https://bugs.kde.org/show_bug.cgi?id=419985

            Bug ID: 419985
           Summary: Crash when changing the project resolution on a busy
                    project
           Product: kdenlive
           Version: 19.12.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: m...@stefannaumann.de
  Target Milestone: ---

Created attachment 127463
  --> https://bugs.kde.org/attachment.cgi?id=127463&action=edit
Crash Log and Backtrace of all threads

SUMMARY
I've finished a 15-ish minute long project with video clips, titles and
transitions (wipe, composite, dissolve) and a blur-effect. When I try to change
the project settings (from in this case 720p59.99 to 1440p59.99), the UI
freezes for a moment, then crashes out. Happened occasionally with several
projects before with the same KDEnlive version.

STEPS TO REPRODUCE
(happens occassionally on a finished project)
1. Have a bigger finished project
2. Project -> Project settings, change the resolution to something bigger (e.g.
2 times of your current project)

OBSERVED RESULT
The UI freezes for a second, then crashes

EXPECTED RESULT
The UI may freeze (or show a progress bar), then return me to the main window
with the properties changed.

SOFTWARE/OS VERSIONS
Linux-Kernel: 5.6.3-arch1
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.2

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