Quoting Zhao Zhili (2024-12-11 05:23:20) > From: Zhao Zhili <zhiliz...@tencent.com> > > What works: > > 1. Create a sample with macOS videotoolbox > ffmpeg -i base.mp4 -i alpha.mp4 \ > -c:v hevc_videotoolbox -alpha_quality 0.5 -b:v 2M \ > -filter_complex > '[0:v]scale,format=bgra[v0];[1:v]scale=640x480,format=gray[v1];[v0][v1]alphamerge[v2]' > \ > -map '[v2]' -y hevc-alpha.ts > > Then you can remux it to mp4 if you prefer. > > 2. Decoding test > > a. Check alpha plane > ./ffmpeg -i hevc-alpha.ts -an -vf extractplanes=planes=a -f nut - |ffplay - > > b. Check Y plane > ./ffmpeg -i hevc-alpha.ts -an -vf extractplanes=planes=y -f nut - |ffplay - > > What doesn't work: > > 1. Encoding with videotoolbox and output as mp4 directly, due to missing PS. > Can be fixed by > > https://patchwork.ffmpeg.org/project/ffmpeg/patch/20241210191641.676-1-t...@rothenpieler.org/ > > 2. vps_extension is over-engineering and decode_vps_ext() is far from > complete. > A complete implementation might take a week, and I don't have enough spare > time. > I would greatly appreciate it if someone could help implement it.
Do we need a complete implementation, when we do not intend to support all the possible combinations of all the possible multi-layer types? I'd prefer not to handle all the insanity until we really need to. -- Anton Khirnov _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
