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DM8168 DVRRDK4.0 VDEC_VDIS H264 Decode for 1080p

cherish
Intellectual 870 points

您好

我使用DM8168 VDEC_VDIS这个Demo，A8核读取1920*1080的264码流，，，Video M3核上的DEC Link后，到IPC_OUT，这时候，我将解码后的YUV420SP视频帧物理地址发送给A8核，A8核将视频帧通过PCIe发送出去，对方接收到该视频帧，做一个Sobel处理（处理Y分量），发现必须按照大小为2048*1176的大小而不是1920*1080的大小处理，才能处理正确。为什么264解码后，1920*1080 会处理成 2048*1176 吗？在哪里的源码由相关的体现？

谢谢！

HI,

i use the DM8168 and DVRRDK4.0, and use the VDEC_VDIS Demo. In the usecase, it is 1920*1080 bitstream, and In the Video M3 core, after the DEC Link is the IPC_OUT Link, i send the physical address of decoded YUV420SP video frame, to A8 Core, A8 Core use its addr and send to C6678 by PCIe interface, in the C6678, i must Sobel processing for the YUV420SP video frame as it is 2048*1176,so it can be correct, and send to C6678 also need 2048*1176.

that is to say, 1920*1080 decode to 2048*1176, i do not know why, if it is so, where is the related code in the dec link?

Best Regards.

  • 0
    Intellectual 870 points

    HI,

    i use the DM8168 and DVRRDK4.0, and use the VDEC_VDIS Demo. In the usecase, it is 1920*1080 bitstream, and In the Video M3 core, after the DEC Link is the IPC_OUT Link, i send the physical address of decoded YUV420SP video frame, to A8 Core, A8 Core use its addr and send to C6678 by PCIe interface, in the C6678, i must Sobel processing for the YUV420SP video frame as it is 2048*1176,so it can be correct, and send to C6678 also need 2048*1176.

    that is to say, 1920*1080 decode to 2048*1176, i do not know why, if it is so, where is the related code in the dec link?

    Best Regards.

  • 0
    Prodigy 160 points
    hi cherish;

    1, I suggest you analyze phases;
    2, the decoded data is certainly 1080P, there may be 2048 * 1176 transfer or cause other problems;
    3, if you suspect a problem H264 decoding, you can then do the test individually H264 decoding；

    Best Regards
    Ternence Hsu