[mythtv-users] Livetv stutter

David Birch david.birch at gmail.com
Thu Oct 19 02:38:17 UTC 2017

Ok, so mucking with the secs_min value in ringbuffer.cpp does have some of
the desired effect. I found a setting around 1.4 is a bare minimum to fill
about 1% of the buffer and play all the hd channels i have without issue,
FWIW most seem to be saying they're between 3-8mbps. The side effect is
noticable lag to start, and a much more noticable lag during channel
change. If i push the value up above 2s then channel change seems to break
- video never actaully displays but audio plays after a few secs. This test
was on the i5 nuc i have, will test celeron based one soon.


On Thu, 19 Oct 2017 at 12:22 pm, Nick Morrott <knowledgejunkie at gmail.com>

> On 18 October 2017 at 20:54, Peter Bennett <cats22 at comcast.net> wrote:
> >
> >
> > On 10/18/2017 03:29 PM, Nick Morrott wrote:
> >>
> >> Probably just me - all other frontends are VDPAU. I doubt anyone else
> >> is running a PVR-xx0 analog capture card either nowadays?
> >>
> >> This is a MythTV box that was built in 2006, uses an ATI video card to
> >> drive a large TV via RGB SCART (no digital inputs) and is shipwrecked
> >> on Debian Wheezy due to the UMS/KMS changes in X.org in Jessie+
> >> breaking driving such a low dotclock for the PAL signal.
> >>
> >> And neither the TV nor box will give up...
> >>
> >> Cheers,
> >> Nick
> >
> > You could shell out $50 for a raspberry pi 3 and I expect it will work as
> > well or better - and you can use the latest version of Debian Stretch.
> Out of the box, an RPi would not work at all in this setup. I've
> looked at using a Pi as a drop-in replacement frontend regularly over
> the past few years, and every time it's been "traumatic".
> I currently have, and thus would want the RPi to replicate:
> i) PAL 576i video output terminating in RGB SCART (not composite, not
> YPbPr)
> ii) digital audio over Toslink to an AV receiver
> Video ouput could possibly be handled via an HDMI->VGA adapter, a
> VGA->RGB SCART cable with composite sync, and a suitable 576i
> modeline. The recently-available VGA666-type GPIO boards looked like a
> possibility but have limitations in the signals they can generate.
> HDMI->SCART adapters on ebay are only ever generating composite or YUV
> video, neither of which are suitable.
> Digital audio support on the Pi would need either a GPIO-based digital
> audio board, or an inline HDMI audio splitter to provide a TOSlink
> connector.
> At the moment, getting the frontend to work properly (not trying to
> start playback until it has enough buffered video) seems like a more
> realistic prospect :)
> I shall work on getting 0.29 built on Wheezy and have another look a
> the playback code  to see what else I can poke.
> Cheers,
> Nick
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