Created attachment 138804 [details] Kcash log file SUMMARY Kdenlive crashes on project preview upon reaching fade-out / fade to black. STEPS TO REPRODUCE 1. Created new project 4k60p, added several clips, proxy clips enabled 2. Dragged 2 clips to timeline, added fade-in/out to sound tracks and fade-to-black / from-black on video tracks. 3. Press PLAY button on project preview. OBSERVED RESULT Kdenlive crashes repeatedly as soon as the beginning of the first fade-out / fade-to-black effect starts. EXPECTED RESULT Playback should continue, as observed in 21.04.0 and prior versions. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
I managed to track down the crash to the fade-to-black transition, added directly to the timeline. The fact that I used proxy clips was not related to the issue, as it happened also without using proxies. The fact that I also had 30p footage within the project was irrelevant, as it also occurred with a pure 60p clip collection. The addition of contrast and saturation as master effects was irrelevant to the issue, as it occurred also when not using any master effects (or any effects for hat matter).
I see a thread issue on Linux in the crash log (but I'm not a specialist). If not already done, please try with the current Kdenlive AppImage version 21.04.1 to see if there are any packaging issues https://download.kde.org/stable/kdenlive/21.04/linux/
Dear emohr, Thank you for your advice. I haven't had the opportunity to test the AppImage, but I found out that if I disabled the feature that reduces the resolution on the playback video window, the crash would not occur. We are therefore dealing with a combination of fade-out effect AND scaling of the preview window.
Is this still reproducible in newer versions? I was not able to reproduce it myself. It looks like the code in MLT (filter_brightness.c:55) was rewritten around that time and it's possible the bug was fixed.
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The bug seems to be fixed in the meantime (22.04.3).