(Cross-post from Stack Exchange: https://video.stackexchange.com/questions/37660/ffmpeg-how-to-preserve-colour-space-automatically )
I currently have a source video with the following properties: Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuvj444p(pc, > bt709/bt709/iec61966-2-1, progressive), 2560x1440 [SAR 1:1 DAR 16:9], 60 > fps, 60 tbr, 1k tbn I want to transcode it into the following formats after applying cuts and other effects: - H.264 YUV444 (yuvj444p) - H.264 YUV420 (yuvj420p) - AV1 YUV444 10-bit (yuv444p10le) - AV1 YUV420 10-bit (yuv420p10le) However, except for the yuvj444p → yuvj444p transcode, the resulting files have significantly different colours than the original when played back. This seems to be because ffmpeg stripped the colour space information (to `unknown`) from the output files: $ ffmpeg -i source.mkv -c:v libx264 -preset veryslow -pix_fmt yuvj444p -crf > 16 x264-444.mkv > ... > Output #0, matroska, to 'x264-444.mkv': > Stream #0:0: Video: h264 (H264 / 0x34363248), yuvj444p(pc, > bt709/bt709/iec61966-2-1, progressive), 2560x1440 [SAR 1:1 DAR 16:9], > q=2-31, 60 fps, 1k tbn > $ ffmpeg -i source.mkv -c:v libx264 -preset veryslow -pix_fmt yuvj420p > -crf 16 x264-420.mkv > ... > Output #0, matroska, to 'x264-420.mkv': > Stream #0:0: Video: h264 (H264 / 0x34363248), yuvj420p(pc, > unknown/bt709/iec61966-2-1, progressive), 2560x1440 [SAR 1:1 DAR 16:9], > q=2-31, 60 fps, 1k tbn > $ ffmpeg -i source.mkv -c:v librav1e -speed 9 -tiles 24 -pix_fmt > yuv444p10le -qp 64 rav1e-444.mkv > ... > Output #0, matroska, to 'rav1e-444.mkv': > Stream #0:0: Video: av1 (AV01 / 0x31305641), > yuv444p10le(unknown/bt709/iec61966-2-1, progressive), 2560x1440 [SAR 1:1 > DAR 16:9], q=2-31, 60 fps, 1k tbn > $ ffmpeg -i source.mkv -c:v libsvtav1 -preset 5 -svtav1-params > tune=2:film-grain-denoise=0 -pix_fmt yuv420p10le -crf 16 > ... > Output #0, matroska, to 'svtav1-420.mkv': > Stream #0:0: Video: av1 (AV01 / 0x31305641), > yuv420p10le(unknown/bt709/iec61966-2-1, progressive), 2560x1440 [SAR 1:1 > DAR 16:9], q=2-31, 60 fps, 1k tbn My current ffmpeg version is 7.0.2-3 (specifically Debian's 7:7.0.2-3). The actual source video file is too large to include here, but I clipped and cropped a small snippet of it here that demonstrates the same issue: https://files.catbox.moe/q8oy1h.mp4 I can fix it by passing `-colorspace bt709` to ffmpeg, but that relies on me already knowing the source video to be BT.709, so sounds error prone. Is there a way to have ffmpeg automatically preserve the source video's colour space? _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
