614,"children":615},{},[616],{"type":15,"value":617},"This extension introduces the following new buffer usage flags:",{"type":10,"tag":29,"props":619,"children":620},{},[621,632],{"type":10,"tag":33,"props":622,"children":623},{},[624,630],{"type":10,"tag":89,"props":625,"children":627},{"className":626},[],[628],{"type":15,"value":629},"VK_BUFFER_USAGE_VIDEO_ENCODE_SRC_BIT_KHR",{"type":15,"value":631}," is reserved for future use",{"type":10,"tag":33,"props":633,"children":634},{},[635,641],{"type":10,"tag":89,"props":636,"children":638},{"className":637},[],[639],{"type":15,"value":640},"VK_BUFFER_USAGE_VIDEO_ENCODE_DST_BIT_KHR",{"type":15,"value":642}," allows using the buffer as a video bitstream buffer in video encode operations",{"type":10,"tag":11,"props":644,"children":645},{},[646],{"type":15,"value":647},"This extension also introduces the following new image usage flags:",{"type":10,"tag":29,"props":649,"children":650},{},[651,662,672],{"type":10,"tag":33,"props":652,"children":653},{},[654,660],{"type":10,"tag":89,"props":655,"children":657},{"className":656},[],[658],{"type":15,"value":659},"VK_IMAGE_USAGE_VIDEO_ENCODE_SRC_BIT_KHR",{"type":15,"value":661}," allows using the image as an encode input picture",{"type":10,"tag":33,"props":663,"children":664},{},[665,671],{"type":10,"tag":89,"props":666,"children":668},{"className":667},[],[669],{"type":15,"value":670},"VK_IMAGE_USAGE_VIDEO_ENCODE_DST_BIT_KHR",{"type":15,"value":631},{"type":10,"tag":33,"props":673,"children":674},{},[675,681],{"type":10,"tag":89,"props":676,"children":678},{"className":677},[],[679],{"type":15,"value":680},"VK_IMAGE_USAGE_VIDEO_ENCODE_DPB_BIT_KHR",{"type":15,"value":682}," allows using the image as an encode DPB picture (reconstructed/reference picture)",{"type":10,"tag":11,"props":684,"children":685},{},[686,688,694,696,702,704,710],{"type":15,"value":687},"Specifying these usage flags alone is not sufficient to create a buffer or image that is compatible with a video session created against any particular video profile. 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No similar requirement exists for the encode input picture specified by ",{"type":10,"tag":89,"props":1330,"children":1332},{"className":1331},[],[1333],{"type":15,"value":1144},{"type":15,"value":1335}," which can refer to any video picture resource.",{"type":10,"tag":11,"props":1337,"children":1338},{},[1339,1340,1346,1347,1352,1353,1358],{"type":15,"value":1201},{"type":10,"tag":89,"props":1341,"children":1343},{"className":1342},[],[1344],{"type":15,"value":1345},"pSetupReferenceSlot→pPictureResource→imageViewBinding",{"type":15,"value":1209},{"type":10,"tag":89,"props":1348,"children":1350},{"className":1349},[],[1351],{"type":15,"value":680},{"type":15,"value":1121},{"type":10,"tag":89,"props":1354,"children":1356},{"className":1355},[],[1357],{"type":15,"value":693},{"type":15,"value":1222},{"type":10,"tag":11,"props":1360,"children":1361},{},[1362,1364,1370],{"type":15,"value":1363},"The image subresource backing the reconstructed picture has to be in the new ",{"type":10,"tag":89,"props":1365,"children":1367},{"className":1366},[],[1368],{"type":15,"value":1369},"VK_IMAGE_LAYOUT_VIDEO_ENCODE_DPB_KHR",{"type":15,"value":1235},{"type":10,"tag":11,"props":1372,"children":1373},{},[1374,1376,1381,1383,1388],{"type":15,"value":1375},"If the video profile in use requires additional codec-specific parameters for the reconstructed picture, then such parameters are provided in the ",{"type":10,"tag":89,"props":1377,"children":1379},{"className":1378},[],[1380],{"type":15,"value":701},{"type":15,"value":1382}," chain of ",{"type":10,"tag":89,"props":1384,"children":1386},{"className":1385},[],[1387],{"type":15,"value":1151},{"type":15,"value":1389},". Whether such codec-specific reconstructed picture information is necessary, and what it may contain is up to the codec-specific extensions.",{"type":10,"tag":116,"props":1391,"children":1393},{"id":1392},"_reference_pictures",[1394],{"type":15,"value":1395},"Reference Pictures",{"type":10,"tag":11,"props":1397,"children":1398},{},[1399,1401,1406],{"type":15,"value":1400},"If the video session allows, reference pictures can be specified in the ",{"type":10,"tag":89,"props":1402,"children":1404},{"className":1403},[],[1405],{"type":15,"value":1158},{"type":15,"value":1407}," array to provide predictions of the values of samples of the encoded picture.",{"type":10,"tag":11,"props":1409,"children":1410},{},[1411,1413,1418,1420,1426,1428,1434],{"type":15,"value":1412},"Each entry in the ",{"type":10,"tag":89,"props":1414,"children":1416},{"className":1415},[],[1417],{"type":15,"value":1158},{"type":15,"value":1419}," array adds one or more pictures, currently associated with the DPB slot specified in the element’s ",{"type":10,"tag":89,"props":1421,"children":1423},{"className":1422},[],[1424],{"type":15,"value":1425},"slotIndex",{"type":15,"value":1427}," member and stored in the video picture resource specified in the element’s ",{"type":10,"tag":89,"props":1429,"children":1431},{"className":1430},[],[1432],{"type":15,"value":1433},"pPictureResource",{"type":15,"value":1435}," member, to the list of active reference pictures to use in the video encode operation.",{"type":10,"tag":11,"props":1437,"children":1438},{},[1439,1441,1446],{"type":15,"value":1440},"The application has to make sure to specify each video picture resource used as a reference picture in a video encode operation, beforehand, in the set of bound reference picture resources specified when the video coding scope was started (in one of the elements of ",{"type":10,"tag":89,"props":1442,"children":1444},{"className":1443},[],[1445],{"type":15,"value":1326},{"type":15,"value":1447},").",{"type":10,"tag":11,"props":1449,"children":1450},{},[1451,1452,1458,1460,1465,1466,1471,1472,1477],{"type":15,"value":1201},{"type":10,"tag":89,"props":1453,"children":1455},{"className":1454},[],[1456],{"type":15,"value":1457},"pPictureResource→imageViewBinding",{"type":15,"value":1459}," of the elements of ",{"type":10,"tag":89,"props":1461,"children":1463},{"className":1462},[],[1464],{"type":15,"value":1158},{"type":15,"value":1209},{"type":10,"tag":89,"props":1467,"children":1469},{"className":1468},[],[1470],{"type":15,"value":680},{"type":15,"value":1121},{"type":10,"tag":89,"props":1473,"children":1475},{"className":1474},[],[1476],{"type":15,"value":693},{"type":15,"value":1222},{"type":10,"tag":11,"props":1479,"children":1480},{},[1481,1483,1488],{"type":15,"value":1482},"The image subresources backing the reference pictures have to be in the new ",{"type":10,"tag":89,"props":1484,"children":1486},{"className":1485},[],[1487],{"type":15,"value":1369},{"type":15,"value":1235},{"type":10,"tag":11,"props":1490,"children":1491},{},[1492,1494,1499],{"type":15,"value":1493},"Typically the number of elements in ",{"type":10,"tag":89,"props":1495,"children":1497},{"className":1496},[],[1498],{"type":15,"value":1158},{"type":15,"value":1500}," equals the number of reference pictures added, but in certain cases (depending on the used video codec and video profile) there may be multiple pictures in the same DPB slot resource.",{"type":10,"tag":11,"props":1502,"children":1503},{},[1504,1506,1511,1513,1518],{"type":15,"value":1505},"If the video profile in use requires additional codec-specific parameters for the reference pictures, then such parameters are provided in the ",{"type":10,"tag":89,"props":1507,"children":1509},{"className":1508},[],[1510],{"type":15,"value":701},{"type":15,"value":1512}," chain of the elements of ",{"type":10,"tag":89,"props":1514,"children":1516},{"className":1515},[],[1517],{"type":15,"value":1158},{"type":15,"value":1519},". Whether such codec-specific reference picture information is necessary, and what it may contain is up to the codec-specific extensions.",{"type":10,"tag":116,"props":1521,"children":1523},{"id":1522},"_video_encode_parameter_overrides",[1524],{"type":15,"value":1525},"Video Encode Parameter Overrides",{"type":10,"tag":11,"props":1527,"children":1528},{},[1529],{"type":15,"value":1530},"Encoder implementations usually only support a subset of the available encoding tools defined by the corresponding video compression standards. This may prevent some implementation from being able to respect certain codec-specific parameters, or specific parameter values.",{"type":10,"tag":11,"props":1532,"children":1533},{},[1534],{"type":15,"value":1535},"Enumerating exhaustively all of these constraints and potentially defining application-queryable capabilities corresponding to those is not practical, as it would potentially require separate capabilities for almost every single codec-specific parameter, parameter value, and combinations of those, as usually there are complicated interactions between those codec-specific parameters. Instead, this proposal approaches this problem from the other direction.",{"type":10,"tag":11,"props":1537,"children":1538},{},[1539],{"type":15,"value":1540},"Instead of defining capabilities for each of these constraints, implementations are allowed to override codec-specific parameter values or combinations thereof, so that the resulting overridden codec-specific parameters now comply to the constraints of the target implementation. This has multiple benefits:",{"type":10,"tag":29,"props":1542,"children":1543},{},[1544,1549,1554],{"type":10,"tag":33,"props":1545,"children":1546},{},[1547],{"type":15,"value":1548},"Enables the video encode APIs to be supported on a much wider set of hardware implementations, as the codec-specific extensions layered on top of this extension would not have codec-specific requirements that assume implementations to support certain, potentially not universally available, encoding tools",{"type":10,"tag":33,"props":1550,"children":1551},{},[1552],{"type":15,"value":1553},"Enables implementations to expose all of the encoding tools they support for a particular video compression standard, which typically is not possible in other video APIs as, without overrides, implementations may not be able to expose a large set of their encoding tools just because they do not comply to the exact wording of the capabilities defined by that API",{"type":10,"tag":33,"props":1555,"children":1556},{},[1557],{"type":15,"value":1558},"Enables