[mythtv-users] Stutter playback 720 60fps

[Kevin Johnson]

On Mon, Nov 14, 2016 at 3:58 PM, Kevin Johnson <iitywygms at gmail.com> wrote:

>
>
> 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.
>
> Just some more info.  In the playback info screen.  When the live tv image
is stuttering, Available Buffer is 0% of 16mb.  Once I hit pause that never
goes below 2% even if I try to fast forward to the "closest to live moment"
if that makes any sense.

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>
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