avplayer unable to play rmvb video smoothly, the video and audio will out of sync.

Wah, this video converter, took me 5hours++ just to convert a rmvb movie to ipad format, this is really ridiculous to ask us to convert the movie file in such a slow speed, would rather whatch it without convert, still hopeful that someone will create a player that can play most of the video format smoothly.

Actually I have tested using 2 different pc, one is my own Amd quad core and the other is my office intel i5, seem like both also have to take more than 3hours to finish a 1:58.00 hour rmvb movie. But now got another problem, when I trying to copy the movie inside my iPad, the I tunes given warning that my iPad unable to playback the mp4 video, so the copying process stop! What the heck is that? Meaning the iPad original video player unable to support mp4? Seem very funny now?