<stdin>

glc2webm()
{
    local glcFile
    local glcBase
    local out
    local fpsRate
    local bitrate
    local maxsize
    local sizearg

    if [[ "$1" == "" ]]
    then
        echo "error: $0: no glc file specified" >&2
        return 127
    fi

    if [[ "$2" == "" ]]
    then
        fpsRate=30
    else
        fpsRate=$2
    fi

    if [[ "$3" == "" ]]
    then
        bitrate="1024k"
    else
        bitrate="${3}k"
    fi


    if [[ "$4" == "" ]]
    then
        sizearg=""
        maxsize="any"
    else
        sizearg=("-fs" "${4}")
        maxsize="$4"
    fi

    glcFile="$1"
    glcBase="$(basename $glcFile)"
    glcBase="${1/.*/}"
    out="$glcBase.webm"

    if [ -e "$out" ]
    then
        if [ -f "$out" ]
        then
            echo "warning: $out existed beforehand, moved to $out.old" >&2
            mv $out $out.old
        else
            echo "error: $out exists and is not a regular file, skipping" >&2
            continue
        fi
    fi

    echo "Encoding ${glcFile} at FPS of ${fpsRate} at ${bitrate}, max size $maxsize"

    echo "Dumping to MP4..."
    (glc-play $glcFile -o - -y 1 -g "0.02;0;1.35;1.35;1.35" | ffmpeg -i - -y -loglevel warning video-$glcBase.mp4)

    local error=$?
    if [[ $error != 0 ]]
    then
        echo "Error on dumping, aborting"
        return $error
    fi

    echo "Pass 1..."
    ffmpeg -i video-$glcBase.mp4 -codec:v libvpx -b:v $bitrate -r $fpsRate $sizearg -c 4 -quality best -bufsize 2048k -an -threads 3 -pass 1 -f webm -loglevel warning - >/dev/null

    local error=$?
    if [[ $error != 0 ]]
    then
        echo "Error on pass 1, aborting"
        return $error
    fi

    echo "Pass 2..."
    ffmpeg -i video-$glcBase.mp4 -codec:v libvpx -b:v $bitrate -r $fpsRate $sizearg -c 4 -quality best -bufsize 2048k -an -threads 3 -pass 2 -f webm -loglevel warning $out

    local error=$?
    if [[ $error != 0 ]]
    then
        echo "Error on pass 2, aborting"
        return $error
    fi

    rm video-$glcBase.mp4
    echo "dun, look at $out (size $(du -h ${out} | cut -f1))"
}