[mythtv-commits] Ticket #13579: Audio sync lost when forwarding & rewinding
MythTV
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Thu Feb 13 11:31:47 UTC 2020
#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.
--
Ticket URL: <https://code.mythtv.org/trac/ticket/13579#comment:5>
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