On Mon, Aug 02, 2010 at 04:05:38PM -0300, Albert Scholtalbers wrote: > That is Interlaced, and as it moves you have this problem on progressive > screens. > Play it on a TV and it looks ok Or deinterlace using e.g. -vf yadif. Use the man page and/or a search engine to find details (subject has been discussed to death).