[Bug 311067] New: video playback shutters (is jerky?!) when enabling destop effects

[bbutscheidt at yahoo.de]

https://bugs.kde.org/show_bug.cgi?id=311067

            Bug ID: 311067
          Severity: minor
               URL: https://bugs.freedesktop.org/show_bug.cgi?id=45674
           Version: 4.9
          Priority: NOR
          Assignee: unassigned-bugs at kde.org
           Summary: video playback shutters (is jerky?!) when enabling
                    destop effects
    Classification: Unclassified
                OS: Linux
          Reporter: bbutscheidt at yahoo.de
          Hardware: Unlisted Binaries
            Status: UNCONFIRMED
         Component: general
           Product: kde

When I enable "System Settings // Desktop Effects // General // Enable desktop
dffects on startup" every video playback (e.g xine with vdpau or vlc not using
vdpau) suffers from the same problem:
the picture doesn't move smoothly, at least every one or two seconds the
picture seems to stop for a nearly not noticeable moment and then quickly jumps
over the lost frames to the current one.
The audio doesn't seem to be affected.

I can find hints like the one in the URL box in www that other people notice
this too - but nothing here so I just want to drop a notice.

On my machine, this problem came with KDE 4 and the introduction of desktop
effects in general, so I had them deactivated. Just gave it a try with new
4.9.3, but the problem is still there.

By the way: looking at a cpu-Monitor the CPU seems to be at ease.

Reproducible: Always

Steps to Reproduce:
1. Enable OpenGL (Desktop Effects)
2. Play a video with xine/ vlc (x-driver seems to be of no relevance) - 

Actual Results:  
playback shutters/ shivers/ shortly hangs

Expected Results:  
Playback should look like when OpenGL (Desktop Effects) are disabled


I am using nvidia-drivers - but I don't know if this is of relevance here

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