[mythtv-users] Raspberry Pi Improvements

[Joseph Fry]

On Tue, Aug 9, 2016 at 3:59 PM Peter Bennett <cats22 at comcast.net> wrote:

> On 08/09/2016 01:08 PM, jrh wrote:
> > Nothing I do eliminate the stutter.
> >
> I have not seen the speedup and slowdown problem except with the Dolby
> passthrough. Normally if there is a slowdown you consistently get video
> behind audio messages. Probably you will have to try the full raspbian.
> Use the latest one from May 2016 and install updates after setting up
> the SD card.
>
> Some other things to try -
>
> For audio playback you can try various ALSA entries from the list, or
> you can try OpenMAX:hdmi. If ALSA is not working you can try using the
> raspi-config advanced audio to force audio to HDMI. Changes you make
> with that will affect the ALSA default but will not affect OpenMAX:hdmi.
>
> Make sure in the audio that you select Stereo speakers and not 5.1 or
> 7.1 - even if you actually have surround speakers.
>
> In setup video playback, try both openmax normal and openmax high
> quality. Do they both give the problem?
>
> I have not tried it with Raspbian Lite. The dependencies in the package
> are based on the normal Raspbian. It is possible that Raspbian Lite is
> missing some OpenGL component and using a software emulation of OpenGL
> instead. That causes problems. The package is designed to look for the
> correct OpenGL libraries but if they are not in the expected place it
> may instead use the emulation libraries. The OpenMAX high quality
> profile uses OpenGL.
>
> Peter
>

I have tried all of the OpenMax vs alsa settings, and manually typed in
ALSA:Default as mentioned on the wiki... I have tried Normal and High video
profiles and tweaking all of the relevant settings... even disabling
deinterlacing made little if any difference with 1080i content.

I do notice that content other than the H264 coming from my HDPVR's seems
fine, so perhaps if I switched to 720p the problem would go away.

I really suspect it is like you say, something in the Rasbian Lite that is
missing.  I will take a closer look at the logs to see if its failing to
detect something (OpenGL, realtime threads, etc).  I know that enabling the
realtime threads option triggers mythfrontend to attempt several different
methods, and its possible that the full Rasbian allows them but Lite does
not?  Either way I will test and report back.

I would greatly appreciate it if you could update the package at some point
to work on Raspbian Lite .  Would make mythtv-light even light-er.  My
complete. mostly working. frontend fits in 1.7GB, which allows me to use an
old 2GB SD card that would be thrown away otherwise.  I have spent exactly
$35 on this frontend (cardboard case and I had cables), sucks dropping $10
on a larger SD card just to store apps that will never be used.
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