[mythtv-commits] Ticket #13579: Audio sync lost when forwarding & rewinding

[MythTV]

#13579: Audio sync lost when forwarding & rewinding
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 Reporter:  bib1963               |          Owner:  (none)
     Type:  Bug Report - General  |         Status:  infoneeded_new
 Priority:  minor                 |      Milestone:  needs_triage
Component:  MythTV - General      |        Version:  Master Head
 Severity:  medium                |     Resolution:
 Keywords:                        |  Ticket locked:  0
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Comment (by mark-kendall):

 Replying to [comment:4 bib1963]:
 > Here's another log when running "mythfrontend -v all".
 >
 > It's showing a 24m30s video ripped from a dvd.
 >
 > At the time I am running 'make MAKE="make -j4"' on a linux kernel build.
 >
 > This is on a 2c4t i3-4160 CPU @ 3.60GHz.
 >
 > Less than 3 minutes into it, audio sync was lost, with audio always
 ahead of video.
 >
 > The more concurrent jobs on the linux kernel build, the worse and
 quicker the sync loss.
 >
 > Even if you then kill the linux build, the video never catches up with
 the audio.
 >
 > It only seemed to start when the hardware interlacing was pulled into
 master.

 OK - from the logs, you're using FFmpeg decoding and FFmpeg software
 deinterlacing.

 What happens if you disable deinterlacing?

 What happens if you enable shader deinterlacing in the video display
 profile code? (You'll need to go into the guts of the display profile
 settings pages to find 'Prefer OpenGL deinterlacers' settings for single
 rate and double rate)

 Alternatively, is VAAPI usable on that system? Looks like it is failing
 for some reason.

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Ticket URL: <https://code.mythtv.org/trac/ticket/13579#comment:5>
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