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Extracting Hi Res Audio in FLAC From MP4 Video Files





I was sent some bootleg live videos taken by a friend in MP4 format.


I want to extract just the audio tracks which are in 32-48 kHz to FLAC.


I have tried VLC which can only extract to 16-44.1 WAV - the FLAC files turn out weird.


I have also tried AVIdemux which extracts to 16-48 WAV.


Is there anyway to do this while preserving the original 32-48 kHz data?


I am on Mac OS Big Sur if that matters.



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