[mythtv-commits] Ticket #13369: Playback issues with 30Hz display

[MythTV]

#13369: Playback issues with 30Hz display
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     Reporter:  paulsd                |      Owner:  (none)
         Type:  Bug Report - General  |     Status:  new
     Priority:  minor                 |  Milestone:  needs_triage
    Component:  MythTV - General      |    Version:  v29.1
     Severity:  medium                |   Keywords:
Ticket locked:  0                     |
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 I'm using MythTV 2:29.1+fixes.20180414.329c235-0ubuntu3 in Ubuntu 18.04.

 I recently got a new 4K TV.  This TV has one HDMI 2.0a port (which
 supports 4K at 60Hz), and three HDMI 1.4 ports (which only support 4K at 30Hz).
 If I connect my MythTV box to the HDMI 2.0a port and configure X to
 display at 4K at 60Hz, then everything works fine.  Unfortunately, only the
 HDMI 2.0a port on the TV supports ARC, so this port needs to be connected
 to my stereo system instead of my MythTV box.  If I connect my MythTV box
 to an HDMI 1.4 port and configure X to display at 1K at 60Hz, then everything
 works fine.

 However, if I connect my MythTV box to an HDMI 1.4 port and configure X to
 display at 4K at 30Hz, then Recordings work fine, but LiveTV playback doesn't
 work.  Specifically, LiveTV video is played at half speed, and only brief
 clips of audio are occasionally played.  The same symptom occurs using any
 of the accelerated Playback Profiles (my system only supports OpenGL and
 VAAPI, so I can't test VDPAU).  LiveTV plays at half speed even if audio
 is disabled (by setting the 'Audio output device' to NULL in the frontend
 settings).

 If I use a non-accelerated Playback Profile at 4K at 30Hz, then LiveTV plays
 properly, but I have other problems (video tearing and high CPU usage).
 In addition, if audio is disabled (by setting the 'Audio output device' to
 NULL in the frontend settings), then LiveTV still works as expected, but
 Recordings play back at double speed.

 So, something is clearly different about the display refresh rate handling
 for LiveTV vs Recordings, and both are wrong in some cases.

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Ticket URL: <https://code.mythtv.org/trac/ticket/13369>
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