Script to remux MKVs to MP4s

mkv2mp4.sh

#!/bin/bash

if [ "$1" == "" ]; then
    echo "Usage: $0 <file>"
    exit 0
fi

tempdir="/home/torrent/temp"
MKTMP="mktemp -u -p ${tempdir}"

        # Get filename information
        fullpath=$(realpath "$1")
        outputdir=$(dirname "$fullpath")
        filename=$(basename "$fullpath")
        name=${filename%.*}

        basename=`$MKTMP`
        ln -s "${fullpath}" "${basename}"

        echo -n "Inspecting ${fullpath}... "
        let "video=`mediainfo --Inform=Video\;%ID% ${basename}`-1"
        videofmt=`mediainfo --Inform=Video\;%Format% ${basename}`
        let "audio=`mediainfo --Inform=Audio\;%ID% ${basename}`-1"
        audiofmt=`mediainfo --Inform=Audio\;%Format% ${basename}`
        fps=`mediainfo --Inform=Video\;%FrameRate% ${basename}`
        echo "Done"

        echo "Format: ${videofmt} (${video}) @ ${fps} fps / ${audiofmt} (${audio})"

        echo -n "Extracting Video Track... "
        videofile=`$MKTMP`
        mkvextract tracks "${basename}" "${video}:${videofile}.h264" > /dev/null
        echo "Done"

        echo -n "Extracting & Reencoding ${audiofmt} Audio Track... "
        audiofile=`$MKTMP`

        if [ "${audiofmt}" == "AC-3" ]; then
                mkvextract tracks "${basename}" "${audio}:${audiofile}" > /dev/null
                a52dec "${audiofile}" -o wavdolby | faac - -o "${audiofile}.m4a" > /dev/null
        fi
        if [ "${audiofmt}" == "DTS" ]; then
                mkvextract tracks "${basename}" "${audiofile}.dts" > /dev/null
                dtsdec -o wavdolby "${audiofile}" | faac - -o "${audiofile}.m4a" > /dev/null
        fi
        echo "Done"

        echo -n "Muxing MP4 to ${outputdir}/${name}.mp4... "
        MP4Box -tmp ${tempdir} -add "${audiofile}.m4a" -add "${videofile}.h264" -fps $fps "${outputdir}/${name}.mp4" > /dev/null
        echo "Done"
        rm ${audiofile}* ${videofile}* ${basename}