Hello! I'm using KDE Mandriva 2009. and Kdenlive 0.7.
Problem goes like this: i made the movie as i wanted it, but now i want to export it. But, when i render it, created file is 1 or 2MB large even though its a 15minutes movie. When i open that file, only thing I see is first scene for one second, and then it stops, or it crashes.
Any idea how to fix this?

How did you played the rendered file? With which software?
Try ffplay "filename"
It could be your format is too compressed for your system, and too much resources are needed.
Only the first second is decoded properly.
Please give more information about your hardware config and the video format used.