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Old 10-02-09, 04:43 AM   #1
divisionmd
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Default vdpau + xinerama = when ?

Hello,

- when will support for vdpau be working in xinerma mode ?

- are there any plans/dates for this?

Thanks for help,

Best regards,
Johan
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Old 10-05-09, 12:43 PM   #2
Stephen Warren
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Default Re: vdpau + xinerama = when ?

There are no specific plans/estimates for Xinerama support at present.

In general, most setups can be supported by TwinView, which VDPAU does support. Can you switch to TwinView? If not, could you explain why, so that we can better understand your issue. Thanks.
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Old 10-06-09, 12:41 PM   #3
divisionmd
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Smile Re: vdpau + xinerama = when ?

Hello Stephen,

- Thanks for reply.

- I am building a media wall that has 8 screens.

- i am using xinerama for that - witch i thought was the only that will work?

- xinerma now works perfectly over these 8 screens - however would like to get hardware accleration from the GPU cards also - to boost the quality of the movies.

THanks for help,

best regards,
Johan
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Old 10-06-09, 12:52 PM   #4
Stephen Warren
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Default Re: vdpau + xinerama = when ?

You should be able to get this to work using Quadro GPUs and SLI Mosaic Mode.
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Old 10-07-09, 06:40 AM   #5
the Goat
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Default Re: vdpau + xinerama = when ?

Quote:
Originally Posted by Stephen Warren View Post
There are no specific plans/estimates for Xinerama support at present.

In general, most setups can be supported by TwinView, which VDPAU does support. Can you switch to TwinView? If not, could you explain why, so that we can better understand your issue. Thanks.
On my desktop I have two video cards (not configured as SLI but could be) driving three monitors with Xinerama. Any solution for me?
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Old 10-07-09, 01:32 PM   #6
Stephen Warren
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Default Re: vdpau + xinerama = when ?

the Goat, Sorry, I don't think so currently, besides not using Xinerama, but then the monitors will become different X screens.

(Unless these are Quadro GPUs in a configuration supported by SLI Mosaic Mode, but I imagine that's not the case).
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Old 10-07-09, 02:05 PM   #7
JaXXoN
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Default Re: vdpau + xinerama = when ?

Quote:
Originally Posted by Stephen Warren View Post
Quadro GPUs in a configuration supported by SLI Mosaic Mode
My understanding is that SLI Mosaic only works for Quadro Plex:
http://www.nvnews.net/vbulletin/show...2&postcount=26

QuadroPlex is just a bunch of Quadro cards in a separate housing connected
to the PC via a PCIe Bridge - so software-effort-wise there is no difference
between QuadroPlex and a bunch of QuadroCards put into a PC.
(So unless that somebody proves me wrong, I have to assume that the lack
of SLI Mosaic for Quadro cards is a marketing issue - probably even more true
concerning consumer GPUs).

So two Quadro cards in a PC won't do it!

Anyway, I can imagine that it is possible to render the VDPAU decoding
into a texture that can then easily be handled by Xinerama via GLX?
However, I don't have any practical experience with VDPAU, so far.

regards

Bernhard
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Old 10-07-09, 02:33 PM   #8
Stephen Warren
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Default Re: vdpau + xinerama = when ?

Sorry, I'm not too familiar with Quadro Plex etc. so forgot about this. Now that you mention that restriction, I believe you're correct. Sorry for any misinformation.
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Old 10-07-09, 02:38 PM   #9
divisionmd
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Default Re: vdpau + xinerama = when ?

Hello,

- ok so "SLI Mosaic Mode" with my two "NVIDIA Quadro NVS 420" will not work then.

- But back to original question will vdpau bee added/working with xinerama in the future?

- I have a video wall here with 8 screens and would like to use GPU accelartion.

Best regards,
Johan
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Old 10-07-09, 03:54 PM   #10
JaXXoN
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Default Re: vdpau + xinerama = when ?

Quote:
Originally Posted by divisionmd View Post
- ok so "SLI Mosaic Mode" with my two "NVIDIA Quadro NVS 420" will not work then.
The SLI Mosaic product page pretty clearly says "Feature available only on Quadro Plex"
http://www.nvidia.com/object/quadro_...saic_mode.html

Quote:
Originally Posted by divisionmd View Post
- But back to original question will vdpau bee added/working with xinerama in the future?
According to this one:
http://www.nvnews.net/vbulletin/showthread.php?t=123424
It should be possible to decode into a texture with some minor detour,
but I have no status on if this has been implemented for any of the
Linux video player applications.

Quote:
Originally Posted by divisionmd View Post
- I have a video wall here with 8 screens and would like to use GPU accelartion.
What is the native resolution of your video material?
Do you see any performance or quality issues compared to one screen?
Do you see any performance or quality issues on one screen
when comparing VDPAU and software decoding?

What I mean is: once upon a time, with mplayer it was possible to
(software-)decode into a texture, so that the GPUs would at least
do the scaling (through OpenGL). It's probably still possible to do
so today - I just didn't tried it out for years, so I can't guarantee it's still
working (and I currently do not have an nvidia GPU on hand to re-try).

In turn that means: you may first try to figure out what's the acutal
bootleneck: the decoding or the scaling.

regards

Bernhard
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Old 10-07-09, 04:45 PM   #11
crisalide
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Default Re: vdpau + xinerama = when ?

Quote:
Originally Posted by JaXXoN View Post
... It should be possible to decode into a texture with some minor detour, but I have no status on if this has been implemented for any of the Linux video player applications.
VDPAU cannot render into a texture. Instead, it can render into an offscreen X Pixmap which can then be used as a texture with texture_from_pixmap.
It's actually implemented in xbmc-linux and I also have it working with xine-vdpau (althought it's not yet commited). The main issue is that the only way to sync VDPAU rendering and texture_from_pixmap (iow, to know when the image is effectively rendered to the X Pixmap before drawing with GL) is to poll the output_surface status with VdpPresentationQueueQueryStatus, which can lead to some judder due to the way nvidia's vdpau actually behaves (which i think will change in the future).
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Old 10-07-09, 05:18 PM   #12
JaXXoN
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Default Re: vdpau + xinerama = when ?

Quote:
Originally Posted by crisalide View Post
VDPAU cannot render into a texture. Instead, it can render into an offscreen X Pixmap which can then be used as a texture with texture_from_pixmap.
Right, that's discussed in the thread linked above - that's why I wrote "detour" :-)

Quote:
Originally Posted by crisalide View Post
It's actually implemented in xbmc-linux and I also have it working with xine-vdpau
Sounds like good news for divisionmd! Maybe you can drop him a version so that he
can try how it works with his video wall? Would probably make up a good acid test ...

regards

Bernhard
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