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dxva2 decode h264 output format

老周 杂家 1 Reputation point
2020-08-30T06:03:49.01+00:00

when I use dxva2 decode h264 in ffmpeg,the output format in surface sometimes is nv12,and sometime is nv21,how can I know which format is .D3DSURFACE_DESC Format is same.

Windows API - Win32
Windows API - Win32
A core set of Windows application programming interfaces (APIs) for desktop and server applications. Previously known as Win32 API.
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C++
C++
A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
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  1. Rita Han - MSFT 2,161 Reputation points
    2020-09-02T03:02:42.967+00:00

    Hello,

    There is a need to convert NV12 / NV21 to D3D supported surface format like D3DFMT_R8G8B8.

    NV21 is same as NV12, except that Cb and Cr samples are swapped. All you need to do, is to reverse the order.

    More references: "Recommended 8-Bit YUV Formats for Video Rendering", "Color Converter DSP" and "DirectXMath Library color functions ( XMColorYUVToRGB )"

    Thank you!

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  2. 老周 杂家 1 Reputation point
    2020-09-02T05:06:11.167+00:00

    FFMPEG call dxva2 APIs decode h264 and return D3D surface,D3DSURFACE_DESC Format is same while decoed frame is NV12 or NV21,if I scale and convert the source frame(include format convert) to NV12,output format and frame data are right.but this will Increase CPU consumption.