Keep only the English audio track of a mkv file.

mkv_keep_eng_track.sh

#!/bin/bash

directory=$1

dest=/Volumes/Andre_800G/Serien/ready/
destBin="done"

cd $directory
if [ ! -d "$destBin" ]; then
    echo "Creating folder $destBin..."
    mkdir $destBin
fi

shopt -s nullglob
for f in *.mkv
do
    echo "Processing file $f..."
    trackID=$(mkvmerge -I "$f" | sed -En 's/Track ID ([0-9]*): audio.*language:eng.*/\1/p')
    mkvmerge -o "$dest/$f" -a $trackID "$f"
    echo "Move the file to the \'$done\' folder."
    mv "$f" $destBin
    echo ""
done