How to bulk/batch edit music metadata?

[AlperShal]

MusizBrainz Picard is a server application that processes your data in place.

Oh I missed that. Yeah that could have been a fix thanks. For future readers: I have found FFMPEG can edit metadata so here is two shell commands that can do this via ffmpeg or ffmpeg docker:

Code:

for i in *.flac
    ffmpeg -i $i -metadata GENRE=Rock output.flac; mv output.flac $i
end

This one first prints the current genre tag, changes it and prints the changed genre tag.

Code:

set GENRE "Rock, Alternative Rock";
for i in *.flac
    docker run -v $PWD:$PWD -w $PWD jrottenberg/ffmpeg:3-alpine -i $i - 2>&1 | grep "GENRE"
    sleep 0.5
    docker run -v $PWD:$PWD -w $PWD jrottenberg/ffmpeg:3-alpine -i $i -metadata GENRE=$GENRE output.flac
    mv output.flac $i
    docker run -v $PWD:$PWD -w $PWD jrottenberg/ffmpeg:3-alpine -i $i - 2>&1 | grep "GENRE"
    echo ========
end