Comment 13 for bug 1134088

I could sort out the last one. It seems to come from the encoding of some clips. I had several clips directly imported from the same camera but the error occurred for the ones where I increased the speed to 8x. I had done this before in other projects with files from the same camera and don't understand why it was happening now.
As a work-around I used ffmpeg in the command line to increase the clips' speed. Anyway I think that encoding problems should not cause the whole program to crash.