[mythtv-users] Stutters with 1080i at 25fps H264 AC3 2 channel audio on a 50Hz display live playback.

[Jean-Yves Avenard]

On 10 December 2016 at 09:29, Stephen Hocking <stephen.hocking at gmail.com> wrote:
> Hi all,
>
> One of our TV channels in Australia, ABC20, was recently created as per the
> standard in the subject. It seems prone to stuttering on live playback. The
> system has a Nvidia 610 card (the only passively cooled thing I could find
> at the time) using vdpau vdpau, for playback and a quad core Skylake i5. I
> see messages like
>
> Dec 10 09:01:51 bong mythfrontend.real: mythfrontend[6007]: N CoreContext
> mythplayer.cpp:2176 (PrebufferEnoughFrames) Player(2): Waited 1870ms for
> video buffers AAAAAAAAAAAdLLLL
> Dec 10 09:01:51 bong mythfrontend.real: mythfrontend[6007]: N CoreContext
> mythplayer.cpp:2176 (PrebufferEnoughFrames) Player(2): Waited 1973ms for
> video buffers AAAALAALLAAdAAAA
> Dec 10 09:01:54 bong mythfrontend.real: mythfrontend[6007]: N CoreContext
> mythplayer.cpp:2176 (PrebufferEnoughFrames) Player(2): Waited 102ms for
> video buffers ALLAAAAAdAAADALd
>
>
> When I'm playing back a recording it's fine. When I'm playing back something
> that's in the process of being recorded, it's fine, which seems to rule out
> bandwidth to/from the recording disk (which is NFS mounted) as an issue.

Either the deinterlacing quality is set to high for what is otherwise
a very low power (processing power that is) GPU.

Try the different VDPAU profile.

Otherwise as suggested, pause live TV on startup for a few seconds and
let it continue after. NFS disks aren't very live TV friendly I'm
afraid (I had to set one up one a dedicated link with jumbo frames
active)