title: How to fix fps/duration information in MJPEG File
body: <p>I have a set of MJPEG .avi files which were logged as being at 25fps, but were actually recorded slightly slower than this, so they're timing is wrong (they show up as being about 2 minutes shorter than the actual recording). I know the true duration of recording - how can I set the duration of the file to that, without re-encoding?</p>