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natecostello/readme.md

Last active October 7, 2023 02:26
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Convert ALAC to AAC
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readme.md

for i in *.m4a; do ffmpeg -i "$i" -c:a aac -b:a 256k "${i%.*}.aac"; done

To determine if alac or acc:

for i in *.m4a; do t=$(ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$i"); echo $t $i ; done

In a mixed directory, to only convert alac to aac:

for i in *.m4a; do t=$(ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 "$i"); if [ $t = 'alac' ]; then ffmpeg -i "$i" -c:a aac -b:a 256k "${i%.*}.aac" ; fi; done;

To delete leftover alac:

for i in *.aac; do rm "${i%.*}.m4a"; done

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