[mythtv-users] Kernel options, Preemption model and Timer frequency

[Hika van den Hoven]

Hoi Rajil,

Saturday, May 12, 2018, 10:49:11 PM, you wrote:

> I am chasing Audio/Video sync problems, and was wondering what are the
> best kernel options for the BE server. Amongst the three preemption
> models (CONFIG_PREEMPT_NONE, CONFIG_PREEMPT_VOLUNTARY, CONFIG_PREEMPT)
> which is the best choice. Likewise for Timer Frequency ( CONFIG_HZ_100,
> CONFIG_HZ_250, CONFIG_HZ_300 and CONFIG_HZ_1000), which is the best choice.

> At the moment on the FE i am seeing errors like so during LiveTV,

> 2018-05-12 15:44:39.163391 N  Player(0): Waited 4177ms for video buffers
> AAAAAAAAAAAUUUUUUUUUUUuLAAAAAAAP
> 2018-05-12 15:44:39.180607 I  Player(0): Video is 11438.3 frames behind
> audio (too slow), dropping frame to catch up.
> 2018-05-12 15:44:39.180639 I  Player(0): Video is 20016.2 frames behind
> audio (too slow), dropping frame to catch up.
> 2018-05-12 15:44:39.180649 I  Player(0): Waiting for video buffers...
> 2018-05-12 15:44:39.281204 N  Player(0): Waited 101ms for video buffers
> AAAAAAAAAAAAAAUUUUUUUUUUuAAAAAAP
> 2018-05-12 15:44:39.321036 I  Player(0): Video is 26449.5 frames behind
> audio (too slow), dropping frame to catch up.
> 2018-05-12 15:44:39.321056 I  Player(0): Waiting for video buffers...
> 2018-05-12 15:44:39.325482 I  Player(0): Video is 31274.3 frames behind
> audio (too slow), dropping frame to catch up.
> 2018-05-12 15:44:39.325501 I  Player(0): Waiting for video buffers...
> 2018-05-12 15:44:39.344897 I  Player(0): Video is 29468.8 frames ahead
> of audio,
>                         doubling video frame interval to slow down.

> Thanks

I infer that you have separate back and frontend. What are the specks,
- what else are they doing while you are watching?
- what else is going on on your network?
- how is the health statust of your drives?

Just a few questions to answer first


Tot mails,
  Hika                            mailto:hikavdh at gmail.com

"Zonder hoop kun je niet leven
Zonder leven is er geen hoop
Het eeuwige dilemma
Zeker als je hoop moet vernietigen om te kunnen overleven!"

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