https://bugs.kde.org/show_bug.cgi?id=439355

            Bug ID: 439355
           Summary: Upon making changes to a project I have spent several
                    hours on, kdenlive freezes and then crashes
           Product: kdenlive
           Version: 21.04.2
          Platform: Appimage
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: vi.ku...@protonmail.com
  Target Milestone: ---

Created attachment 139774
  --> https://bugs.kde.org/attachment.cgi?id=139774&action=edit
An affected project file

SUMMARY
Upon making changes to a project I have spent several hours on, kdenlive
freezes and then crashes.

STEPS TO REPRODUCE
1. Start kdenlive
2. Open affected project
3. Make any of several changes, including saving the file, applying an effect
preset, adjusting an effect setting, or rendering the file. Rendering the file
results in a several-second delay before the crash occurs.

OBSERVED RESULT
kdenlive crashes

EXPECTED RESULT
kdenlive operates normally

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.12.13
(available in About System)
KDE Plasma Version: 5.22.2
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
This occurs on both the Arch Linux package and with the appimage. With the
appimage, it occurs in both 21.04.2 and 21.04.1. This was first noticed today,
though the last time I worked on the project was one week ago, so the error
began occurring in the past 7 days. Upon crashing, the command line will print
the errors:

terminate called after throwing an instance of 'std::out_of_range'
  what():  _Map_base::at
/tmp/.mount_kdenliKQNSlk/AppRun: line 42: 472285 Aborted                 (core
dumped) kdenlive --config kdenlive-appimagerc $@

Attempting to use gdb shows no debugging symbols, running kdenlive through gdb
anyways and running a backtrace after it crashes gives the message "no stack".

I've attached the project file for inspection, though of course I have not
included the numerous raw video or audio files.

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