[mythtv-users] [mythtv] Raspberry Pi playback smoothness patches

Doug Larrick doug at parkercat.org
Sun Nov 5 16:17:44 UTC 2017


On Sun, 2017-11-05 at 16:00 +0000, Paul Gardiner wrote:
> On 05/11/2017 12:43, Doug Larrick wrote:
>  > ...
> > 
> > I have been doing some work recently to improve the smoothness of
> > playback on Raspberry Pi. I have two small patches which I have
> > prepared for your consideration.
> 
>  >
>  > ...
> 
> Sounds wonderful. I'd love to swap over to using a RPi, but when I
> tried using one recently, it just wasn't quite there for 1080i
> content.
> 
> Do you think your patches will rebase onto 0.28 cleanly?

They should apply fine to 0.28. 

A couple of things to note:
* I'd definitely recommend a Raspberry Pi 3
* Refer to https://www.mythtv.org/wiki/Raspberry_Pi , some good tips
there.
* GPU memory definitely needs to be 256MB for 1080i content.
* To use realtime priority, it needs to be enabled for a group your
frontend user belongs to in /etc/security/limits.conf .
* Memory can be a problem on RPi especially with GPU consuming a
quarter of the Pi's RAM. Run as few other processes as possible,
certainly not a desktop environment; I don't even run with a window
manager anymore. 

-Doug
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