https://bugs.kde.org/show_bug.cgi?id=361360
--- Comment #10 from Jean-Baptiste Mardelle <j...@kdenlive.org> --- I am finally close to fixing this issue. Problem is that the track compositing in Kdenlive (and shotcut) uses the frei0r.cairoblend transition. There is one transition between each track, but because of its current design, the transition is performed even if the track had no transparency. So if you put 3 clips on 3 different tracks one above the other, the transition requests a frame for each clip and performs a compositing operation between each track, resulting in the huge framedrop you noticed. I have now written a new transition for MLT (qtblend) that checks if the top frame has transparency and if it does not, it stops here, so there is no performance loss. I am doing the final testing and hope to merge that in MLT and integrate in Kdenlive next week for the 16.08 release. -- You are receiving this mail because: You are watching all bug changes.
