Originally Posted by Just Alex

Here you go. Takes all videos in current folder and makes flash

for i in *.wmv; do ffmpeg -i "$i" -f flv -ar 22050 -ab 56 -r 25 -b 650k -s 320x240 `basename $i .wmv`.flv; done

then you make screen prints out of all flv files

for i in *.flv; do ffmpeg -i "$i" -an -ss 00:00:03 -an -r 1 -vframes 10 -s 160x120 -y `basename $i .flv`-%d.jpg; done


You welcome.