Van pics naar movie: https://www.ffmpeg.org/faq.html#How-do-I-encode-single-pictures-into-movies_003f
De korte versie:
cat *.jpg | ffmpeg -f image2pipe -c:v mjpeg -i - output.mpg
Van movie naar pics: https://www.ffmpeg.org/faq.html#How-do-I-encode-movie-to-single-pictures_003f