https://bugs.kde.org/show_bug.cgi?id=361360
--- Comment #32 from Jean-Baptiste Mardelle <j...@kdenlive.org> --- Jesse, thanks for the detailed video. On your remote machine where the slowdown occurs with 2 non transparent clips, can you save the project and open the xml file to make sure it uses the qtblend transition and not the frei0r.cairoblend? (just look for the word "qtblend" in the file, if it is there it means it is used). Otherwise, the slowdown experienced when compositing 2 titles over a video clip is what I expected and I see the same behavior on my machine. The situation will slightly improve when I commit an optimization of MLT's titler module (currently compositing titles is slightly less efficient than compositing png's, my optimization should make titles similar to png's performance). Another possibility is to use the composite transition instead of qtblend. MLT's composite transition is much faster and supports overlaying 3 title clips over a video while keeping a 25fps playback rate. But the drawback of composite is that it has luma bleed (it is fast because it does some approximations), so for example you can see a small blue border around green texts... but maybe we could use composite for timeline and switch to qtblend only for rendering... -- You are receiving this mail because: You are watching all bug changes.
