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I started using the answer to this question but the correct answer works only for the current directory and I would like to recurse through a tree. The answers given below the one I mention did not help. After research about the find command, I ended up trying 

IFS=$'\0' && for f in `find -name "*.flac"`; do ffmpeg -i "$f"  -vf "crop=((in_w/2)*2):((in_h/2)*2)" -c:a alac "${f%.flac}.m4a"; done

Unfortunately, it does not work and I don't understand why: the output is just a list of ./path/file.flac but no conversion is done.

thierry
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  • I'm voting to close this question as off-topic because this is about command line scripting – audionuma Apr 05 '20 at 06:36
  • you're getting warm but you need to go research ffmpeg. Try getting ffmpeg to work for one file then expand on to the scripting solution. – Mark Apr 05 '20 at 12:27

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