[mythtv-users] Recommendations for Myth Frontend on Raspberry Pi?

[Jay Foster]

On 3/14/2017 11:56 PM, Tom Harris wrote:
>
>
> On Mon, Mar 13, 2017 at 9:59 PM, Tom Harris <thom.j.harris at gmail.com 
> <mailto:thom.j.harris at gmail.com>> wrote:
>
>
>
>
>     On Mon, Mar 13, 2017 at 1:12 PM, Peter Bennett <cats22 at comcast.net
>     <mailto:cats22 at comcast.net>> wrote:
>
>
>
>         On 03/13/2017 01:04 AM, Tom Harris wrote:
>>
>>
>>         On Thu, Mar 9, 2017 at 12:46 PM, Phill Edwards
>>         <philledwards at gmail.com <mailto:philledwards at gmail.com>> wrote:
>>
>>
>>
>>             On 9 Mar 2017 16:23, "Tom Harris"
>>             <thom.j.harris at gmail.com
>>             <mailto:thom.j.harris at gmail.com>> wrote:
>>
>>                 There are a bunch of threads, files, etc. for getting
>>                 mythfrontend running on a Raspberry Pi. But, some of
>>                 them appear no longer maintained/updated.
>>                 So, I'm wondering what's the current recommendation
>>                 for a Pi frontend deployment.
>>
>>
>>             This page says it's up to date for 0.28
>>             https://www.mythtv.org/wiki/Raspberry_Pi
>>             <https://www.mythtv.org/wiki/Raspberry_Pi>
>>
>>
>>         I had some time to set up a new Pi3 frontend this weekend. I
>>         basically replicated the same experience from when I tried a
>>         little more than a year ago.  1080i was still not usable for
>>         me.   It seems like others have this working.. what am I missing?
>>
>>         My experience was:
>>
>>         1. Spent a lot of time debugging.  This is a recurring theme
>>         in my long experience with MythTV.  I got random frontend
>>         hangs, which I thought were related to video decoding.  But,
>>         after much debugging got it down to the "query_cache"
>>         settings in MySQL.  Once I disabled that the frontend became
>>         reliable.
>>
>>         2. US Broadcast MPEG2 @ 720P works great.
>>
>>         3. US Broadcast MPEG2 @1080i does not work well.   I get
>>         video playback, but with frequent audio hiccups and some
>>         video hiccups.  The default de-interlacer setting of
>>         'Advanced (HW)' was quite bad. When I changed it to "Fast
>>         (hw)' it worked much better -- but still had audio/video hiccups.
>>
>>         MythTV version: 0.28 (up-to-date frontend and backend)
>>         Video Settings: OpenMax normal,  Decoder: Openmax, renderer:
>>         openmax, OSD Renderer: OpenGL; Primary deinterlacer: Fast(HW)
>>         MPEG2 license enabled: verified by command line and CPU load
>>         during playback
>>         Output: HDMI @ 1080P on 4K TV
>>
>>         Any tips on reliable 1080i MPEG2 playback?
>>
>>
>
>         Did you look at the "System Performance" section in the
>         Raspberry Pi Page?
>         https://www.mythtv.org/wiki/Raspberry_Pi
>         <https://www.mythtv.org/wiki/Raspberry_Pi>
>         If you still have a problem, try running with -v playback. See
>         if there are any audio sync errors or other messages displayed.
>
>
>
>     Thanks!  I re-read that and spent some more time getting the
>     Alsa:Default working.   I had gotten static with that before and
>     switched to OpenMax:hdmi.   I switched to Stereo and made sure all
>     the DD/DTS/etc. options were disabled and Alsa:Default now  works
>     and 1080i MPEG2 playback is smooth.
>
>     With the Pi3, the UI is quite responsive.  I'll definitely be
>     giving this a try to replace LibreElec/Kodi that I've been using
>     for the last year.
>
>
> A couple more notes on further testing:
>
> - I had a few crashes of the frontend - but, after looking at the logs 
> I found that it was actually the kernel oom (out of memory) killer 
> killing mythfrontend.
>   - I changed the GPU memory from 256MB to 128MB for some more head 
> room and playback is fine.  Is there any reason to believe this will 
> be a limitation?  The performance tips in the wiki recommend 256MB and 
> increasing to 320MB if playback was not smooth.
>
> - I tested several themes earlier and I'm guessing that contributed to 
> the oom kills. I switch to a simpler 720p theme and the frontend 
> memory usage seems reduced.
>
>
>
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Not sure if this is relevant to the Pi3, but I ran into a recent kernel 
bug with Ubuntu 16.04 that caused the OOM killer to do its thing when 
there was plenty of RAM and swap space available 
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1655842).
Jay
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