writing portable applications without getting lost in myriads of capabilities",{"type":10,"tag":11,"props":1560,"children":1561},{},[1562],{"type":15,"value":1563},"Allowing implementations to override codec-specific parameters does not mean, however, that implementations can do any overrides they wish. The base parameter override mechanism is reserved to deal with implementation limitations only. Thus, by default, implementations are expected to override codec-specific parameters only if it is absolutely paramount for the correct functioning of their encoder hardware.",{"type":10,"tag":11,"props":1565,"children":1566},{},[1567,1569,1575],{"type":15,"value":1568},"In certain cases, applications may want to allow the implementation to make its own choices about the certain codec-specific parameters that are not driven by implementation constraints, but rather aim to allow the implementation to choose parameters and encoding tools that better fit the usage scenario described by the video profile and other parameters, like the encode quality level, than the one the application specified. This proposal introduces a new video session creation flag called ",{"type":10,"tag":89,"props":1570,"children":1572},{"className":1571},[],[1573],{"type":15,"value":1574},"VK_VIDEO_SESSION_CREATE_ALLOW_ENCODE_PARAMETER_OPTIMIZATIONS_BIT_KHR",{"type":15,"value":1576}," that enables the application to opt in to such optimization overrides.",{"type":10,"tag":11,"props":1578,"children":1579},{},[1580],{"type":15,"value":1581},"There are certain rules that implementations need to follow in all cases where they may apply codec-specific parameter overrides. In particular:",{"type":10,"tag":29,"props":1583,"children":1584},{},[1585,1590],{"type":10,"tag":33,"props":1586,"children":1587},{},[1588],{"type":15,"value":1589},"Certain codec-specific parameters are defined by layered codec-specific extensions to be always respected, and thus cannot be overridden, which is generally expected to be the case for all parameters that may affect the overall behavior of video encoding, or any bitstream elements that are not encoded in any fashion by the implementation, so that applications still have the necessary freedom to encode such auxiliary bitstream elements the way they wish",{"type":10,"tag":33,"props":1591,"children":1592},{},[1593],{"type":15,"value":1594},"In a similar vein, implementation overrides cannot affect the compliance of the generated bitstream to the video compression standard",{"type":10,"tag":11,"props":1596,"children":1597},{},[1598],{"type":15,"value":1599},"The details of these rules can be found in the specification language of this extension, and any layered extension built upon it.",{"type":10,"tag":11,"props":1601,"children":1602},{},[1603],{"type":15,"value":1604},"In general, there are two categories of codec-specific parameters to which implementation overrides may be applied:",{"type":10,"tag":65,"props":1606,"children":1607},{},[1608,1613],{"type":10,"tag":33,"props":1609,"children":1610},{},[1611],{"type":15,"value":1612},"Codec-specific parameters stored in video session parameters objects, if any",{"type":10,"tag":33,"props":1614,"children":1615},{},[1616],{"type":15,"value":1617},"Codec-specific parameters provided to video encode commands",{"type":10,"tag":11,"props":1619,"children":1620},{},[1621],{"type":15,"value":1622},"Both of these codec-specific parameter categories may have an effect on the video bitstream data produced by video encode operations. However, parameters falling into the first category are particularly important as it is common for applications to encode the codec-specific parameters stored in video session parameters on their own.",{"type":10,"tag":11,"props":1624,"children":1625},{},[1626],{"type":15,"value":1627},"In order to enable the application to deal with parameter overrides applied to video session parameters, this proposal introduces the following new command:",{"type":10,"tag":228,"props":1629,"children":1631},{"className":230,"code":1630,"language":232,"meta":233,"style":233},"VKAPI_ATTR VkResult VKAPI_CALL vkGetEncodedVideoSessionParametersKHR(\n VkDevice device,\n const VkVideoEncodeSessionParametersGetInfoKHR* pVideoSessionParametersInfo,\n VkVideoEncodeSessionParametersFeedbackInfoKHR* pFeedbackInfo,\n size_t* pDataSize,\n void* pData);\n",[1632],{"type":10,"tag":89,"props":1633,"children":1634},{"__ignoreMap":233},[1635,1652,1669,1694,1715,1732],{"type":10,"tag":239,"props":1636,"children":1637},{"class":241,"line":242},[1638,1643,1648],{"type":10,"tag":239,"props":1639,"children":1640},{"style":257},[1641],{"type":15,"value":1642},"VKAPI_ATTR VkResult VKAPI_CALL ",{"type":10,"tag":239,"props":1644,"children":1645},{"style":811},[1646],{"type":15,"value":1647},"vkGetEncodedVideoSessionParametersKHR",{"type":10,"tag":239,"props":1649,"children":1650},{"style":257},[1651],{"type":15,"value":819},{"type":10,"tag":239,"props":1653,"children":1654},{"class":241,"line":263},[1655,1660,1665],{"type":10,"tag":239,"props":1656,"children":1657},{"style":257},[1658],{"type":15,"value":1659}," VkDevice ",{"type":10,"tag":239,"props":1661,"children":1662},{"style":830},[1663],{"type":15,"value":1664},"device",{"type":10,"tag":239,"props":1666,"children":1667},{"style":257},[1668],{"type":15,"value":838},{"type":10,"tag":239,"props":1670,"children":1671},{"class":241,"line":272},[1672,1676,1681,1685,1690],{"type":10,"tag":239,"props":1673,"children":1674},{"style":246},[1675],{"type":15,"value":278},{"type":10,"tag":239,"props":1677,"children":1678},{"style":257},[1679],{"type":15,"value":1680}," VkVideoEncodeSessionParametersGetInfoKHR",{"type":10,"tag":239,"props":1682,"children":1683},{"style":246},[1684],{"type":15,"value":855},{"type":10,"tag":239,"props":1686,"children":1687},{"style":830},[1688],{"type":15,"value":1689}," pVideoSessionParametersInfo",{"type":10,"tag":239,"props":1691,"children":1692},{"style":257},[1693],{"type":15,"value":838},{"type":10,"tag":239,"props":1695,"children":1696},{"class":241,"line":291},[1697,1702,1706,1711],{"type":10,"tag":239,"props":1698,"children":1699},{"style":257},[1700],{"type":15,"value":1701}," VkVideoEncodeSessionParametersFeedbackInfoKHR",{"type":10,"tag":239,"props":1703,"children":1704},{"style":246},[1705],{"type":15,"value":855},{"type":10,"tag":239,"props":1707,"children":1708},{"style":830},[1709],{"type":15,"value":1710}," pFeedbackInfo",{"type":10,"tag":239,"props":1712,"children":1713},{"style":257},[1714],{"type":15,"value":838},{"type":10,"tag":239,"props":1716,"children":1717},{"class":241,"line":300},[1718,1723,1728],{"type":10,"tag":239,"props":1719,"children":1720},{"style":246},[1721],{"type":15,"value":1722}," size_t*",{"type":10,"tag":239,"props":1724,"children":1725},{"style":830},[1726],{"type":15,"value":1727}," pDataSize",{"type":10,"tag":239,"props":1729,"children":1730},{"style":257},[1731],{"type":15,"value":838},{"type":10,"tag":239,"props":1733,"children":1734},{"class":241,"line":309},[1735,1740,1745],{"type":10,"tag":239,"props":1736,"children":1737},{"style":246},[1738],{"type":15,"value":1739}," void*",{"type":10,"tag":239,"props":1741,"children":1742},{"style":830},[1743],{"type":15,"value":1744}," pData",{"type":10,"tag":239,"props":1746,"children":1747},{"style":257},[1748],{"type":15,"value":865},{"type":10,"tag":11,"props":1750,"children":1751},{},[1752],{"type":15,"value":1753},"The main input to this command is the video session parameters object in question, with layered extensions adding additional chainable structures to provide additional codec-specific input parameters:",{"type":10,"tag":228,"props":1755,"children":1757},{"className":230,"code":1756,"language":232,"meta":233,"style":233},"typedef struct VkVideoEncodeSessionParametersGetInfoKHR {\n VkStructureType sType;\n const void* pNext;\n VkVideoSessionParametersKHR videoSessionParameters;\n} VkVideoEncodeSessionParametersGetInfoKHR;\n",[1758],{"type":10,"tag":89,"props":1759,"children":1760},{"__ignoreMap":233},[1761,1777,1785,1801,1809],{"type":10,"tag":239,"props":1762,"children":1763},{"class":241,"line":242},[1764,1768,1772],{"type":10,"tag":239,"props":1765,"children":1766},{"style":246},[1767],{"type":15,"value":249},{"type":10,"tag":239,"props":1769,"children":1770},{"style":246},[1771],{"type":15,"value":254},{"type":10,"tag":239,"props":1773,"children":1774},{"style":257},[1775],{"type":15,"value":1776}," VkVideoEncodeSessionParametersGetInfoKHR {\n",{"type":10,"tag":239,"props":1778,"children":1779},{"class":241,"line":263},[1780],{"type":10,"tag":239,"props":1781,"children":1782},{"style":257},[1783],{"type":15,"value":1784}," VkStructureType sType;\n",{"type":10,"tag":239,"props":1786,"children":1787},{"class":241,"line":272},[1788,1792,1796],{"type":10,"tag":239,"props":1789,"children":1790},{"style":246},[1791],{"type":15,"value":278},{"type":10,"tag":239,"props":1793,"children":1794},{"style":246},[1795],{"type":15,"value":283},{"type":10,"tag":239,"props":1797,"children":1798},{"style":257},[1799],{"type":15,"value":1800}," pNext;\n",{"type":10,"tag":239,"props":1802,"children":1803},{"class":241,"line":291},[1804],{"type":10,"tag":239,"props":1805,"children":1806},{"style":257},[1807],{"type":15,"value":1808}," VkVideoSessionParametersKHR videoSessionParameters;\n",{"type":10,"tag":239,"props":1810,"children":1811},{"class":241,"line":300},[1812],{"type":10,"tag":239,"props":1813,"children":1814},{"style":257},[1815],{"type":15,"value":1816},"} VkVideoEncodeSessionParametersGetInfoKHR;\n",{"type":10,"tag":11,"props":1818,"children":1819},{},[1820],{"type":15,"value":1821},"This command has multiple purposes.",{"type":10,"tag":11,"props":1823,"children":1824},{},[1825,1827,1832,1833,1839],{"type":15,"value":1826},"First, by providing a non-",{"type":10,"tag":89,"props":1828,"children":1830},{"className":1829},[],[1831],{"type":15,"value":1282},{"type":15,"value":1300},{"type":10,"tag":89,"props":1834,"children":1836},{"className":1835},[],[1837],{"type":15,"value":1838},"pFeedbackInfo",{"type":15,"value":1840}," parameter, the application can get feedback about whether the implementation applied any parameter overrides to the video session parameters in question through the following output structure:",{"type":10,"tag":228,"props":1842,"children":1844},{"className":230,"code":1843,"language":232,"meta":233,"style":233},"typedef