Hi Dan, all. Seems like unfortunately some regressions were introduced in the latest MLT 7.10.0 release.
* the frei0r.cairoblend transition now crashes when rendering with real_time < -1. This is easily reproducible with a simple command, using a png image with alpha : melt color:red out=100 -track alpha.png out=100 -transition frei0r.cairoblend -consumer avformat:test.mp4 real_time=-4 This same command does not crash with MLT 7.8.0 I just discovered this issue and have not yet looked into how to solve this. * the qtblend transition largely used in Kdenlive incorreclty disabled compositing when the top b-frame was opaque even if a rescale of the image was requested (for example scaling top image to 50%), breaking compositing in some cases. I fixed it in commit d7d2e9b Anyways, I think it would be nice to fix the cairoblend crash and release 7.10.1 with the cairoblend and qtblend fixes. Thanks a lot and let me know if I can help. Jean-Baptiste
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