James Almer (12023-07-23):
> What about when FF_FILTER_FLAG_HWFRAME_AWARE filters are present in the
> graph? hw_frames_ctx from AVFilterLink can't be accessed from outside lavfi.
> Is vf_hwdownload meant to be added to the graph before buffersink?

I do not know how hardware acceleration works at all. (The tidbits of
discussion I catch left me the impression all of it is very badly
designed, but I have low confidence in that impression.) If this API
only works with filters that output software frames, it is already very
useful.

Regards,

-- 
  Nicolas George