Hi all, I have a few questions/issues with nVidia's hardware acceleration of ffmpeg. I originally posted them as an issue in the bugtracker:
https://trac.ffmpeg.org/ticket/7537 I'll copy and paste them here also for reference: Why are there two separate implementations of nvidia hardware acceleration? As far as I understand nvdec is simply a rebranding of cuvid. Yet in FFmpeg they coexist and exhibit different behaviors. 1. Is either of nvdec/cuvid the recommended one to use? Is either one deprecated? 2. cuvid does not auto-detect the decoder. This works correctly: "ffmpeg -hwaccel cuvid -c:v h264_cuvid -i ...", and so does "ffmpeg -hwaccel nvdec -i ...", but this does not: "ffmpeg -hwaccel cuvid -i ..." 3. cuvid is noticably (although not drastically) faster. Maybe around 15-20% 4. "ffmpeg -decoders" displays some cuvid-related things, but nothing nvdec-related 5. nvdec is not displayed when running "ffmpeg -hwaccels" 6. When using scale_npp with cuvid it can be used with just "-vf scale_npp=..." whereas nvdec requires "-vf hwupload_cuda,scale_npp=..." I'm not sure which of those are bugs, which are by design, which are normal. I'll appreciate any insight on each of them. Thanks, Boris Petrov _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
