On 29/01/2020 11:28, Mark Kendall wrote:
> On Wed, 29 Jan 2020 at 09:30, John Pilkington <johnpilk222@gmail.com> wrote:
>> Hi Mark: This is my main FE/BE system, which has always run the
>> frontend in a window. Output to the TV is via DLNA or NAS. It's an old
>> office machine with no extra graphics hardware.
>>
>> Linux version 4.4.211-1.el7.elrepo.x86_64
>>
>> Hewlett-Packard HP Compaq dc5800 Microtower/2820h, BIOS 786F2 v01.60
>> 10/26/2015
>
> John
>
> To be honest, I'm confused - but first some background.
>
> I'm assuming that this commit is causing your problems:-
>
> https://github.com/MythTV/mythtv/commit/104cad9911d55734988075e5244d5436cb27ec48
>
> which will 'encourage' Qt to try and use EGL for its OpenGL interface
> - rather than GLX.
>
> So I need to check whether it is indeed causing the issue - and if so,
> how best to work around it, preferably in a generic manner.
>
> As explained in the commit/code, we need to force EGL before we do any
> kind of Qt GUI initialisation. We don't have a window to check the
> OpenGL/EGL vendor/version, a Qt platform name - or pretty much
> anything else to give us a hint about the best approach. So I check
> directly with EGL and at the moment it just rejects anything nvidia -
> which causes problems - and we don't currently need EGL with nvidia.
>
> I can (and will) restrict the use of EGL for any mythtv GUI
> application that doesn't explicitly need EGL (i.e. mythtv-setup). It
> may also help to reject older versions of EGL - which is easy enough
> to check for. But failing that, I would need to add further
> restrictions based on the vendor string - but if the vendor is intel
> or mesa, then that will cause major issues - as that is the major
> target platform.
>
> So with that in mind, your glxinfo output reports accelerated, intel
> support but your mythfrontend log extract from the earlier version
> shows it is using some form of emulation. I don't understand that.
>
> I'm assuming you are not using any form of containerisation, virtual
> machine or are remotely logged in? The actual driver in use is fairly
> critical here.
mesa-libEGL looks like a standard el7 package, last patched by redhat in
2019 April. See below for more packages... Bare metal install.
>
> Can you run the latest master version with this environment variable set:-
>
> MYTHTV_NO_EGL=1 mythfrontend
>
> and see if that helps.
I haven't done this yet. For my earlier posts I hadn't tried starting
the frontend; only mythtv-setup, which uses the display options created
in an earlier run of the frontend.
With the older installation:
[john@HP_Box ~]$ MYTHTV_NO_EGL=1 mythfrontend -v playback
2020-01-29 13:17:32.939267 C mythfrontend version: HEAD -> master
[v31-Pre-0d3bb87db71] www.mythtv.org
2020-01-29 13:17:32.939281 C Qt version: compile: 5.9.7, runtime: 5.9.7
2020-01-29 13:17:32.939341 I Scientific Linux 7.7 (Nitrogen) (x86_64)
2020-01-29 13:17:37.453854 I Display: Have main widget
2020-01-29 13:17:37.454548 I UI Screen Resolution: 1024 x 576
2020-01-29 13:17:37.606571 I Display: Have main window
2020-01-29 13:17:37.620214 I Display: Found screen 'VGA1'
2020-01-29 13:17:37.717812 I OpenGL: OpenGL vendor : VMware, Inc.
2020-01-29 13:17:37.717821 I OpenGL: OpenGL renderer : llvmpipe
(LLVM 7.0, 128 bits)
2020-01-29 13:17:37.717826 I OpenGL: OpenGL version : 2.1 Mesa 18.3.4
2020-01-29 13:17:37.717832 I OpenGL: Qt platform : xcb
2020-01-29 13:17:37.717873 I OpenGL: EGL display : No
2020-01-29 13:17:37.717878 I OpenGL: EGL images : No
2020-01-29 13:17:37.717882 I OpenGL: Qt OpenGL format : OpenGL 2.1
2020-01-29 13:17:37.717887 I OpenGL: Qt OpenGL surface : RGBA: 8880
Depth: 0 Stencil: 0
>
> Can you also paste the full output of 'eglinfo'. Hopefully there is a
> package available for that on your system. On debian/ubuntu etc it is
> available through mesa-extra-utils. That will give helpful information
> on whether EGL is available and what version etc.
These packages are installed now. egl-utils wasn't. The attached
eglinfo.txt was created without a post-install reboot.
[john@HP_Box ~]$ rpm -qa | grep -i egl
libglvnd-egl-1.0.1-0.8.git5baa1e5.el7.x86_64
freeglut-3.0.0-8.el7.x86_64
mesa-libEGL-18.3.4-5.el7.x86_64
egl-utils-8.3.0-10.el7.x86_64
libwayland-egl-1.15.0-1.el7.x86_64
mesa-libEGL-devel-18.3.4-5.el7.x86_64
[john@HP_Box ~]$
>
> And finally - are you actually using this machine for video playback?
Yes. This box has only DVB-T tuners, so it records only in SD, but I
have a few HD files on it and all playback in the frontend window seems
to be of generally acceptable quality. But there is no direct video
output to the TV, so the wow-factor is perhaps low.
> I'm trying to understand whether 'Output to the TV is via DLNA or NAS'
> is a red herring.
>
> Thanks and regards
> Mark
