[Libav-user] Extracting motion vectors reference frames from H264Picture struct

[Ahmed Samir]

Hi,

I want to get the motion vectors and their reference frames. Unfortunately, the extract_mvs example gives only the direction of the reference frame +/- 1 direction as described in line28<https://ffmpeg.org/doxygen/4.0/motion__vector_8h_source.html#l00028> in the AVMotionVector struct. I had to go through the code of the H264 decoder and I concluded that I can get this information from the H264Picture struct<https://ffmpeg.org/doxygen/4.0/structH264Picture.html> from the motion_val, ref_index and ref_pocs data fields. But it seems like my conclusion is not right because I cannot interpret the values in these fields. Any help?

Thanks
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