Disable forced subtitles in MKV files

disable_forced_subs.sh

#!/usr/bin/env bash
set -euo pipefail

files=("$@")

function disable_subs() {
  local file=$1
  local forced_track_id

  forced_track_id="$(mkvmerge -J "$file" |
    jq -r '
      .tracks[]
      | select(.type=="subtitles" and .properties.forced_track)
      | .properties.number
    ')"

  if [ -z "$forced_track_id" ]; then
    echo "No forced track. Skipping."
    return
  fi

  mkvpropedit "$file" \
    --edit "track:@${forced_track_id}" \
    --set flag-forced=0
}

for file in "${files[@]}"; do
  echo "Processing $file ..."

  if [ ! -f "$file" ]; then
    echo "File does not exist. Skipping."
    continue
  fi

  disable_subs "$file"
done