[Libav-user] h264 sps frame_cropping_flag = 1, dxva decode How to get left offset or top offset?

[朱伟滔]

in H264 sps，I set a different sps
    bool frame_cropping_flag = 1;
        int frame_crop_left_offset = 100;
        int frame_crop_right_offset = 100;
        int frame_crop_top_offset = 100;

        int frame_crop_bottom_offset = 100;

when I decode the video and show it , dxva or vaapi  just show the top left corner(0,0), How can I get left offset or top offset in AVFrame?
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