Created attachment 158641 [details] A tar.gz file which contains a project file before and after adding the video clip to the timeline. The before file is not corrupted, but the after file is. SUMMARY I have been trying to learn how to do some basic editing on Kdenlive, but I have been running into corruption issues with my project by the time I am ready to render. I can reliable reproduce the corruption by enable external GoPro proxy clips and then enabling the proxy clip on a single source file. I don't believe the issue was as bad a few weeks ago when I was messing around with it on vacation, but I could be wrong about that. STEPS TO REPRODUCE 1. Start new project 2. Enable external proxy clips for GoPro videos 3. Add a single source file (4k GoPro video) 4. Enable proxy clips for that single source file 5. Drag the source clip into the timeline OBSERVED RESULT The video monitor works fine and I can scrub through the project, but rendering the project causes the output to be a single word: "INVALID". Saving, closing, and re-opening the project causes the following error message: "Could not recover corrupt file." EXPECTED RESULT The video renders using the source file and see no errors when re-opening the project file. SOFTWARE/OS VERSIONS Linux: Fedora-Workstation 6.2.13-100.fc36.x86_64 KDE Plasma Version: 5.27.4 KDE Frameworks Version: 5.104.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION * Only after adding the video to the timeline does the project corrupt. The corruption can be reproduced while the video files are on a local and remote filesystem (NFS). * Generated proxy clips do not corrupt the project