Script to sample frames and convert frames to gif using ffmpeg.

ffmpeg_sample_convert_gif

#!/bin/sh

# check arg inputs
verbose=false
while getopts "hi:o:s:d:p:v" opt; do
    case $opt in
        h)
            echo ""
            exit 1
            ;;
        i)
            inFile=$OPTARG
            ;;
        o)
            outDir=$OPTARG
            ;;
        s)
            startTime=$OPTARG
            ;;
        d)
            duration=$OPTARG
            ;;
        p)
            storyPrefix=$OPTARG
            ;;
        v)
            verbose=true
            ;;
        \?)
            echo "Invalid option: -$OPTARG" >&2
            exit 1
            ;;
        :)
            echo "Option -$OPTARG requires an argument." >&2
            exit 1
            ;;
    esac
done

if $verbose ; then
    echo "ffmpeg -i ""$inFile"" -vf scale=iw/2:-1 -r 2 -ss $startTime -t $duration ""$outDir""/frames%3d.png"
fi
ffmpeg -i "$inFile" -vf scale=iw/2:-1 -r 2 -ss $startTime -t $duration "$outDir"/frames%3d.png

if $verbose ; then
    echo "convert -delay 7 -loop 0 ""$outDir""/frames*.png ""$outDir""/""$storyPrefix""_animation.gif"
fi
convert -delay 7 -loop 0 "$outDir"/frames*.png "$outDir"/"$storyPrefix"_animation.gif

if $verbose ; then
    echo "rm ""$outDir""/frames*.png"
fi
rm "$outDir"/frames*.png