[mythtv-commits] Ticket #13176: AVsync is broken at high playback speeds in some streams

[MythTV]

#13176: AVsync is broken at high playback speeds in some streams
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 Reporter:  Brad Martin <mythtv@…>   |          Owner:  pbennett
     Type:  Patch - Bug Fix          |         Status:  assigned
 Priority:  minor                    |      Milestone:  30.0
Component:  MythTV - Video Playback  |        Version:  0.28.1
 Severity:  medium                   |     Resolution:
 Keywords:                           |  Ticket locked:  0
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Comment (by mythtv@…):

 The problem is not jerkiness, rather the video is surging well ahead of
 the audio, as you can see in the mkv recording.  I have been fighting this
 issue regularly for six months or longer, so it is neither a new problem
 nor is it exclusive to highly specific videos.  The problem happens on two
 different machines for me, both running the same myth version.  Both of my
 machines seem to be using "usleep+busy wait" as the sync method, however a
 brief test using RTC timing showed no difference.  Both machines are
 running Ubuntu 16.04 with NVIDIA graphics.  The first machine is using the
 VDPAU High Quality playback profile.  The primary deinterlacer is
 "Advanced (2x HW)", and the fallback is "Advanced (1x HW)".  The second
 machine (the one the mkv was captured on) is using the OpenGL High Quality
 profile, with "Greedy HighMotion (2x)" and "Greedy HighMotion"
 deinterlacers.

 I don't believe a CPU limitation could explain the video surging *ahead*
 of the audio in this manner.

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Ticket URL: <https://code.mythtv.org/trac/ticket/13176#comment:8>
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