https://bugs.kde.org/show_bug.cgi?id=469291

            Bug ID: 469291
           Summary: Using GoPro external proxy clips prevents rendering
                    and corrupts the project
    Classification: Applications
           Product: kdenlive
           Version: 23.04.0
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Effects & Transitions
          Assignee: j...@kdenlive.org
          Reporter: kde.eo...@simplelogin.com
  Target Milestone: ---

Created attachment 158641
  --> https://bugs.kde.org/attachment.cgi?id=158641&action=edit
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

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