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#!/bin/sh

FILENAME=$1
BASENAME=`basename $FILENAME .mp4`
FPS=1
if [ $# -ge 2 ]; then
    FPS=$2
fi

ffmpeg -i $FILENAME -f image2 -vf fps=$FPS tmp/${BASENAME}.%3d.png
convert -delay 50 -loop 0 tmp/${BASENAME}.*.png ${BASENAME}.gif

rm -f tmp/${BASENAME}.*.png