I also noticed that recently there is a lot of activity to add full Nvidia 
decoders  to FFmpeg (VC1, MPEG4, VP8, VP9 etc.).
I am guessing this is to overcome DXVA or VAAPI shortcoming. What about AMD? We 
also have them.

The primary motivation here is that nvidia abandoned vdpau, so to access more modern decoder features, which on Windows are easily available through DXVA2/D3D11VA, you are forced to use their API.

If AMD properly supports all those(most prominently VP9 and 10/12bit) via vaapi/dxva, there shouldn't be a reason for another API.

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