gistfile1.txt

#!/bin/bash

# Check if a file is provided
if [ $# -eq 0 ]; then
    echo "Please provide an MKV file as an argument."
    exit 1
fi

input_file="$1"

# Check if the file exists
if [ ! -f "$input_file" ]; then
    echo "File not found: $input_file"
    exit 1
fi

# Get the audio tracks information
audio_tracks=$(mkvmerge -J "$input_file" | jq -r '.tracks[] | select(.type=="audio") | {id: .id, properties: .properties}')

# Find the English audio track
english_track=$(echo "$audio_tracks" | jq -r 'select(.properties.language=="eng") | .id')

if [ -z "$english_track" ]; then
    echo "No English audio track found."
    exit 1
fi

# Prepare the mkvpropedit command
command="mkvpropedit \"$input_file\""

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

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

# Execute the command
echo "$command"

echo "Audio track defaults have been updated. English track (ID: $english_track) is now set as default."