Am Sa., 4. Apr. 2020 um 13:17 Uhr schrieb Ryo Hirafuji <ryo.hiraf...@link-u.co.jp>: > > > So "crf 0" already has a meaning different from all other crf values? > > No. "crf 0" has the same meanings. It just makes the quality better than > "crf 1".
That was my question, sorry for being unclear. > I read libaom again, and I apologize for my wrong explanation: > I found that if certain conditions are met, "crf 0" also generates > lossless videos. > > If these conditions are not met, "-crf 0" will be lossless: > > <<FFmpeg options>> > "-bit_rate 0" (which means, enccfg.rc_end_usage = AOM_Q) > "-aq-mode none" > "-enable_restoration 0" > > <<the libaom settings which can't be configured from FFmpeg yet>> > AV1E_SET_ENABLE_CHROMA_DELTAQ must be 0 > AV1E_SET_ENABLE_SUPERRES must be 0 > > Thus, at least, "-lossless" does have a different meaning from "-crf 0", > so I think it would be useful to add "-lossless" flags. In an ideal world, crf 0 would force all other settings for a lossless encoding. Carl Eugen _______________________________________________ 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".
