Hi Redrocker. Make sure the framerate is set correctly (29.97 or 30 fps, or whatever your device requires). If that is OK, try increasing the overall bitrate. This effect is also sometimes caused by the playback hardware not being able to redraw the screen quickly enough (my cell phone does this in widescreen mode, but plays smoothly in smallscreen mode, from the same file). Playback on my PC using VLC player and the Generic profile is perfect.