[mythtv-users] OpenGL render problems with radeon and 0.24.1

[Douglas Peale]

On 06/09/2011 06:22 PM, Mark Kendall wrote:
> On 9 June 2011 05:47, Greg <dargllun at googlemail.com> wrote:
>> Am Wed, 8 Jun 2011 11:44:25 -0500
>> schrieb John King <jmking1 at gmail.com>:
>>
>>> I'm having problems with myth playback using the OpenGL renderer and
>>> the radeon Xorg driver.  Basically it looks like the mythtv video
>> This ticket maybe related (well, output isn't stuck anymore, but
>> doesn't work either): http://code.mythtv.org/trac/ticket/9216
>>
>> FWIW, I'm also running MythTV with an RS780 using xv-blit, which works
>> very well an reliable. Of course, working OpenGL would be a great
>> thing, if only to fix the OSD scaling. Maybe we can help Mark Kendall
>> finally solve out the issues, I should say the r600g should be running
>> well enough by now to support this.
> Coincidentally, I spent some time a couple of days ago on that ticket.
>
> I slotted my HD4550 into a couple of boxes to test AMD/ATI OpenGL
> issues. While I couldn't get the proprietary driver to install on
> either box, the radeon driver worked perfectly on both machines.
>
> One box is now quite old and the most up to date driver package I
> could get still had a couple of issues with OpenGL 2.0 support (which
> is not yet needed by default). On my master backend, using the very
> latest radeon version, everything I could test with it MythTV wise
> worked as expected. I then forced it to use the latest builds from the
> xorg-edgers ppa and enabled Gallium - and again, no obvious issues.
>
> So all told, while I was expecting a day of grief, I ended up being
> pleasantly surprised:)
>
> That said, there is still a significant performance issue with the
> OpenGL video renderer. While the MythtTV code uses a different
> approach to other players (and I would expect slightly higher CPU
> usage), there is a difference of 20-30% cpu utilisation across
> different platforms and using different GPU hardware. At this point I
> still don't know what is causing it, though I'm fairly sure the key
> factor is Qt; we rely quite heavily on the underlying Qt OpenGL
> support and somewhere it is causing a problem.
>
> regards
>
> Mark
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>
I can confirm that both openGL and xv-blit are broken
When using OpenGL, the size of the video tracks the size of the gui window, even when the settings say to do the video full
screen. (I prefer to have the gui use a smaller window and the video run full size). When the gui is full screen, the video is
full screen too, but it is dropping frames and causing the audio to hesitate when the video hesitates.
With xv-blit, the image size is good, and the sound is good, but the video drops frames when effects are enabled in Ubuntu, and
the image tears when effects are disabled.

The system is an i7 with 6GB Ram, and an ATI HD4850 video card driving a 2560x1600 monitor. I'm using the open source driver.
The display was working properly under ubuntu 10.10

I will be happy to provide any requested info if you can tell me how to get it from my system.

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