struct VkVideoEncodeSessionParametersFeedbackInfoKHR {\n VkStructureType sType;\n void* pNext;\n VkBool32 hasOverrides;\n} VkVideoEncodeSessionParametersFeedbackInfoKHR;\n",[1845],{"type":10,"tag":89,"props":1846,"children":1847},{"__ignoreMap":233},[1848,1864,1872,1884,1892],{"type":10,"tag":239,"props":1849,"children":1850},{"class":241,"line":242},[1851,1855,1859],{"type":10,"tag":239,"props":1852,"children":1853},{"style":246},[1854],{"type":15,"value":249},{"type":10,"tag":239,"props":1856,"children":1857},{"style":246},[1858],{"type":15,"value":254},{"type":10,"tag":239,"props":1860,"children":1861},{"style":257},[1862],{"type":15,"value":1863}," VkVideoEncodeSessionParametersFeedbackInfoKHR {\n",{"type":10,"tag":239,"props":1865,"children":1866},{"class":241,"line":263},[1867],{"type":10,"tag":239,"props":1868,"children":1869},{"style":257},[1870],{"type":15,"value":1871}," VkStructureType sType;\n",{"type":10,"tag":239,"props":1873,"children":1874},{"class":241,"line":272},[1875,1879],{"type":10,"tag":239,"props":1876,"children":1877},{"style":246},[1878],{"type":15,"value":1739},{"type":10,"tag":239,"props":1880,"children":1881},{"style":257},[1882],{"type":15,"value":1883}," pNext;\n",{"type":10,"tag":239,"props":1885,"children":1886},{"class":241,"line":291},[1887],{"type":10,"tag":239,"props":1888,"children":1889},{"style":257},[1890],{"type":15,"value":1891}," VkBool32 hasOverrides;\n",{"type":10,"tag":239,"props":1893,"children":1894},{"class":241,"line":300},[1895],{"type":10,"tag":239,"props":1896,"children":1897},{"style":257},[1898],{"type":15,"value":1899},"} VkVideoEncodeSessionParametersFeedbackInfoKHR;\n",{"type":10,"tag":11,"props":1901,"children":1902},{},[1903,1904,1910,1912,1918],{"type":15,"value":1138},{"type":10,"tag":89,"props":1905,"children":1907},{"className":1906},[],[1908],{"type":15,"value":1909},"hasOverrides",{"type":15,"value":1911}," member will be set to ",{"type":10,"tag":89,"props":1913,"children":1915},{"className":1914},[],[1916],{"type":15,"value":1917},"VK_TRUE",{"type":15,"value":1919}," if implementation overrides were applied, and layered extensions may provide additional chainable output structures that return further (typically codec-specific) information about the applied overrides.",{"type":10,"tag":11,"props":1921,"children":1922},{},[1923,1925,1930,1931,1937,1939,1944,1945,1951],{"type":15,"value":1924},"When this feedback indicates that implementation overrides were applied, the application needs to retrieve the encoded video session parameters containing the overrides in order to be able to produce a compliant bitstream. This can be done in the usual fashion by providing a non-",{"type":10,"tag":89,"props":1926,"children":1928},{"className":1927},[],[1929],{"type":15,"value":1282},{"type":15,"value":1300},{"type":10,"tag":89,"props":1932,"children":1934},{"className":1933},[],[1935],{"type":15,"value":1936},"pDataSize",{"type":15,"value":1938}," parameter to retrieve the size of the encoded parameter data, and then calling the command again with a non-",{"type":10,"tag":89,"props":1940,"children":1942},{"className":1941},[],[1943],{"type":15,"value":1282},{"type":15,"value":1300},{"type":10,"tag":89,"props":1946,"children":1948},{"className":1947},[],[1949],{"type":15,"value":1950},"pData",{"type":15,"value":1952}," pointer to retrieve the data.",{"type":10,"tag":11,"props":1954,"children":1955},{},[1956,1958,1963],{"type":15,"value":1957},"The application can choose to use the ",{"type":10,"tag":89,"props":1959,"children":1961},{"className":1960},[],[1962],{"type":15,"value":1647},{"type":15,"value":1964}," command to encode the video session parameters even if the implementation did not override any of the parameters, but in this case it can also choose to encode the respective bitstream elements on its own.",{"type":10,"tag":11,"props":1966,"children":1967},{},[1968],{"type":15,"value":1969},"It is worth calling out though that if the application does not use this command to determine whether video session parameter overrides happened or does not use the encoded parameters retrievable using this command when video session parameter overrides happened, but rather just encodes the respective bitstream elements with its own choice of codec-specific parameters, then it risks the resulting video bitstream to end up being non-compliant with the video compression standard.",{"type":10,"tag":116,"props":1971,"children":1973},{"id":1972},"_capabilities",[1974],{"type":15,"value":1975},"Capabilities",{"type":10,"tag":11,"props":1977,"children":1978},{},[1979,1981,1986],{"type":15,"value":1980},"Querying capabilities specific to video encoding happens through the query mechanisms introduced by the ",{"type":10,"tag":89,"props":1982,"children":1984},{"className":1983},[],[1985],{"type":15,"value":94},{"type":15,"value":1987}," extension.",{"type":10,"tag":11,"props":1989,"children":1990},{},[1991,1993,1998],{"type":15,"value":1992},"Support for individual video encode operations can be retrieved for each queue family using the ",{"type":10,"tag":89,"props":1994,"children":1996},{"className":1995},[],[1997],{"type":15,"value":152},{"type":15,"value":1999}," structure, as discussed earlier.",{"type":10,"tag":11,"props":2001,"children":2002},{},[2003,2005,2011,2013,2018,2020,2026],{"type":15,"value":2004},"The application can also use the ",{"type":10,"tag":89,"props":2006,"children":2008},{"className":2007},[],[2009],{"type":15,"value":2010},"vkGetPhysicalDeviceVideoCapabilitiesKHR",{"type":15,"value":2012}," command to query the capabilities of a specific video encode profile. In case of video encode profiles, the following new structure has to be included in the ",{"type":10,"tag":89,"props":2014,"children":2016},{"className":2015},[],[2017],{"type":15,"value":701},{"type":15,"value":2019}," chain of the ",{"type":10,"tag":89,"props":2021,"children":2023},{"className":2022},[],[2024],{"type":15,"value":2025},"VkVideoCapabilitiesKHR",{"type":15,"value":2027}," structure used to retrieve the general video encode capabilities:",{"type":10,"tag":228,"props":2029,"children":2031},{"className":230,"code":2030,"language":232,"meta":233,"style":233},"typedef struct VkVideoEncodeCapabilitiesKHR {\n VkStructureType sType;\n void* pNext;\n VkVideoEncodeCapabilityFlagsKHR flags;\n VkVideoEncodeRateControlModeFlagsKHR rateControlModes;\n uint32_t maxRateControlLayers;\n uint64_t maxBitrate;\n uint32_t maxQualityLevels;\n VkExtent2D encodeInputPictureGranularity;\n VkVideoEncodeFeedbackFlagsKHR supportedEncodeFeedbackFlags;\n} VkVideoEncodeCapabilitiesKHR;\n",[2032],{"type":10,"tag":89,"props":2033,"children":2034},{"__ignoreMap":233},[2035,2051,2059,2071,2079,2087,2099,2112,2124,2132,2140],{"type":10,"tag":239,"props":2036,"children":2037},{"class":241,"line":242},[2038,2042,2046],{"type":10,"tag":239,"props":2039,"children":2040},{"style":246},[2041],{"type":15,"value":249},{"type":10,"tag":239,"props":2043,"children":2044},{"style":246},[2045],{"type":15,"value":254},{"type":10,"tag":239,"props":2047,"children":2048},{"style":257},[2049],{"type":15,"value":2050}," VkVideoEncodeCapabilitiesKHR {\n",{"type":10,"tag":239,"props":2052,"children":2053},{"class":241,"line":263},[2054],{"type":10,"tag":239,"props":2055,"children":2056},{"style":257},[2057],{"type":15,"value":2058}," VkStructureType 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rateControlModes;\n",{"type":10,"tag":239,"props":2088,"children":2089},{"class":241,"line":309},[2090,2094],{"type":10,"tag":239,"props":2091,"children":2092},{"style":246},[2093],{"type":15,"value":989},{"type":10,"tag":239,"props":2095,"children":2096},{"style":257},[2097],{"type":15,"value":2098}," maxRateControlLayers;\n",{"type":10,"tag":239,"props":2100,"children":2101},{"class":241,"line":318},[2102,2107],{"type":10,"tag":239,"props":2103,"children":2104},{"style":246},[2105],{"type":15,"value":2106}," uint64_t",{"type":10,"tag":239,"props":2108,"children":2109},{"style":257},[2110],{"type":15,"value":2111}," maxBitrate;\n",{"type":10,"tag":239,"props":2113,"children":2114},{"class":241,"line":952},[2115,2119],{"type":10,"tag":239,"props":2116,"children":2117},{"style":246},[2118],{"type":15,"value":989},{"type":10,"tag":239,"props":2120,"children":2121},{"style":257},[2122],{"type":15,"value":2123}," maxQualityLevels;\n",{"type":10,"tag":239,"props":2125,"children":2126},{"class":241,"line":961},[2127],{"type":10,"tag":239,"props":2128,"children":2129},{"style":257},[2130],{"type":15,"value":2131}," VkExtent2D encodeInputPictureGranularity;\n",{"type":10,"tag":239,"props":2133,"children":2134},{"class":241,"line":983},[2135],{"type":10,"tag":239,"props":2136,"children":2137},{"style":257},[2138],{"type":15,"value":2139}," VkVideoEncodeFeedbackFlagsKHR supportedEncodeFeedbackFlags;\n",{"type":10,"tag":239,"props":2141,"children":2142},{"class":241,"line":997},[2143],{"type":10,"tag":239,"props":2144,"children":2145},{"style":257},[2146],{"type":15,"value":2147},"} VkVideoEncodeCapabilitiesKHR;\n",{"type":10,"tag":11,"props":2149,"children":2150},{},[2151,2153,2159,2161,2166],{"type":15,"value":2152},"This structure contains a new encode-specific ",{"type":10,"tag":89,"props":2154,"children":2156},{"className":2155},[],[2157],{"type":15,"value":2158},"flags",{"type":15,"value":2160}," member that indicates support for various video encode capabilities, like the support for the ",{"type":10,"tag":89,"props":2162,"children":2164},{"className":2163},[],[2165],{"type":15,"value":1170},{"type":15,"value":2167}," parameter discussed before.",{"type":10,"tag":11,"props":2169,"children":2170},{},[2171,2172,2178,2180,2186],{"type":15,"value":1138},{"type":10,"tag":89,"props":2173,"children":2175},{"className":2174},[],[2176],{"type":15,"value":2177},"rateControlModes",{"type":15,"value":2179}," and ",{"type":10,"tag":89,"props":2181,"children":2183},{"className":2182},[],[2184],{"type":15,"value":2185},"maxRateControlLayers",{"type":15,"value":2187}," members provide information about the supported rate control modes and maximum number of rate control layers that can be used in a video session, as discussed later.",{"type":10,"tag":11,"props":2189,"children":2190},{},[2191,2192,2198],{"type":15,"value":1138},{"type":10,"tag":89,"props":2193,"children":2195},{"className":2194},[],[2196],{"type":15,"value":2197},"maxBitrate",{"type":15,"value":2199}," member