[mythtv-users] Gappy playback of some DVB-T recordings

[Justin Hornsby]

Hi all.

I'm having problems playing back some DVB-T recordings.

All the recordings I've seen the issue with are from BBC channels in the UK.

My frontend is based on minimyth, running version 0.20-19.  Backend
can play back the recordings just fine.

With XvMC and deinterlacing enabled (the issue never shows when I
don't deinterlace), every 20 seconds or so the playback pauses a
little & I notice a slowdown of playback & hear a gap in the audio.

When timestretch is enabled (1.05x say) I don't get the problem.  When
deinterlacing isn't enabled (the method doesn't seem to matter), I
don't get the problem either.

When I use mythfrontend -v playback I see stuff like

 NVP: Video is 5.29265 frames ahead of audio, doubling video frame
interval to slow down.

.. around the kind of time interval the gaps in audio come about.

mythfrontend -v all shows me lots of messages about so many audio
buffers being needed when only so many are available, and plenty of
messages about a broadcast saying they're available.

I've tried every audio buffering setting & playback option possible -
all with the same result.

My backend can play back all the recordings just fine using nvidia
xvmc & deinterlacing, so I know it's not the recordings themselves to
blame - the problem is with the frontend machine somewhere, whether
that be with drivers, config or mythtv itself.

Does anybody have any ideas what's going on or have anything else I can try?

Justin
-- 
Justin Hornsby
Moderator of www.mythtvtalk.com and MythTV advocate.
email: justin(dot)hornsby(at)gmail.com
web: http://www.juski.co.uk