Comment 21 for bug 520941

Looks like the code which generates sequence.mlt has a bug which means it doesn't insert single frame gaps between clips (in the case that you've got them in your project). It won't even be visible that you have a single frame gap because when you play the video through it won't appear. This leads to a mismatch between the clip timing and the transition timing (which runs off a different timeline and _will_ have the additional gap).

There's a simple fix in the code though I haven't been able to fully test it yet - a workaround for now would be to extend any clips which have a 1 frame gap before the start of the next clip (though it might be hard to spot them - zerbob there's just such a gap between the second017.jpg and bulldozer.avi clips in the test project you sent).