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ATI Radeon 9200SE onboard MPEG2 decoder and XvMC
http://forum.linhes.org/viewtopic.php?f=2&t=3417		 Page 1 of 1
Author:  dullard [ Wed Feb 02, 2005 1:59 am ]
Post subject:  ATI Radeon 9200SE onboard MPEG2 decoder and XvMC
I (finally) have a working R4V5 instalation and I'm very happy indeed! I have one small problem and one question:

The problem - I notice when I am watching a program (recorded or live) that a little flash occurs once in a while. It seems to be a frame shifted to the left by about half the screen. I thought using the hardware decoder on the ATI card might fix this, and that leads me to my question: Is the decoder on this card supported (perhaps through XvMC)? The WIKI kind of says yes: http://knoppmythwiki.homelinux.org/index.php?page=HollywoodPlus
Quote:
...it would benefit the end-user more to look into the XvMC functions on the NVidia GF4+ or newer ATI cards. XvMC does the same MPEG2 decoding as these cards, and has support in MythTV as well as Xine and Mplayer.

But Xsecrets definately says no: http://mysettopbox.tv/phpBB2/viewtopic.php?t=605i
Quote:
ati cards ARE NOT supported by xvmc so turn it off. It doesn't do you any good unless you are recording with a hardware card anyways. RTJPEG is not MPEG2 and will not be accelerated.


Furthermore, I can't get XvMC to work, but that's hardly a surprise.

P.S. Did I post this in the right place?

Thanks
-----------------------
3GHz P4 w/ 512MB RAM
FIC 865 Dynasty (Intel 865PE chipset)
ATI Radeon 9200SE
Hauppauge PVR 250
Crappy old TV
Author:  Xsecrets [ Wed Feb 02, 2005 8:37 am ]
Post subject: 
well seems like somewhere along the way I heard of an xvmc driver that worked for an ati card, but even if there was one out there the xvmc support in knoppmyth is compiled with the nvidia xvmc driver, so it would not work. Besides, the only problem I've ever known xvmc to fix is high cpu usage. other than that it just causes problems, and lots of them.
Author:  Liv2Cod [ Wed Feb 02, 2005 11:12 am ]
Post subject: 
Like Xsecrets says, XvMC is pretty broken under Myth. I've heard that mplayer can use it successfully, but playing with XvMC in Myth causes many problems -- lockups of the frontend whenever you skip forward or backward, lockups when the onscreen display fades out, "shudders" in time where the video rapidly jumps around, etc.

I had an exchange with Isaac Richards on the myth-user list where he implied these problems are fixed in CVS, but I have not heard of anyone having success even with that version. And Isaac never came out and said "I'm using it and it works." He did say, "I'm tired of people saying XvMC doesn't work when they haven't tried it under CVS," which fits me so I dropped it.

For now. :wink:
Author:  Xsecrets [ Wed Feb 02, 2005 12:37 pm ]
Post subject: 
one thing to note I have used xvmc under even the release version successfully for standard def video, however the problem comes in when using it for hdtv on my system. My guess is it's a cpu load thing, and xvmc is broken whenever you have a fairly high cpu load even when using it.
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