createTiles - create movie previews using mplayer

#/bin/bash

#default parameters
tiles=19
endPos=-5;
startPos=5;
tempDir=/tmp;
oFileName=\${in}_preview.jpg;
deleteIntermidiate=true;
previewFile=true;

if [[ $# == 0 ]]; then
    echo    "movie snapshot creator, by Tsahee Zidenberg"
    echo    "usage: $0 [options] <filenames> [new options] <new filenames>"
    echo    " options:"
    echo    "  -b   (Begin) first shot to take [$startPos]"
    echo    "  -e   (End) last shot to take [$startPos]"
    echo    "           negative values count from end of file"
    echo    "  -n   Number of shots [$tiles]"
    echo    "  -t   Temporary dir to use [$tempDir]"
    echo    "  -o   Output filename [$oFileName]"
    echo    "           \\\${in} for input filename"
    echo    "  -p   Preview with eye of gnome [default behaviour]"
    echo    "  -NP  No preview"
    echo    "  -D   Don't delete intermidiate Files"
    echo    "Time is always in seconds"
    echo    "requires: mplayer, ImageMagick (convert, montage)"
    exit 1
fi

#input variable: integer, number of secounds
#ouput: time as h:mm:ss
printTime(){
    local hr min sec
    (( hr = ($1 +0) / 3600 ))
    (( min = ($1 +0 - hr*3600) / 60 ))
    (( sec = ($1 +0) % 60 ))
    if (( sec < 10 )); then
        sec=0$sec
    fi
    if (( min < 10 )); then
        min=0$min
    fi
    echo $hr:$min:$sec
}

processFile() {
    inputFile=$1;
    echo "Processing $inputFile:"
    #reading attributes from the file
    #
    fileAttributes=(`mplayer -identify -frames 0 -vo null -ao null $inputFile 2>/dev/null \
                | grep -e ID_LENGTH -e ID_VIDEO_WIDTH -e ID_VIDEO_HEIGHT -e ID_VIDEO_FORMAT  \
                | sort | cut -d"=" -f2 | cut -d"." -f1`)
    fileLength=${fileAttributes[0]}
    fileVideoFormat=${fileAttributes[1]}
    fileVideoSize=${fileAttributes[2]}x${fileAttributes[3]}
    inputFileDir=`dirname "$inputFile"`
    inputFileDir=`cd "$inputFileDir"; pwd`

    #save directory and move to /tmp
    cd "$tempDir"

    #creating the title tile
    #
    curTile="tmp_${inputFile}_tile_title.jpg"
    rm -f $curTile
    time=$(printTime $fileLength)
    convert -size 200x200 xc:white -pointsize 16 -draw "text 0,30 ${inputFile}" -draw "text 0,60 \"$time\"" \
                    -draw "text 0,90 \"${fileVideoSize}\"" -draw "text 0,120 \"${fileVideoFormat}\"" $curTile

    tileList[0]="$tempDir/$curTile"
    tileNLabelList[0]="$tempDir/$curTile"

    #preparations for the loop
    if (( endPos <= 0 )); then
        (( lastPos = fileLength + endPos ))
    else
        (( lastPos = endPos ))
    fi
    (( jump = (lastPos - startPos) / (tiles-1) ))
    curTileNo=1
    curPos=$startPos
    rm -f 00000001.jpg
    while (( curTileNo <= tiles )); do
        mplayer -frames 1 -ss $curPos -vo jpeg -ao null "$inputFileDir/$inputFile" -quiet >/dev/null 2>/dev/null
        curTile="tmp_${inputFile}_tile_${curTileNo}.jpg"
        mv -f 00000001.jpg "$curTile"
        tileList[$curTileNo]="$tempDir/$curTile"
        tileNLabelList[((curTileNo*3))]="-label"
        tileNLabelList[((curTileNo*3+1))]="$(printTime $curPos)"
        tileNLabelList[((curTileNo*3+2))]="$tempDir/$curTile"
        echo " $curTileNo/$tiles"
        (( curTileNo++ ))
        if (( curTileNo == tiles )); then
            curPos=$lastPos
        else
            (( curPos += jump ))
        fi
    done
    echo "joining tiles.."

    #change back to the original directory
    cd "$workingDir"

    #create the final image
    outFile=`in=$inputFile;eval echo $oFileName`
    rm -f "$outFile"
    montage "${tileNLabelList[@]}" "$outFile"

    if [[ $previewFile == true ]]; then
        eog "$outFile" &
    fi

    #remove temporary files
    if [[ $deleteIntermidiate == true ]]; then
        rm -f "${tileList[@]}"
    fi
}

workingDir=`pwd`

while (( "$#" )); do
    if [[ -f "$1" ]]; then
        processFile "$1"
        shift 1
    elif [[ "$1" == "-p" ]]; then
        previewFile=true;
        shift 1
    elif [[ "$1" == "-NP" ]]; then
        previewFile=false;
        shift 1
    elif [[ "$1" == "-n" ]]; then
        (( tiles = $2 +0 ))
        shift 2
    elif [[ "$1" == "-b" ]]; then
        (( startPos = $2 +0 ))
        shift 2;
    elif [[ "$1" == "-e" ]]; then
        (( endPos = $2 +0 ))
        shift 2;
    elif [[ "$1" == "-t" ]]; then
        tmpDir="$2";
        if [[ ! -d tmpDir ]]; then
            echo "Not a directory: $2"
            exit -1;
        fi
        shift 2
    elif [[ "$1" == "-o" ]]; then
        oFileName="$2"
        shift 2
    elif [[ "$1" == "-D" ]]; then
        deleteIntermidiate=false;
        shift 1
    else
        echo "bad parameter: $1"
        echo "use: $0 with no parameters for help"
        exit -1
    fi
done