Extract Subtitles from mkv

extractMkvSubtitles.sh

#!/bin/bash
# Extract SRT subtitles from each MKV file in the given directory
# call script.sh <path> <language-searchtag>

# If no directory is given, work in local dir
if [ "$1" = "" ]; then
  DIR="."
else
  DIR="$1"
fi

searchname="$2"

# Get all the MKV files in this dir and its subdirs
find "$DIR" -type f -name '*.mkv' | while read filename
do
  echo Scanning $filename
  # Find out which tracks contain the subtitles
  mkvmerge -J "$filename" | jq -r '
    .tracks |
      map((.id | tostring) + " " + .properties.language + .properties.track_name + " " + .codec) |
      join("\n")' | grep 'SubRip' | while read subline
  do

    #echo subline $subline
    # Grep the number of the subtitle track
    tracknumber=`echo $subline | cut -d' ' -f1`

    language=`echo $subline | cut -d' ' -f2`

    # Get base name for subtitle
    subtitlename="${filename%.*}_$language"

    #echo found $language
    # add language check if you like e.g.:
	echo Found $language
    if [[ "$language" == "$searchname"* ]]
	then
		echo extracting srt..
    		mkvextract tracks "$filename" $tracknumber:"$subtitlename.srt" > /dev/null 2>&1
	    	chmod g+rw "$subtitlename.srt"
	else
		echo skipping.
	fi
  done
done