https://bugs.kde.org/show_bug.cgi?id=461920

            Bug ID: 461920
           Summary: parallel processing crashes render
    Classification: Applications
           Product: kdenlive
           Version: 22.08.3
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: co...@matthewbriancohen.com
  Target Milestone: ---

SUMMARY
***
Enabling parallel processing in a video render crashes the render. 
***


STEPS TO REPRODUCE
1.  In the render options for MP4-H264/AAC, click the "parallel processing"
box.

OBSERVED RESULT

The render fails immediately, with the following error:

`free(): invalid pointer`



EXPECTED RESULT

the render completes (faster, as we're using parallel processing), resulting in
a playable video file

SOFTWARE/OS VERSIONS

Operating System: Arch Linux
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7
Kernel Version: 6.0.8-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6600 XT
Manufacturer: ASUS

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