mplayer can't rewind movie

view story

http://www.linuxquestions.org – I have a mp4 file. I opened it with mplayer. It works but when I rewind the movie the picture goes wrong. When scene changes all gets cleared. Unless I rewind, it works ok. I think the file is wrong - compression is to great or sth similar. How can I improve it? Can I alter the file somehow to dispose the problem? PS. if the problem has already occured somewhere, redirect me. I didn't know how to call this problem so I ask here. (HowTos)