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every time you recompress a file you lose quality



Hence the use of the word "remux", it's lossless (no re-encoding).


It doesn't support H.264 or AAC. Just changing the container.


-vcodec copy -acodec copy


mp4 files usually contain H.264 encoded video which requires the paid version for audio it usually contains AAC encdoded audio which is not supported at all. You can't get away with just copying.




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