On Thu, 3 Jan 2008 19:51:11 +0000 vdmsss <vdm_sss at yahoo.co.uk> wrote: > The file produced by mencoder is in synch, but the video stream > jitters back on forth in time when I play it in QT (with mplayer, > ffplay, VLC, it plays just fine). Mencoder has a very well-known problem using -of lavf with b-frames. If you avoid them, it works fine.