[mythtv-commits] Ticket #13170: Restore realtime priority capability for vsync thread

[MythTV]

#13170: Restore realtime priority capability for vsync thread
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 Reporter:  Doug Larrick <doug@…>  |          Owner:  pbennett
     Type:  Patch - Feature        |         Status:  assigned
 Priority:  minor                  |      Milestone:  30.0
Component:  Ports - rPi            |        Version:  Master Head
 Severity:  medium                 |     Resolution:
 Keywords:                         |  Ticket locked:  0
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Comment (by stuarta):

 Replying to [comment:10 Doug Larrick <doug@…>]:
 > Today I've discovered that part of the reason Std.Dev is larger for RPi
 than for laptop is that VideoOutputOmx::Show takes a variable amount of
 time. The Jitterometer (MythPlayer::output_jmeter) is called after the
 call to Show(). If I move the call to the jitterometer to before the
 call(s) to Show() it reports less jitter overall -- and a (slightly)
 clearer advantage to realtime threads:
 >

 So is the call to output_jmeter misplaced or is it trying to capture
 the jitter including the time it takes to show the frame?

 What is it really trying to measure?


 Regards
 Stuart

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Ticket URL: <https://code.mythtv.org/trac/ticket/13170#comment:12>
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