Created attachment 188209 [details] Screenshot: kdenlive 25.12.0 Timeline and effects with selected frame rendering fails on. SUMMARY Initial Video is longer. Render always crashes at same position/frame. To show Bug: rendered (tried to) only problemmatic part. STEPS TO REPRODUCE 1. Render Video with effects OBSERVED RESULT Render crashes (after Waiting about 1 Minute to start rendering - due to project size) EXPECTED RESULT Rendered Video OS VERSIONS Windows 10 Version 22H2 Build 19045.6456 Debugging-information: Kdenlive: 25.12.0 - rev. 8ed1d6b MLT: 7.35.0 FFmpeg: Package Type: Unknown/Default Qt: 6.10.1 (built against 6.10.1 x86_64-little_endian-llp64) Frameworks: 6.20.0 System: Windows 10 Version 22H2 Kernel: winnt 10.0.19045 CPU: x86_64 Windowing System: windows GPU: Movit (GPU): disabled Track Compositing: qtblend ADDITIONAL INFORMATION initially created in 23.x (forgot which version) (newver rendered this version) -> upgraded to latest (25.12.0) (not rendered) -> downgrade to 24.02.2 Version change due to a different Bug/Problem with Performance, what turned out to be a issue with the AMD Chipset-driver 24.02.2 - first time render failed. then Also installed versions: 23.08.5 25.12.0 (again) 23.04.3 -- All render failed. (25.12.0) render log: video_1080p_h0x6.mp4.log ``` Started render process: D:/Programme/kdenlive25/bin/melt.exe -loglevel error -progress2 C%3A%2FUsers%2Fusername%2FAppData%2FLocal%2FTemp%2Fkdenlive-xxVswP-1.mlt 60 5 1 61 10 2 62 20 4 Rendering of C:/Users/Der_Mueller/Videos/video_1080p_h0x6.mp4 aborted, resulting video will probably be corrupted. Frame: 20 ``` (23.04.3) Render log. Same as 25.12.0 but also multiple like: [mov,mp4,m4a,3gp,3g2,mj2 @ 0000019388950040] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000 [mov,mp4,m4a,3gp,3g2,mj2 @ 0000019388950040] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000. -- no other msg. A little testing: (in 23.04.3) Effect Median is the Problem. The Frame it failes on: Planes: U Spatial sigma: 81,870 Median vertical radius 121,740 Median percentile: 0,766 (The second Median effect: Blue/UV - just works) Info to Attachment: screenshot of problematic part. (blue part selection) exact frame where render failes selected. To mention: there is no key set (keyframe) on the frame the render failes