eng_lang_mkv.sh

# Author:   Hans Guthrie
# Date:     6/19/2016
# Purpose:  Set audio track language to English for all mkvs in current and subfolders
# Future:   Support multiple audio tracks, allow update individual tracks or all, 
#           Test mode using an argument

#find . -type f -iname *.mkv -print0 | xargs -0 

unmodified=/tmp/unmodified-eng.tmp
modified=/tmp/modified-eng.tmp
echo 0 > $unmodified
echo 0 > $modified

find . -iname '*.mkv' | while read line; do
  echo "$line"
  language=$(mediainfo --inform="Audio;%Language%" "$line")
  #if [[ `mediainfo --inform="Audio;%Language%"`= "" ]]
  if [[ "$language" ]]
  then
    echo "Already set to: $language"
    countunmodified=$[$(cat $unmodified) + 1]
  else
    mkvpropedit "$line" --edit track:a1 --set language=eng; 
    echo "Empty!"
    countmodified=$[$(cat $modified) + 1]
  fi
  echo $countunmodified > $unmodified
  echo $countmodified > $modified
done
printf "****************************\nUnmodified Files: %d\nModified Files: %d\n****************************" `cat $unmodified` `cat $modified`
unlink $modified
unlink $unmodified