I wonder can I re-encode a MP4 changing the colormatrix fron 601 to 709 in vcodec copy? No? however is there a way to tell to ffmpeg that, in case of transcoding, that it have to change only the colormatrix and preserve all the video part as is?
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1. You can change the colormatrix flag but not content using a special ffmpeg build without re-encoding. But it is a bit buggy and not developed anymore.
ffmpeg -i "input" -vf scale=in_color_matrix=bt601:out_color_matrix=bt709 -colorspace bt709 -c:v libx264 -crf 18 -preset medium -c:a copy "output.mp4"
Last edited by sneaker; 10th Mar 2017 at 05:16.