makethumbnail

function makethumbnail() {
    filename="$(basename ${1} .mp4)"
    # Use the wadsworth constant to set the time when we want the thumbnail from
    # http://knowyourmeme.com/memes/the-wadsworth-constant
    wadsworth=$(echo "${2} * 0.3 / 1 * 60" | bc)
    echo "INFO:    Creating thumbnail for ${1} by skipping ${wadsworth} seconds ahead."
    if [ ! -f ${filename}.jpg ]; then
        ${FFMPEGPATH}/ffmpeg -loglevel ${LOGLEVEL} -ss ${wadsworth} -i ${1} -vframes 1 -an ${filename}.jpg
        if [ "${?}" -ne 0 ]; then
            echo "ERROR:   Creation of thumbnail for ${1} failed."
            exit 1
        else
            echo "INFO:    Creation of thumbnail ${filename}.jpg succeeded."
        fi
    else
        echo "WARNING: Thumbnail ${filename}.jpg already exists."
    fi
}