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rated 0 times [ 21] [ 0] / answers: 1 / hits: 20655 / 3 Years ago, sat, june 26, 2021, 7:34:44

I have about 70 mp4 files, and I want to extract the audio files directly without transcoding further. All the mp4 files have aac audio files.

I understand I can use the following command to extract the audio file from one of the mp4 files:

avconv -i "INPUT FILE" -map 0:1 -c:a copy "OUTPUT FILE"

How do I extract all the audio files from all the 70 mp4 files, so I end up with 70 aac files?

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answered 3 Years ago inaterested · Accepted Answer

You can use a simple for loop:

for i in *.mp4; do

    avconv -i "${i}" -map 0:1 -c:a copy "${i%.mp4}.aac"

done

or on one line:

for i in *.mp4; do avconv -i "${i}" -map 0:1 -c:a copy "${i%.mp4}.aac"; done

What is does is run avconv once for every file named like *.mp4 where the filename is stored in the ${i} variable.

${i%.mp4} means ${i} (ie. the filename) with .mp4 stripped off from the end.