provides information about the maximum bitrate supported for the video profile.",{"type":10,"tag":11,"props":2201,"children":2202},{},[2203,2204,2210,2212,2218],{"type":15,"value":1138},{"type":10,"tag":89,"props":2205,"children":2207},{"className":2206},[],[2208],{"type":15,"value":2209},"maxQualityLevels",{"type":15,"value":2211}," member specifies the number of different video encode quality level values supported by the video encode profile in question which are identified with numbers in the range ",{"type":10,"tag":89,"props":2213,"children":2215},{"className":2214},[],[2216],{"type":15,"value":2217},"0..maxQualityLevels",{"type":15,"value":2219},". The number and implementation effect of the quality levels is expected to vary across video encode profiles, even in video encode profiles using the same video codec operation (e.g. due to the use of different tuning modes), as discussed later.",{"type":10,"tag":11,"props":2221,"children":2222},{},[2223,2224,2230,2232,2238],{"type":15,"value":1138},{"type":10,"tag":89,"props":2225,"children":2227},{"className":2226},[],[2228],{"type":15,"value":2229},"encodeInputPictureGranularity",{"type":15,"value":2231}," member indicates the granularity at which data from the encode input picture is used for encoding individual codec-specific coding blocks. If this capability is not ",{"type":10,"tag":89,"props":2233,"children":2235},{"className":2234},[],[2236],{"type":15,"value":2237},"{1,1}",{"type":15,"value":2239},", then it is recommend for applications to initialize the data in the encode input picture at this granularity, as the encoder will use data in such padding texels during the encoding, which may affect the quality and efficiency of the encoding.",{"type":10,"tag":11,"props":2241,"children":2242},{},[2243,2244,2250,2252,2257],{"type":15,"value":1138},{"type":10,"tag":89,"props":2245,"children":2247},{"className":2246},[],[2248],{"type":15,"value":2249},"supportedEncodeFeedbackFlags",{"type":15,"value":2251}," member indicates the set of supported encode feedback flags for the ",{"type":10,"tag":89,"props":2253,"children":2255},{"className":2254},[],[2256],{"type":15,"value":1068},{"type":15,"value":2258}," queries described later.",{"type":10,"tag":11,"props":2260,"children":2261},{},[2262,2263,2268,2270,2275],{"type":15,"value":1138},{"type":10,"tag":89,"props":2264,"children":2266},{"className":2265},[],[2267],{"type":15,"value":758},{"type":15,"value":2269}," command can be used to query the supported image/picture formats for a given set of video profiles, as described in the ",{"type":10,"tag":89,"props":2271,"children":2273},{"className":2272},[],[2274],{"type":15,"value":94},{"type":15,"value":1987},{"type":10,"tag":11,"props":2277,"children":2278},{},[2279,2281,2286,2288,2294],{"type":15,"value":2280},"In particular, if the application would like to query the list of format properties supported for encode input pictures, then it should include the new ",{"type":10,"tag":89,"props":2282,"children":2284},{"className":2283},[],[2285],{"type":15,"value":659},{"type":15,"value":2287}," usage flag in ",{"type":10,"tag":89,"props":2289,"children":2291},{"className":2290},[],[2292],{"type":15,"value":2293},"VkPhysicalDeviceVideoFormatInfoKHR::imageUsage",{"type":15,"value":2295},".",{"type":10,"tag":11,"props":2297,"children":2298},{},[2299,2301,2306,2307,2312],{"type":15,"value":2300},"Similarly, to query the list of format properties supported for encode DPB pictures (reconstructed/reference pictures), then it should include the new ",{"type":10,"tag":89,"props":2302,"children":2304},{"className":2303},[],[2305],{"type":15,"value":680},{"type":15,"value":2287},{"type":10,"tag":89,"props":2308,"children":2310},{"className":2309},[],[2311],{"type":15,"value":2293},{"type":15,"value":2295},{"type":10,"tag":116,"props":2314,"children":2316},{"id":2315},"_video_encode_quality_levels",[2317],{"type":15,"value":2318},"Video Encode Quality Levels",{"type":10,"tag":11,"props":2320,"children":2321},{},[2322],{"type":15,"value":2323},"This proposal introduces the concept of video encode quality levels, which can be thought of as encoder presets that control the number and type of implementation-specific encoding tools and algorithms utilized in the encoding process. Implementations can expose support for one or more such video encode quality levels for each video profile. By default, video encode quality level index zero is used, unless otherwise specified.",{"type":10,"tag":11,"props":2325,"children":2326},{},[2327],{"type":15,"value":2328},"Generally, using higher video encode quality levels may produce higher quality video streams at the cost of additional processing time. However, as the final quality of an encoded picture depends on the contents of the encode input picture, the contents of the active reference pictures, the codec-specific encode parameters, and the particular implementation-specific tools used corresponding to the individual video encode quality levels, there are no guarantees that using a higher video encode quality level will always produce a higher quality encoded picture for any given set of inputs.",{"type":10,"tag":11,"props":2330,"children":2331},{},[2332,2334,2339,2341,2346,2347,2353],{"type":15,"value":2333},"The chosen quality level may also affect the optimization overrides applied by implementations when using the ",{"type":10,"tag":89,"props":2335,"children":2337},{"className":2336},[],[2338],{"type":15,"value":1574},{"type":15,"value":2340}," flag, and thus codec-specific parameters stored in video session parameters may be affected by the used video encode quality level. As such, video session parameters objects are always created with respect to a specific video encode quality level. The application can choose to create a video session parameters object with a video encode quality level index different than the default quality level of zero by including the following new structure in the ",{"type":10,"tag":89,"props":2342,"children":2344},{"className":2343},[],[2345],{"type":15,"value":701},{"type":15,"value":1382},{"type":10,"tag":89,"props":2348,"children":2350},{"className":2349},[],[2351],{"type":15,"value":2352},"VkVideoSessionParametersCreateInfoKHR",{"type":15,"value":226},{"type":10,"tag":228,"props":2355,"children":2357},{"className":230,"code":2356,"language":232,"meta":233,"style":233},"typedef struct VkVideoEncodeQualityLevelInfoKHR {\n VkStructureType sType;\n const void* pNext;\n uint32_t qualityLevel;\n} VkVideoEncodeQualityLevelInfoKHR;\n",[2358],{"type":10,"tag":89,"props":2359,"children":2360},{"__ignoreMap":233},[2361,2377,2384,2400,2412],{"type":10,"tag":239,"props":2362,"children":2363},{"class":241,"line":242},[2364,2368,2372],{"type":10,"tag":239,"props":2365,"children":2366},{"style":246},[2367],{"type":15,"value":249},{"type":10,"tag":239,"props":2369,"children":2370},{"style":246},[2371],{"type":15,"value":254},{"type":10,"tag":239,"props":2373,"children":2374},{"style":257},[2375],{"type":15,"value":2376}," VkVideoEncodeQualityLevelInfoKHR {\n",{"type":10,"tag":239,"props":2378,"children":2379},{"class":241,"line":263},[2380],{"type":10,"tag":239,"props":2381,"children":2382},{"style":257},[2383],{"type":15,"value":1871},{"type":10,"tag":239,"props":2385,"children":2386},{"class":241,"line":272},[2387,2391,2395],{"type":10,"tag":239,"props":2388,"children":2389},{"style":246},[2390],{"type":15,"value":278},{"type":10,"tag":239,"props":2392,"children":2393},{"style":246},[2394],{"type":15,"value":283},{"type":10,"tag":239,"props":2396,"children":2397},{"style":257},[2398],{"type":15,"value":2399}," pNext;\n",{"type":10,"tag":239,"props":2401,"children":2402},{"class":241,"line":291},[2403,2407],{"type":10,"tag":239,"props":2404,"children":2405},{"style":246},[2406],{"type":15,"value":989},{"type":10,"tag":239,"props":2408,"children":2409},{"style":257},[2410],{"type":15,"value":2411}," qualityLevel;\n",{"type":10,"tag":239,"props":2413,"children":2414},{"class":241,"line":300},[2415],{"type":10,"tag":239,"props":2416,"children":2417},{"style":257},[2418],{"type":15,"value":2419},"} VkVideoEncodeQualityLevelInfoKHR;\n",{"type":10,"tag":11,"props":2421,"children":2422},{},[2423,2425,2431],{"type":15,"value":2424},"Where ",{"type":10,"tag":89,"props":2426,"children":2428},{"className":2427},[],[2429],{"type":15,"value":2430},"qualityLevel",{"type":15,"value":2432}," specifies the used video encode quality level.",{"type":10,"tag":11,"props":2434,"children":2435},{},[2436,2438,2444,2446,2451,2453,2459,2461,2467,2469,2475,2476,2482],{"type":15,"value":2437},"Video sessions created against a video encode profile allow changing the used video encode quality level dynamically. After creation, the video session is configured with the default quality level of zero, which then can be changed by including the new ",{"type":10,"tag":89,"props":2439,"children":2441},{"className":2440},[],[2442],{"type":15,"value":2443},"VK_VIDEO_CODING_CONTROL_ENCODE_QUALITY_LEVEL_BIT_KHR",{"type":15,"value":2445}," flag in the ",{"type":10,"tag":89,"props":2447,"children":2449},{"className":2448},[],[2450],{"type":15,"value":2158},{"type":15,"value":2452}," member of the ",{"type":10,"tag":89,"props":2454,"children":2456},{"className":2455},[],[2457],{"type":15,"value":2458},"VkVideoCodingControlInfoKHR",{"type":15,"value":2460}," structure passed to the ",{"type":10,"tag":89,"props":2462,"children":2464},{"className":2463},[],[2465],{"type":15,"value":2466},"vkCmdControlVideoCodingKHR",{"type":15,"value":2468}," command and including an instance of the ",{"type":10,"tag":89,"props":2470,"children":2472},{"className":2471},[],[2473],{"type":15,"value":2474},"VkVideoEncodeQualityLevelInfoKHR",{"type":15,"value":695},{"type":10,"tag":89,"props":2477,"children":2479},{"className":2478},[],[2480],{"type":15,"value":2481},"VkVideoCodingControlInfoKHR::pNext",{"type":15,"value":2483}," chain specifying the new quality level to set for the video session.",{"type":10,"tag":11,"props":2485,"children":2486},{},[2487],{"type":15,"value":2488},"If video session parameters objects are used by a particular video encode command, then the video encode quality the parameters object was created with has