I am using h264_vapppi to decode video. The output pix_format is vappi_vld,
I want to change its pix_format so that I can get the picture data.
I use av_hwframe_transfer_data to change format to NV12,
Then, I try to change NV12 to rgb24 using sws_scale, but it turns out
to be NULL.
So how can I do this, thank you!
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