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I have a bunch of audio files in a directory some are 128Kbps , some are higher.

I want to convert the ones with a bitrate higher than 128Kbps to 128Kbps to save space. I tried writing a shell script to do this:

#!/bin/bash FILES="*.mp3" for F in $FILES do newname=`basename "$F" -smaller.mp3` ffmpeg -i "$F" -acodec libmp3lame -ac 2 -ab 128k -ar 44100 "$newname.mp3" done

But it also converts files that are already 128Kbps and therefore would take a lot more time to complete.

How could I check if a file`s bitrate is higher than 128Kbps and convert it down to 128Kbps only if so.

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  • Do you have the file command? Commented Jun 3, 2018 at 14:37

1 Answer 1

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Using ffprobe

#!/bin/bash for file in *.mp3 do brate=$(ffprobe "$file" |& grep -Eo 'bitrate: [0-9]+' | cut -d' ' -f2) if [[ "$brate" -gt 128 ]] then newname=$(basename "$file" -smaller.mp3) ffmpeg -i "$file" -acodec libmp3lame -ac 2 -ab 128k -ar 44100 "${newname}.mp3" fi done
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