gifcreate

#!/bin/sh
if [ -z "$6" ]
then
    echo "Usage: `basename $0` [-n] <filename> <start time> <duration> <scale to width> <framestep> <resultname.gif>\n-n — turn off subtitles"
else
    OPT=
    if [ "$1" = "-n" ]
    then
        OPT="-nosub -noautosub"
        shift
    fi
    STEP=$5
    TEMP=`mktemp -d /tmp/mpgifXXXXXX`
    FILENAME=$( readlink -f "$1" )
    cd "$TEMP"
    FPS=$( mplayer "$FILENAME" $OPT -ss $2 -endpos $3 -vf scale=$4:-2,framestep=$5 -nosound -vo png:z=9 2>&1 | sed -n 's/.* \([0-9]*\)\.[0-9]* fps .*/\1/p' )
    DELAY=$(( 100 * STEP / FPS ))
    xdg-open "$TEMP"
    read -p "Now remove any excessive frames and press Enter to combine them to a nice gif." null
    convert -delay $DELAY "$TEMP/*.png" -layers optimize-transparency "$6"
    rm -rf "$TEMP"
fi