gistfile1.txt

( stuff before this... )

command="mkvpropedit \"$input_file\""

# Set all audio tracks to not default
echo "$audio_tracks" | jq -r '.id' | while read -r track_id; do
    command+=" --edit track:a$track_id --set flag-default=0"
done

# Set the English track to default
command+=" --edit track:a$english_track --set flag-default=1"

# Execute the command
eval "$command"