https://bugs.kde.org/show_bug.cgi?id=406891

            Bug ID: 406891
           Summary: Project monitor/ clip monitor flickers during playback
           Product: kdenlive
           Version: 19.04.0
          Platform: Appimage
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: he_...@yahoo.co.uk
  Target Milestone: ---

SUMMARY
First attempt at 19.04.0 (previously used 18.12.1b) all appimages
loading clips works. Selecting clip to play or inserting into timeline and then
using playback cause unacceptable flickering/stuttering of project/clip monitor
but audio playback is ok. No effects / transitions  


STEPS TO REPRODUCE
1. Open new project HD1080p 30FPS
2. load clip
3. select clip (properties: H.264, AAC, frame rate 30, size 1920x1080)
4. select play

OBSERVED RESULT
flickering display (headache inducing)

EXPECTED RESULT
smooth playback (as with 18.04)

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: XUBUNTU 18.04
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
NVIDIA GT218 (GeForce 210) with driver 340.107

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