[mythtv-users] Stutter playback 720 60fps

[Kevin Johnson]

On Mon, Nov 14, 2016 at 4:05 PM, Kevin Johnson <iitywygms at gmail.com> wrote:

>
>
> 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.
>

The frontend is now showing this message in the logs.  Many times.  Did not
see them before.

Nov 14 21:48:19 g430 mythfrontend.real: mythfrontend[1757]: W Decoder
avformatdecoder.cpp:4899 (GetFrame) AFD: Audio 3373 ms behind video but
already 220 video frames queued. AV-Sync might be broken.


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>>>
>>
>>
>
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