to match the currently configured quality level for the bound video session.",{"type":10,"tag":11,"props":2490,"children":2491},{},[2492],{"type":15,"value":2493},"Implementations may have certain recommendations for encoding parameters and configuration (e.g. for rate control) specific to each supported video encode quality level. These recommendations and other quality level related properties can be queried for a specific video encode profile using the following new command:",{"type":10,"tag":228,"props":2495,"children":2497},{"className":230,"code":2496,"language":232,"meta":233,"style":233},"VKAPI_ATTR VkResult VKAPI_CALL vkGetPhysicalDeviceVideoEncodeQualityLevelPropertiesKHR(\n VkPhysicalDevice physicalDevice,\n const VkPhysicalDeviceVideoEncodeQualityLevelInfoKHR* pQualityLevelInfo,\n VkVideoEncodeQualityLevelPropertiesKHR* pQualityLevelProperties);\n",[2498],{"type":10,"tag":89,"props":2499,"children":2500},{"__ignoreMap":233},[2501,2516,2533,2558],{"type":10,"tag":239,"props":2502,"children":2503},{"class":241,"line":242},[2504,2508,2512],{"type":10,"tag":239,"props":2505,"children":2506},{"style":257},[2507],{"type":15,"value":1642},{"type":10,"tag":239,"props":2509,"children":2510},{"style":811},[2511],{"type":15,"value":546},{"type":10,"tag":239,"props":2513,"children":2514},{"style":257},[2515],{"type":15,"value":819},{"type":10,"tag":239,"props":2517,"children":2518},{"class":241,"line":263},[2519,2524,2529],{"type":10,"tag":239,"props":2520,"children":2521},{"style":257},[2522],{"type":15,"value":2523}," VkPhysicalDevice 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Rate control layers can only be specified when rate control is not disabled or is not set to the implementation-specific defaults.",{"type":10,"tag":11,"props":3201,"children":3202},{},[3203,3209,3210,3216],{"type":10,"tag":89,"props":3204,"children":3206},{"className":3205},[],[3207],{"type":15,"value":3208},"virtualBufferSizeInMs",{"type":15,"value":2179},{"type":10,"tag":89,"props":3211,"children":3213},{"className":3212},[],[3214],{"type":15,"value":3215},"initialVirtualBufferSizeInMs",{"type":15,"value":3217}," specify the size and initial occupancy, respectively, in milliseconds of the leaky bucket model virtual buffer.",{"type":10,"tag":11,"props":3219,"children":3220},{},[3221,3222,3228],{"type":15,"value":1138},{"type":10,"tag":89,"props":3223,"children":3225},{"className":3224},[],[3226],{"type":15,"value":3227},"VkVideoEncodeRateControlLayerInfoKHR",{"type":15,"value":3229}," structure is defined as follows:",{"type":10,"tag":228,"props":3231,"children":3233},{"className":230,"code":3232,"language":232,"meta":233,"style":233},"typedef struct VkVideoEncodeRateControlLayerInfoKHR {\n VkStructureType sType;\n const void* pNext;\n uint64_t averageBitrate;\n uint64_t maxBitrate;\n uint32_t frameRateNumerator;\n uint32_t frameRateDenominator;\n} VkVideoEncodeRateControlLayerInfoKHR;\n",[3234],{"type":10,"tag":89,"props":3235,"children":3236},{"__ignoreMap":233},[3237,3253,3260,3275,3287,3299,3311,3323],{"type":10,"tag":239,"props":3238,"children":3239},{"class":241,"line":242},[3240,3244,3248],{"type":10,"tag":239,"props":3241,"children":3242},{"style":246},[3243],{"type":15,"value":249},{"type":10,"tag":239,"props":3245,"children":3246},{"style":246},[3247],{"type":15,"value":254},{"type":10,"tag":239,"props":3249,"children":3250},{"style":257},[3251],{"type":15,"value":3252}," VkVideoEncodeRateControlLayerInfoKHR {\n",{"type":10,"tag":239,"props":3254,"children":3255},{"class":241,"line":263},[3256],{"type":10,"tag":239,"props":3257,"children":3258},{"style":257},[3259],{"type":15,"value":1871},{"type":10,"tag":239,"props":3261,"children":3262},{"class":241,"line":272},[3263,3267,3271],{"type":10,"tag":239,"props":3264,"children":3265},{"style":246},[3266],{"type":15,"value":278},{"type":10,"tag":239,"props":3268,"children":3269},{"style":246},[3270],{"type":15,"value":283},{"type":10,"tag":239,"props":3272,"children":3273},{"style":257},[3274],{"type":15,"value":2399},{"type":10,"tag":239,"props":3276,"children":3277},{"class":241,"line":291},[3278,3282],{"type":10,"tag":239,"props":3279,"children":3280},{"style":246},[3281],{"type":15,"value":2106},{"type":10,"tag":239,"props":3283,"children":3284},{"style":257},[3285],{"type":15,"value":3286}," averageBitrate;\n",{"type":10,"tag":239,"props":3288,"children":3289},{"class":241,"line":300},[3290,3294],{"type":10,"tag":239,"props":3291,"children":3292},{"style":246},[3293],{"type":15,"value":2106},{"type":10,"tag":239,"props":3295,"children":3296},{"style":257},[3297],{"type":15,"value":3298}," maxBitrate;\n",{"type":10,"tag":239,"props":3300,"children":3301},{"class":241,"line":309},[3302,3306],{"type":10,"tag":239,"props":3303,"children":3304},{"style":246},[3305],{"type":15,"value":989},{"type":10,"tag":239,"props":3307,"children":3308},{"style":257},[3309],{"type":15,"value":3310}," frameRateNumerator;\n",{"type":10,"tag":239,"props":3312,"children":3313},{"class":241,"line":318},[3314,3318],{"type":10,"tag":239,"props":3315,"children":3316},{"style":246},[3317],{"type":15,"value":989},{"type":10,"tag":239,"props":3319,"children":3320},{"style":257},[3321],{"type":15,"value":3322}," frameRateDenominator;\n",{"type":10,"tag":239,"props":3324,"children":3325},{"class":241,"line":952},[3326],{"type":10,"tag":239,"props":3327,"children":3328},{"style":257},[3329],{"type":15,"value":3330},"} VkVideoEncodeRateControlLayerInfoKHR;\n",{"type":10,"tag":11,"props":3332,"children":3333},{},[3334,3340,3341,3346],{"type":10,"tag":89,"props":3335,"children":3337},{"className":3336},[],[3338],{"type":15,"value":3339},"averageBitrate",{"type":15,"value":2179},{"type":10,"tag":89,"props":3342,"children":3344},{"className":3343},[],[3345],{"type":15,"value":2197},{"type":15,"value":3347}," specify the target and peak bitrate that the rate control layer should use in bits/second. In case of CBR mode the two values have to match.",{"type":10,"tag":11,"props":3349,"children":3350},{},[3351,3357,3358,3364],{"type":10,"tag":89,"props":3352,"children":3354},{"className":3353},[],[3355],{"type":15,"value":3356},"frameRateNumerator",{"type":15,"value":2179},{"type":10,"tag":89,"props":3359,"children":3361},{"className":3360},[],[3362],{"type":15,"value":3363},"frameRateDenominator",{"type":15,"value":3365}," specify the numerator and denominator of the frame rate used by the video sequence.",{"type":10,"tag":11,"props":3367,"children":3368},{},[3369],{"type":15,"value":3370},"The exact behavior of rate control is implementation-specific but it is typically constrained by the video compression standard corresponding to the used video profile. Implementations are expected to implement rate control as follows:",{"type":10,"tag":29,"props":3372,"children":3373},{},[3374,3386],{"type":10,"tag":33,"props":3375,"children":3376},{},[3377,3379,3384],{"type":15,"value":3378},"In case of CBR mode the bitrate should stay as close to the specified ",{"type":10,"tag":89,"props":3380,"children":3382},{"className":3381},[],[3383],{"type":15,"value":3339},{"type":15,"value":3385}," as possible within the virtual buffer window.",{"type":10,"tag":33,"props":3387,"children":3388},{},[3389,3391,3396,3398,3403],{"type":15,"value":3390},"In case of VBR mode the bitrate should not exceed the value of ",{"type":10,"tag":89,"props":3392,"children":3394},{"className":3393},[],[3395],{"type":15,"value":2197},{"type":15,"value":3397}," while also trying to get close to the target bitrate specified by ",{"type":10,"tag":89,"props":3399,"children":3401},{"className":3400},[],[3402],{"type":15,"value":3339},{"type":15,"value":3404}," within the virtual buffer window.",{"type":10,"tag":11,"props":3406,"children":3407},{},[3408,3410,3416,3417,3422],{"type":15,"value":3409},"Codec-specific video encode extensions can include both global and per-layer codec-specific rate control configurations by chaining codec-specific parameters to the ",{"type":10,"tag":89,"props":3411,"children":3413},{"className":3412},[],[3414],{"type":15,"value":3415},"VkVideoEncodeRateControlInfoKHR",{"type":15,"value":2179},{"type":10,"tag":89,"props":3418,"children":3420},{"className":3419},[],[3421],{"type":15,"value":3227},{"type":15,"value":3423}," structures, respectively.",{"type":10,"tag":11,"props":3425,"children":3426},{},[3427,3429,3435,3437,3442,3444,3449,3450,3456,3458,3463],{"type":15,"value":3428},"Some implementations do not track the current rate control configuration as part of the device state maintained in the video session object, but the current rate control configuration may affect the device commands recorded in response to video encode operations. In order to enable implementations to have access to the current rate control configuration when recording video encoding commands into command buffers, this proposal requires the current rate control configuration to be also specified when calling ",{"type":10,"tag":89,"props":3430,"children":3432},{"className":3431},[],[3433],{"type":15,"value":3434},"vkCmdBeginVideoCodingKHR",{"type":15,"value":3436}," by including the ",{"type":10,"tag":89,"props":3438,"children":3440},{"className":3439},[],[3441],{"type":15,"value":3415},{"type":15,"value":3443}," structure describing it in the ",{"type":10,"tag":89,"props":3445,"children":3447},{"className":3446},[],[3448],{"type":15,"value":701},{"type":15,"value":2019},{"type":10,"tag":89,"props":3451,"children":3453},{"className":3452},[],[3454],{"type":15,"value":3455},"pBeginCodingInfo",{"type":15,"value":3457}," parameter. When this information is not included, it is assumed that the currently expected rate control configuration is the default one, i.e. the implementation-specific rate control mode indicated by ",{"type":10,"tag":89,"props":3459,"children":3461},{"className":3460},[],[3462],{"type":15,"value":2980},{"type":15,"value":2295},{"type":10,"tag":11,"props":3465,"children":3466},{},[3467,3469,3474,3476,3481,3483,3488,3490,3495],{"type":15,"value":3468},"It is important to note that specifying the rate control configuration when calling ",{"type":10,"tag":89,"props":3470,"children":3472},{"className":3471},[],[3473],{"type":15,"value":3434},{"type":15,"value":3475}," does not change the current rate control configuration. For that the ",{"type":10,"tag":89,"props":3477,"children":3479},{"className":3478},[],[3480],{"type":15,"value":2466},{"type":15,"value":3482}," command must be used with the ",{"type":10,"tag":89,"props":3484,"children":3486},{"className":3485},[],[3487],{"type":15,"value":3026},{"type":15,"value":3489}," flag, as discussed earlier. The rate control configuration specified to ",{"type":10,"tag":89,"props":3491,"children":3493},{"className":3492},[],[3494],{"type":15,"value":3434},{"type":15,"value":3496}," serves only to make the information about the current rate control state available to implementations during command recording and is expected to always match the effective current rate control state at the time the command is executed on the device.",{"type":10,"tag":116,"props":3498,"children":3500},{"id":3499},"_usage_summary",[3501],{"type":15,"value":3502},"Usage Summary",{"type":10,"tag":11,"props":3504,"children":3505},{},[3506],{"type":15,"value":3507},"To summarize the usage of the video encoding features introduced by this extension, let us take a look at a typical usage scenario when using this extension to encode a video stream.",{"type":10,"tag":11,"props":3509,"children":3510},{},[3511],{"type":15,"value":3512},"Before the application can start recording command buffers with video encode operations, it has to do the following:",{"type":10,"tag":65,"props":3514,"children":3515},{},[3516,3536,3556,3568,3580,3592,3597,3602,3614,3619,3624],{"type":10,"tag":33,"props":3517,"children":3518},{},[3519,3521,3527,3529,3534],{"type":15,"value":3520},"Ensure that the implementation can encode the video content by first querying the video codec operations supported by each queue family using the ",{"type":10,"tag":89,"props":3522,"children":3524},{"className":3523},[],[3525],{"type":15,"value":3526},"vkGetPhysicalDeviceQueueFamilyProperties2",{"type":15,"value":3528}," command and the ",{"type":10,"tag":89,"props":3530,"children":3532},{"className":3531},[],[3533],{"type":15,"value":152},{"type":15,"value":3535}," output structure.",{"type":10,"tag":33,"props":3537,"children":3538},{},[3539,3541,3547,3549,3554],{"type":15,"value":3540},"If needed, the application has to also retrieve the ",{"type":10,"tag":89,"props":3542,"children":3544},{"className":3543},[],[3545],{"type":15,"value":3546},"VkQueueFamilyQueryResultStatusPropertiesKHR",{"type":15,"value":3548}," output structure for the queue family to check support for ",{"type":10,"tag":89,"props":3550,"children":3552},{"className":3551},[],[3553],{"type":15,"value":1048},{"type":15,"value":3555}," queries.",{"type":10,"tag":33,"props":3557,"children":3558},{},[3559,3561,3566],{"type":15,"value":3560},"Construct the ",{"type":10,"tag":89,"props":3562,"children":3564},{"className":3563},[],[3565],{"type":15,"value":204},{"type":15,"value":3567}," structure describing the entire video profile, including the video codec operation, chroma subsampling, bit depths, and any other usage or codec-specific parameters.",{"type":10,"tag":33,"props":3569,"children":3570},{},[3571,3573,3578],{"type":15,"value":3572},"Ensure that the specific video profile is supported by the implementation using the ",{"type":10,"tag":89,"props":3574,"children":3576},{"className":3575},[],[3577],{"type":15,"value":2010},{"type":15,"value":3579}," command and retrieve the general, encode-specific, and codec-specific capabilities at the same time.",{"type":10,"tag":33,"props":3581,"children":3582},{},[3583,3585,3590],{"type":15,"value":3584},"Query the list of supported image/picture format properties supported for the video profile using the ",{"type":10,"tag":89,"props":3586,"children":3588},{"className":3587},[],[3589],{"type":15,"value":758},{"type":15,"value":3591}," structure, and select a suitable format for the DPB and encode input pictures.",{"type":10,"tag":33,"props":3593,"children":3594},{},[3595],{"type":15,"value":3596},"Create an image corresponding to the encode input picture with the appropriate usage flags and video profile list, as described earlier, and bind suitable device memory to the image. Also create an image view with the appropriate usage flags to use in the video encode operations.",{"type":10,"tag":33,"props":3598,"children":3599},{},[3600],{"type":15,"value":3601},"If needed, create one or more images corresponding to the DPB pictures with the appropriate usage flags and video profile list, as described earlier, and bind suitable device memory to them. Also create any image views with the appropriate usage flags to use in the video encode operations.",{"type":10,"tag":33,"props":3603,"children":3604},{},[3605,3607,3612],{"type":15,"value":3606},"Create a buffer with the ",{"type":10,"tag":89,"props":3608,"children":3610},{"className":3609},[],[3611],{"type":15,"value":640},{"type":15,"value":3613}," usage flag and the video profile list, to use as the destination video bitstream buffer. If the buffer is expected to be consumed using the CPU, consider binding compatible host-visible device memory to the buffer.",{"type":10,"tag":33,"props":3615,"children":3616},{},[3617],{"type":15,"value":3618},"If result status or video encode feedback queries are needed and supported (as determined earlier), create a query pool with the corresponding query type and the used video encode profile.",{"type":10,"tag":33,"props":3620,"children":3621},{},[3622],{"type":15,"value":3623},"Create the video session using the video encode profile and appropriate parameters within the capabilities supported by the profile, as determined earlier. 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What about field encoding, slice encoding, etc.?",{"type":10,"tag":11,"props":13091,"children":13092},{},[13093,13095,13100],{"type":15,"value":13094},"This extension does not define the types of pictures or sub-picture content that can be encoded by a ",{"type":10,"tag":89,"props":13096,"children":13098},{"className":13097},[],[13099],{"type":15,"value":13087},{"type":15,"value":13101}," command. It is expected that the codec-specific encode extensions built upon this extension define the types of pictures that can be encoded. Furthermore, both codec-specific and codec-independent extensions can expand the set of capabilities introduced here to enable more advanced use cases, as needed.",{"type":10,"tag":116,"props":13103,"children":13105},{"id":13104},"_resolved_what_is_the_effect_of_the_flags_provided_in_vkvideoencodeusageinfokhrvideousagehints_and_vkvideoencodeusageinfokhrvideocontenthints",[13106,13108,13114,13115,13121],{"type":15,"value":13107},"RESOLVED: What is the effect of the flags provided in ",{"type":10,"tag":89,"props":13109,"children":13111},{"className":13110},[],[13112],{"type":15,"value":13113},"VkVideoEncodeUsageInfoKHR::videoUsageHints",{"type":15,"value":2179},{"type":10,"tag":89,"props":13116,"children":13118},{"className":13117},[],[13119],{"type":15,"value":13120},"VkVideoEncodeUsageInfoKHR::videoContentHints",{"type":15,"value":12977},{"type":10,"tag":11,"props":13123,"children":13124},{},[13125],{"type":15,"value":13126},"There are no specific behavioral effects associated with any of the video encode usage and content hints, so the application can specify any combination of these flags. They are included to enable the application to better communicate the intended use case scenario to the implementation.",{"type":10,"tag":11,"props":13128,"children":13129},{},[13130,13132,13137,13138,13143,13145,13150,13152,13158,13159,13165,13166,13171,13173,13179,13180,13186,13187,13192],{"type":15,"value":13131},"However, just like any other additional video profile information included in the ",{"type":10,"tag":89,"props":13133,"children":13135},{"className":13134},[],[13136],{"type":15,"value":701},{"type":15,"value":1382},{"type":10,"tag":89,"props":13139,"children":13141},{"className":13140},[],[13142],{"type":15,"value":204},{"type":15,"value":13144}," structures, they are part of the video profile definition, hence whenever matching video profiles have to be provided to an API call, be that queries or resource creation structures, the application must provide identical video encode usage and content hint values. This also applies if the application does not include the ",{"type":10,"tag":89,"props":13146,"children":13148},{"className":13147},[],[13149],{"type":15,"value":438},{"type":15,"value":13151}," structure, which is treated equivalently to specifying the structure with ",{"type":10,"tag":89,"props":13153,"children":13155},{"className":13154},[],[13156],{"type":15,"value":13157},"videoUsageHints",{"type":15,"value":1093},{"type":10,"tag":89,"props":13160,"children":13162},{"className":13161},[],[13163],{"type":15,"value":13164},"videoContentHints",{"type":15,"value":1101},{"type":10,"tag":89,"props":13167,"children":13169},{"className":13168},[],[13170],{"type":15,"value":475},{"type":15,"value":13172}," equal to ",{"type":10,"tag":89,"props":13174,"children":13176},{"className":13175},[],[13177],{"type":15,"value":13178},"VK_VIDEO_ENCODE_USAGE_DEFAULT_KHR",{"type":15,"value":1093},{"type":10,"tag":89,"props":13181,"children":13183},{"className":13182},[],[13184],{"type":15,"value":13185},"VK_VIDEO_ENCODE_CONTENT_DEFAULT_KHR",{"type":15,"value":1101},{"type":10,"tag":89,"props":13188,"children":13190},{"className":13189},[],[13191],{"type":15,"value":489},{"type":15,"value":13193}," (or zero), respectively, per the usual conventions of Vulkan.",{"type":10,"tag":116,"props":13195,"children":13197},{"id":13196},"_resolved_what_is_the_effect_of_the_tuning_mode_provided_in_vkvideoencodeusageinfokhrtuningmode",[13198,13200,13206],{"type":15,"value":13199},"RESOLVED: What is the effect of the tuning mode provided in ",{"type":10,"tag":89,"props":13201,"children":13203},{"className":13202},[],[13204],{"type":15,"value":13205},"VkVideoEncodeUsageInfoKHR::tuningMode",{"type":15,"value":12977},{"type":10,"tag":11,"props":13208,"children":13209},{},[13210,13212,13217],{"type":15,"value":13211},"Unlike the other fields in ",{"type":10,"tag":89,"props":13213,"children":13215},{"className":13214},[],[13216],{"type":15,"value":438},{"type":15,"value":13218},", the tuning mode affects the behavior of video session objects created using them. Different tuning modes may put the hardware in a different mode of operation tuned for the particular use case with significantly different capabilities, as well as quality