MKV Subtitle extraction

mkvsubs.sh

#!/bin/bash
# Ismo Vuorinen <ismo@ivuorinen.net>, 2014

SCRIPTNAME=`basename $0`

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


if [[ -n `which mkvextract` ]] && [[ -n `which mkvmerge` ]] && [[ -n `which vobsub2srt` ]]; then

    # Extract subtitles
    find "$DIR" -type f -name '*.mkv' | while read f; do
        mkvmerge --identify-verbose "$f" | grep subtitles | while read sub; do
            [[ "$sub" =~ S_TEXT/ASS ]] && ext=ass || ext=srt
            track=$(awk -F '[ :]' '{print $3}' <<< $sub)
            lang=$(awk -F '[ :]' '{print $18}' <<< $sub)

            # We go through the first time
            if [ ! -f "${f%.mkv}_$lang.$ext" ]; then
                mkvextract tracks "$f" "$track:${f%.mkv}_$lang.$ext"
            fi
        done
    done

    # Convert vobsub to srt
    find "$DIR" -type f -name '*.idx' | while read f; do
        fname=${f%.idx}
        vobsub2srt "$fname"

        # Remove the idx/sub files if we have srt
        if [ -f "$fname.srt" ]; then
            rm "$fname.idx"
            rm "$fname.sub"
        fi

    done

    exit 0

else
    echo "! Could not find either mkvtoolnix tools or vobsub2srt"
    exit 127
fi