I'm using the most recent sunab-svn versions of kdenlive and mlt on Kubuntu 12.10, x86-64.
When I apply the speed effect to a clip and set the speed to 200% I observe corrupted frames. For instance, there are black regions or even color noise regions ... which look a lot like memory corruption.
In addition, the new length of a clip is not consistent with project preview, single frame stepping, and rendering. For instance, when playing the clip, the duration as calculated by kdenlive is to long and in consequence, the final game gets repeated several times.
When I play the clip in kdenlive and stop somewhere in between then the frame shown at stop does not match the frame I see when stepping fourth and back again a single frame.
Is there a temporary workaround for the broken speed effect?