and performance characteristics.",{"type":10,"tag":116,"props":13220,"children":13222},{"id":13221},"_resolved_how_should_we_expose_video_encoding_feedback_values_e_g_encoded_bitstream_size",[13223],{"type":15,"value":13224},"RESOLVED: How should we expose video encoding feedback values (e.g. encoded bitstream size)?",{"type":10,"tag":11,"props":13226,"children":13227},{},[13228,13230,13235],{"type":15,"value":13229},"Through a new query type. We follow the model of pipeline statistics queries to enable adding additional feedback values to the query thus this extension introduces a new ",{"type":10,"tag":89,"props":13231,"children":13233},{"className":13232},[],[13234],{"type":15,"value":1068},{"type":15,"value":13236}," query type with the ability to get feedback about the offset and size of the bitstream data produced by video encode operations (amongst other feedback values). We expect that in the future video decode operations will need to support similar feedback values thus a similar query type for video decode operations can be introduced by another extension.",{"type":10,"tag":116,"props":13238,"children":13240},{"id":13239},"_resolved_do_result_status_queries_need_to_be_used_in_conjunction_with_video_encode_feedback_queries",[13241],{"type":15,"value":13242},"RESOLVED: Do result status queries need to be used in conjunction with video encode feedback queries?",{"type":10,"tag":11,"props":13244,"children":13245},{},[13246],{"type":15,"value":13247},"No, in fact only a single query can ever be active within a video coding scope, hence executing a result status query as well as a video encode feedback query for the same video encode operation is not possible. Though it is also not needed, as all query types allow returning a result status, just like availability status. Thus, in practice, result status queries are only needed to be used when no other query type is supported in the particular context, and in case of video encoding applications are expected to only use video encode feedback queries within a video coding scope.",{"type":10,"tag":116,"props":13249,"children":13251},{"id":13250},"_resolved_why_is_there_a_need_to_allow_implementations_to_override_codec_specific_parameters",[13252],{"type":15,"value":13253},"RESOLVED: Why is there a need to allow implementations to override codec-specific parameters?",{"type":10,"tag":11,"props":13255,"children":13256},{},[13257],{"type":15,"value":13258},"As described in the corresponding section earlier, encoder implementations usually only support a subset of the available encoding tools defined by the corresponding video compression standards and enumerating exhaustively all of these constraints would be impractical and could result in a combinatorial explosion of codec-specific capabilities. Instead, this proposal allows implementations to override any codec-specific parameter values or combinations thereof, so that the resulting parameters comply to the constraints of the target implementation.",{"type":10,"tag":11,"props":13260,"children":13261},{},[13262],{"type":15,"value":13263},"Some other video encode APIs do not support implementation overrides, but the drawback of that choice is that implementations may not be able to expose a potentially large set of their encoding tools just because they do not comply to the exact wording of the capabilities defined by these APIs, so this proposal chose to maximize the exposed capabilities instead.",{"type":10,"tag":11,"props":13265,"children":13266},{},[13267,13269,13274],{"type":15,"value":13268},"Such minimal and necessary implementation overrides are expected to be applied only when they are absolutely paramount for the correct functioning of the underlying encoder hardware. Additional, optimizing overrides can be, however, explicitly enabled by the application using the ",{"type":10,"tag":89,"props":13270,"children":13272},{"className":13271},[],[13273],{"type":15,"value":1574},{"type":15,"value":13275}," video session creation flag.",{"type":10,"tag":116,"props":13277,"children":13279},{"id":13278},"_resolved_can_the_application_disable_all_implementation_overrides",[13280],{"type":15,"value":13281},"RESOLVED: Can the application disable all implementation overrides?",{"type":10,"tag":11,"props":13283,"children":13284},{},[13285],{"type":15,"value":13286},"No. Without the ability to override codec-specific parameters, as necessitated by the constraints of the target implementation, the implementation may not be able to guarantee that the generated bitstreams will be compliant with the video compression standard in question.",{"type":10,"tag":11,"props":13288,"children":13289},{},[13290],{"type":15,"value":13291},"Accordingly, if the API would allow the application to disable all implementation overrides, that would, for all practical purposes, be equivalent to a flag enabling undefined behavior from the perspective of video compression standard compliance.",{"type":10,"tag":11,"props":13293,"children":13294},{},[13295,13297,13302],{"type":15,"value":13296},"For the same reason, if the application chooses to encode codec-specific parameters stored in video session parameters object on its own, indifferent of whether the implementation had to apply overrides to those, as reported by ",{"type":10,"tag":89,"props":13298,"children":13300},{"className":13299},[],[13301],{"type":15,"value":1647},{"type":15,"value":13303},", it risks the final bitstream to be non-compliant.",{"type":10,"tag":11,"props":13305,"children":13306},{},[13307],{"type":15,"value":13308},"Applications seeking to only accept bitstreams produced exactly according to the codec-specific parameters they requested can choose to treat the presence of any overrides as an encoding error.",{"type":10,"tag":116,"props":13310,"children":13312},{"id":13311},"_resolved_can_implementations_override_any_codec_specific_parameter",[13313],{"type":15,"value":13314},"RESOLVED: Can implementations override any codec-specific parameter?",{"type":10,"tag":11,"props":13316,"children":13317},{},[13318],{"type":15,"value":13319},"No. First, there are a set of rules that implementations have to comply to when applying any parameter overrides, as defined in detail in the specification. In addition, codec-specific extensions layered on top of this proposal can define their own restrictions about what parameters can implementations override. In practice, it is expected that certain codec-specific parameters that affect the overall behavior of the encoder and that could have an impact on any additional bitstream elements that need to be encoded by the application will never be overridden by the implementation, and thus will be excluded from the set of overridable parameters in the corresponding codec-specific extension.",{"type":10,"tag":11,"props":13321,"children":13322},{},[13323],{"type":15,"value":13324},"Over time, it is expected that the set of these guarantees will grow (e.g. by exposing additional capabilities) according to the needs of encoder applications.",{"type":10,"tag":116,"props":13326,"children":13328},{"id":13327},"_resolved_do_all_implementations_have_to_implement_the_same_rate_control_algorithms_corresponding_to_the_rate_control_modes_defined_by_this_proposal",[13329],{"type":15,"value":13330},"RESOLVED: Do all implementations have to implement the same rate control algorithms corresponding to the rate control modes defined by this proposal?",{"type":10,"tag":11,"props":13332,"children":13333},{},[13334],{"type":15,"value":13335},"No. While the high-level rate control modes (CBR and VBR) defined by this proposal are fairly universal, each rate control mode can be implemented in many different ways while still complying to the fundamental model of the mode itself. In practice, the rate control algorithms employed by implementations significantly differ.",{"type":10,"tag":11,"props":13337,"children":13338},{},[13339],{"type":15,"value":13340},"Accordingly, this proposal does not try to describe any specific rate control algorithm for any of the rate control modes introduced, rather it provides a high-level description of the modes and the underlying leaky bucket model used by them.",{"type":10,"tag":11,"props":13342,"children":13343},{},[13344,13346,13351],{"type":15,"value":13345},"The only case where the effects of rate control are defined exactly is when rate control is disabled (using ",{"type":10,"tag":89,"props":13347,"children":13349},{"className":13348},[],[13350],{"type":15,"value":2945},{"type":15,"value":13352},"), where implementations must encode the pictures exactly per the application-specified codec-specific quantization parameters.",{"type":10,"tag":116,"props":13354,"children":13356},{"id":13355},"_resolved_do_rate_control_implementations_guarantee_to_respect_the_averagemax_bitrates_or_frame_sizes_configured_for_the_video_session",[13357],{"type":15,"value":13358},"RESOLVED: Do rate control implementations guarantee to respect the average/max bitrates, or frame sizes configured for the video session?",{"type":10,"tag":11,"props":13360,"children":13361},{},[13362],{"type":15,"value":13363},"Unfortunately, implementations cannot provide hard guarantees about always respecting these rate control parameters, as the ability to conform to these is affected by the input content, the encoder tools of the video compression standard or the implementation, including the contents of future pictures, which implementations cannot make predictions about.",{"type":10,"tag":11,"props":13365,"children":13366},{},[13367],{"type":15,"value":13368},"However, for all practical purposes, these rate control parameters are expected to be respected when the application chooses them in a way that is in line with the encoded content and the characteristics of the used video compression standard.",{"type":10,"tag":116,"props":13370,"children":13372},{"id":13371},"_resolved_are_video_session_parameters_objects_dependent_on_the_used_video_encode_quality_level",[13373],{"type":15,"value":13374},"RESOLVED: Are video session parameters objects dependent on the used video encode quality level?",{"type":10,"tag":11,"props":13376,"children":13377},{},[13378],{"type":15,"value":13379},"Some implementations may support different hardware modes that are enabled in response to the used video encode quality level. This may also have