[mythtv] State of Raspberry Pi 2 build

[Mike Bibbings]

On 10/02/16 03:06, Peter Bennett wrote:
> On 02/09/2016 01:20 PM, Mike Bibbings wrote:
>> On 31/01/16 12:35, Piotr Oniszczuk wrote:
>>>> Wiadomość napisana przez Mike Bibbings<mike.bibbings at gmail.com>  w
>>>> dniu 30.01.2016, o godz. 13:47:
>>>>
>>>> I have just tried MiniMyth2 and it works reasonably well against my
>>>> mythbackend 0.28pre with DVB-S/S2 and DVB-T/T2 tuners (I am in the
>>>> UK using Freest and Freeview).
>>> Mike, thx for Your time spent on MM2!
>>>> The main issue I have is with HD (H264), both LiveTV and recorded
>>>> programs in that there is some jitter, even with OSD renderer set to
>>>> softblend (in openmax profile), if set to opengl2 HD is totally
>>>> unusable. SD live TV  and recorded programs are ok.
>>> Yes. This seems to be key issue now.
>>> For me this is show stopper.
>>> Main Q for me is: is RPI2 support in MythTV actively developed?
>>> I see LVR a bit abandon mythtv devs team.
>>> This is big loose for project :-(
>>>> These results are comparable to my RPI2 build  on Debian Jessie
>>>> (x86_64) using  Lawrence Rust mythbuild.sh system.
>>> This is v. good message for me.
>>> So now I know how to build whole OS to have working mythtv on RPI2.
>>>> Although under RPI2 Raspbian Jessie only xcv works for me (eglfs seg
>>>> faults at startup).
>>> I believe it is Qt build issue on Jessie.
>>> I spent over week to understand how to do this correctly on ARCHLINUX.
>>> (BTW: On original ArchLinux ARM nothing works. FE segfaults or hangs
>>> on startup)
>>>> Meg (Red Button) services work, but  live TV  stutters very badly
>>>> even using softblend.
>>> I think - again - this is OSD rendering issue.
>>>> The good news is that Mythbrowser (Web) and MythNews (News Feeds) do
>>>> work (I believe this is due to later QT5 version than in Lawrence
>>>> Rust build which uses 5.4.0).
>>> I believe all functions should work OK in MM2 (albeit I not tested
>>> every one of them ;-) )
>>>> I tried to change to Steppes theme, but download failed in Theme
>>>> Chooser. Steppes (2.17) did work when I installed it manually from
>>>> git. Changing theme does work in Lawrence Rust build.
>>> I’ll look on this. Probably interference with some of my patches…
>>>> I am  a bit confused about tar v bsdtar. The --numeric-owner option
>>>> only seems to apply to tar, not bsdtar. The image I created was done
>>>> as root on Debian Jessie (x86_64) using tar with the —numeric-owner
>>>> option.
>>> I’m confused here. If user unpacks archive in terminal window as root
>>> - all should be OK without any —numeric-owner option.
>>> I’m doing this routinely in Fedora23 VM
>>> br
>>>
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>> Piotr,
>>
>> Lawrence Rust is still working on improving playback on RPi2.
>> There are some patches to mythtv master (not on github yet) which may
>> assist you, in particular patch
>> 0308-VO-Threaded-softblend-OSD-rendering.patch from
>> http://softsystem.co.uk/download/mythtv/mythpatches-0.24.tar.bz2.
>>
>> I did a quick and dirty build with just this patch and it does improve
>> playback in xcb, less jerkiness when displaying information on screen
>> whilst in live tv.
>>
>> There are some other patches in which may be relevant, I did try
>> applying all of the Lawrence Rust patches to mythtv master but
>> building using mythbuild.sh failed (I think a number of the patches
>> are not longer needed)
>>
>> Mike
>>
>>
> I tried the OSD patch and it is still jerky. I do not think that it has
> helped.
>
> You cannot install all of Lawrence's patches. Some have conflicts, some
> are already installed and many are nothing to do with Raspberry PI. I
> have selected a couple of the relevant ones and fixed some errors in
> them for the two tickets I am working on.
>
> I am unable to run with EGLFS. On startup it displays the theme
> background and then fails with a seg fault. Then the console is locked
> and I have to reboot.
>
> Peter
>
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Console lockup can be fixed without reboot (info from Lawrence) if 
keyboard is attached by

  alt-sysrq-r

The patch (0308) does improve xcb performance on my system, it is still 
jittery but less so. I am in UK with HD h264. The Playback data on 
screen display goes from around 11 FPS without the patch to 16 FPS with 
the patch for Live TV, but it does have someway to go as FPS should be 
25. This is with Video 1920x1080i at 25.00fps. eglfs still seg faults on 
startup

I have also done a bit more testing on MiniMyth2.

With eglfs I can get pretty good HD h264 live TV and video playback with 
OSD render set to opengl, rather than softblend, by overclocking :
boot_delay=2
arm_freq=1000
core_freq=500
h264_freq=500
isp_freq=0
v3d_freq=500
avoid_pwm_pll=1
sdram_freq=500
over_voltage=2
force_turbo=1 (Disables throttling.)
temp_limit=80 (Temperature limit. Used for testing / fail safe.)

Playback data shows FPS around 25 (varies 23 to 27),  again for 
1920x1080i at 25.00fps

I also tried xcb (after installing X) on MiniMyth2, similar results as 
before ( the overclocking above makes little or no difference), opengl 
OSD not good - stutters, softblend -  much better, but still jitters.

For me eglfs is better than xcb on MiniMyth2, but all my TV's can be set 
to disable overscan

Mike