On Sat, May 15, 2010 at 02:25:29AM -0300, D?niel Fraga wrote: > So I don't understand why MPlayer shows artifacts with this one > and not with the remuxed one. For MPEG-4 there is the issue that our splitter code accidentally merges the first frames, causing one P-frame to be dropped and the others using the wrong refernce frame. Might be the same happens for MPEG-2. The typical effect is that when there is motion, everything is a bit messed up and all gets fixed at the next keyframe.