https://bugs.kde.org/show_bug.cgi?id=430315

            Bug ID: 430315
           Summary: Can't start preview with PIP-jog/png
           Product: kdenlive
           Version: 20.04.2
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: uffe_nordh...@yahoo.com
  Target Milestone: ---

SUMMARY
I have two video tracks, one main and one that is used for picture-in-picture
info. I can start playing the combined video outside the PIP-segment, but if I
start playing the combined video in the PIP segment, KDEnlive crashes.

STEPS TO REPRODUCE
1. Set up a project with some video tracks. I have two video tracks and four
audio tracks (audio of main video track i constantly muted)
2. Place a video segment in one video track

3. Place a PNG/JPG-picture in another video track, and use transform to shrink
it and place it in the right spot on screen

4 Click the project time line to place the cursor (is it called something
else?) after inserting the PIP but before it is removed.

5 Click the play button on the project screen playback.

OBSERVED RESULT
KDEnlive crashes, if run as normal. When I tried running it from gdb (as per
instructions on this page https://kdenlive.org/en/bug-reports/ ) it does not
crash but instead freezes and becomes unresponsive to any user input.

EXPECTED RESULT
Playback should proceed as normal.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Opensuse 15.2, 
(available in About System)
KDE Plasma Version: Plasma 5.18.5
KDE Frameworks Version: 5.71.0
Qt Version: 5.12.7

ADDITIONAL INFORMATION
If I start previewing the project before the PIP insertion, KDENlive does not
crash. The project will render as I expect it to.
If you cannot reproduce the bug, I can send you my project file. For me it is
reproducible without exception. If you want my project file send me an email
and I will send it.

The project contains:
- one video track used for Picture-in-Picture, with no attached audio
- one "normal" video track, with it's audio turned off. I use this track to
show a JPG covering the entire screen, without problem (the video is
specifically cut around this picture)
- one audio track with narration
- two additional audio tracks with sound effects

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