an effect on the constraints related to the available encoding tools and as such may also affect the necessary codec-specific parameter overrides the implementation has to apply. As video session parameters objects are expected to store the already overridden codec-specific parameters typically in an encoded or otherwise optimized format, using a video session parameters object with any video encode quality level would require implementations to also store the original parameters in order to be able to re-encode them according to the needs of the target video encode quality level, which would partially defeat the purpose of video session parameters object.",{"type":10,"tag":11,"props":13381,"children":13382},{},[13383],{"type":15,"value":13384},"Instead, this proposal defines video session parameters objects to be created with respect to a specific video encode quality level (when using a video encode profile) and applications have to make sure that they use a compatible video session parameters object in their encode commands according to the current quality level state of the video session.",{"type":10,"tag":11,"props":13386,"children":13387},{},[13388],{"type":15,"value":13389},"In practice, this should not have any effect on most encoder applications, as usually they use a single video encode quality level throughout the lifetime of the video session, so the additional complexity resulting from this specialization will only affect advanced applications that may need to operate using different video encode quality levels within a single video stream.",{"type":10,"tag":116,"props":13391,"children":13393},{"id":13392},"_resolved_are_video_encode_quality_levels_and_rate_control_mutually_exclusive",[13394],{"type":15,"value":13395},"RESOLVED: Are video encode quality levels and rate control mutually exclusive?",{"type":10,"tag":11,"props":13397,"children":13398},{},[13399,13401,13406],{"type":15,"value":13400},"No, they are completely orthogonal, as they control different aspects of the encoder, and they are both always in effect all the time. There is always a currently active video encode quality level and rate control state, which default to quality level zero and implementation-specific rate control state, respectively, when the video encode session is initialized. The used video encode quality level and the rate control settings can be updated subsequently, potentially independently, or together with initialization per the application’s needs. The only relation between video encode quality levels and rate control is that the application can query for each video encode profile and video encode quality level the implementation recommended settings (using ",{"type":10,"tag":89,"props":13402,"children":13404},{"className":13403},[],[13405],{"type":15,"value":546},{"type":15,"value":13407},") that are best suited for the selected quality level and the usage scenario information included in the video encode profile. These include recommendations on the rate control mode to use amongst other codec-independent and codec-specific suggestions. Nonetheless, these are only recommendations and the application can diverge from these if deemed necessary.",{"type":10,"tag":116,"props":13409,"children":13411},{"id":13410},"_resolved_does_specifying_vkvideoencoderatecontrolinfokhr_in_the_pnext_chain_of_the_pbegincodinginfo_parameter_of_vkcmdbeginvideocodingkhr_change_the_current_rate_control_configuration",[13412,13414,13419,13421,13426,13427,13432,13434,13439],{"type":15,"value":13413},"RESOLVED: Does specifying ",{"type":10,"tag":89,"props":13415,"children":13417},{"className":13416},[],[13418],{"type":15,"value":3415},{"type":15,"value":13420}," in the ",{"type":10,"tag":89,"props":13422,"children":13424},{"className":13423},[],[13425],{"type":15,"value":701},{"type":15,"value":2019},{"type":10,"tag":89,"props":13428,"children":13430},{"className":13429},[],[13431],{"type":15,"value":3455},{"type":15,"value":13433}," parameter of ",{"type":10,"tag":89,"props":13435,"children":13437},{"className":13436},[],[13438],{"type":15,"value":3434},{"type":15,"value":13440}," change the current rate control configuration?",{"type":10,"tag":11,"props":13442,"children":13443},{},[13444,13446,13451,13453,13458,13460,13465],{"type":15,"value":13445},"No. The rate control information specified to ",{"type":10,"tag":89,"props":13447,"children":13449},{"className":13448},[],[13450],{"type":15,"value":3434},{"type":15,"value":13452}," does not change the state of the video session, it is only expected to specify the current rate control configuration (previously already set through the execution of an appropriate ",{"type":10,"tag":89,"props":13454,"children":13456},{"className":13455},[],[13457],{"type":15,"value":2466},{"type":15,"value":13459}," command). This information is needed by some implementations in order to be aware of the current rate control configuration of the video session while recording commands, as some of the rate control state may affect the recorded device commands. When this information is not specified, the implementation will assume that the current rate control mode is set to ",{"type":10,"tag":89,"props":13461,"children":13463},{"className":13462},[],[13464],{"type":15,"value":2980},{"type":15,"value":2295},{"type":10,"tag":11,"props":13467,"children":13468},{},[13469,13471,13476],{"type":15,"value":13470},"The validation layers are expected to detect at command buffer submission time if there is any mismatch between the expected rate control configuration specified to the ",{"type":10,"tag":89,"props":13472,"children":13474},{"className":13473},[],[13475],{"type":15,"value":3434},{"type":15,"value":13477}," command and the actual rate control configuration of the video session at the time the video coding scope is started on the device timeline. If these two sets of state do not match, then the behavior of the implementations is undefined and may result in any sort of misbehavior permitted by the Vulkan specification when valid usage conditions are not met. Accordingly, applications have to make sure to track and specify the expected rate control configuration at the beginning of every video coding scope performing video encode operations in order to attain correct encoder behavior.",{"type":10,"tag":116,"props":13479,"children":13481},{"id":13480},"_resolved_when_is_it_mandatory_to_specify_reconstructed_picture_information_in_vkvideoencodeinfokhrpsetupreferenceslot",[13482,13484,13489],{"type":15,"value":13483},"RESOLVED: When is it mandatory to specify reconstructed picture information in ",{"type":10,"tag":89,"props":13485,"children":13487},{"className":13486},[],[13488],{"type":15,"value":13054},{"type":15,"value":12977},{"type":10,"tag":11,"props":13491,"children":13492},{},[13493,13495,13501],{"type":15,"value":13494},"In line with the ",{"type":10,"tag":89,"props":13496,"children":13498},{"className":13497},[],[13499],{"type":15,"value":13500},"VK_KHR_video_decode_queue",{"type":15,"value":13502}," extension, due to foreseeable implementation limitations that may require the presence of a reconstructed picture resource and/or DPB slot for encoding, revision 12 of this extension changed the requirements on reconstructed picture information as follows:",{"type":10,"tag":65,"props":13504,"children":13505},{},[13506,13524],{"type":10,"tag":33,"props":13507,"children":13508},{},[13509,13511,13516,13517,13522],{"type":15,"value":13510},"Specifying reconstructed picture information (i.e. a non-",{"type":10,"tag":89,"props":13512,"children":13514},{"className":13513},[],[13515],{"type":15,"value":1282},{"type":15,"value":1300},{"type":10,"tag":89,"props":13518,"children":13520},{"className":13519},[],[13521],{"type":15,"value":1151},{"type":15,"value":13523},") is made mandatory for all cases except when the video session was created with no DPB slots",{"type":10,"tag":33,"props":13525,"children":13526},{},[13527,13529,13534,13535,13540],{"type":15,"value":13528},"Reference picture setup (and, inherently, DPB slot activation) was changed to be subject to codec-specific behavior, meaning that specifying a non-",{"type":10,"tag":89,"props":13530,"children":13532},{"className":13531},[],[13533],{"type":15,"value":1282},{"type":15,"value":1300},{"type":10,"tag":89,"props":13536,"children":13538},{"className":13537},[],[13539],{"type":15,"value":1151},{"type":15,"value":13541}," will only trigger reference picture setup if the appropriate codec-specific parameters or semantics indicate so (typically in the form of marking the encoded picture as reference)",{"type":10,"tag":11,"props":13543,"children":13544},{},[13545,13547,13552,13553,13558],{"type":15,"value":13546},"As some implementations may use the reconstructed picture resource and/or DPB slot as transient storage during the decoding process, if a non-",{"type":10,"tag":89,"props":13548,"children":13550},{"className":13549},[],[13551],{"type":15,"value":1282},{"type":15,"value":1300},{"type":10,"tag":89,"props":13554,"children":13556},{"className":13555},[],[13557],{"type":15,"value":1151},{"type":15,"value":13559}," is specified but no reference picture setup is requested, then the contents of the reconstructed picture resource become undefined and some of the picture references associated with the reconstructed picture’s DPB slot may get invalidated.",{"type":10,"tag":17,"props":13561,"children":13563},{"id":13562},"_further_functionality",[13564],{"type":15,"value":13565},"Further Functionality",{"type":10,"tag":11,"props":13567,"children":13568},{},[13569],{"type":15,"value":13570},"This extension is meant to provide only common video encode functionality, thus support for individual video encode profiles using specific video compression standards is left for extensions layered on top of the infrastructure provided here.",{"type":10,"tag":11,"props":13572,"children":13573},{},[13574],{"type":15,"value":13575},"Currently the following layered extensions are available:",{"type":10,"tag":29,"props":13577,"children":13578},{},[13579,13590],{"type":10,"tag":33,"props":13580,"children":13581},{},[13582,13588],{"type":10,"tag":89,"props":13583,"children":13585},{"className":13584},[],[13586],{"type":15,"value":13587},"VK_KHR_video_encode_h264",{"type":15,"value":13589}," - 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