[mythtv-users] Stutter playback 720 60fps

[Kevin Johnson]

On Mon, Nov 14, 2016 at 2:53 PM, Kevin Johnson <iitywygms at gmail.com> wrote:

> On Nov 14, 2016 1:19 PM, "Peter Bennett" <cats22 at comcast.net> wrote:
> >
> > On 11/14/2016 03:59 PM, Kevin Johnson wrote:
> > > I have tried all the tuners.  (HDHR PRIME)  Does not matter which
> > > tuner I use.
> > >
> > > I dont think its a hardware issue since I never see this issue while
> > > using Kodi for playback.
> > > This happens on two different frontends using different hardware.
> > > Albeit they do both use nvidia.  But I have tried slim, as well as
> > > vappi and other configurations.  Nothing changes the result.
> > > I would point at the backend or hardware if this occurred on Kodi.
> > > But it does not.
> > > I usually find solutions by searching and searching.  But it seems I
> > > am the only one with this issue.
> > > Pressing pause for a split second clears everything up.  So I can live
> > > with it. It just bums me that .27 worked awesome, but since the
> > > upgrade to .28 its been a bug chasing extravaganza.
> > >
> > > Its probably not possible, but can I use .27 frontend with a .28
> > > backend?  Most likely not but it would be good for testing.
> > >
> > Sorry you cannot use a 0.27 frontend with 0.28.
> >
> > Note that it is normal for a few seconds of stopping and starting with
> > live TV as the frontend can start ahead of where the backend is. That
> > would normally clear up after a few seconds, or if you pause for a
> > couple of seconds. If you just leave it running for a few minutes does
> > the stuttering continue unabated? If it does it surely gets behind. If
> > you press I do you see it getting further behind with time?
> >
> > If you are not getting further behind I wonder if you are getting it
> > into time-stretch mode, speeded up. If you did that it should reset time
> > stretch as soon as it catches up with the current time, but maybe that
> > is not happening correctly.
> >
> > Peter
>
> It continues until I do something. I let it go for 2 mins the other day
> just to see.  From the playback info window. It is constantly right around
> -3 behind. It never changes. I see from -v playback info that frames are
> being dropped to catch up. But it never catches up. Just continuous dropped
> frames.
>

After further investigation, I think this delay may be happening on 1080i
framerate also.  Its just not as obvious.  But looking at the playbackdata
while watching live tv, I see the the A/V Sync is always around -3 when
starting.  Once I hit pause, the sync is around .01
so the a/v sync is not "correct" at startup of live tv.   After hitting
pause, the 'lips match the sound' sort to speak.
Not sure if that is relevant or not.

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