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1139 posts

Uber Geek

Trusted

  # 449244 17-Mar-2011 14:27
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hasso: Can't remember exactly, but wasn't there a limitation within certain versions of Windows or DirectX (?) that only permitted the monitor designated as primary to have hardware video acceleration? Don't know if this is the same situation as you are having, but sometime in the past  (Windows XP?) I distinctly remember that if I played video on the secondary monitor it would jerk and pan scenes were crap, but if played on the primary everything worked perfectly.

Bang on. DirectX only supports DxVA (hardware acceleration) on the primary monitor. Check the codec that you're using and try and use something like CoreAVC (for h.264) that is really CPU efficient and doesn't necessarily require video card acceleration.

gzt

10989 posts

Uber Geek


  # 449411 17-Mar-2011 22:44
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So does setting the TV as your primary monitor give you a smooth experience?

Also, what is your OS? This could be important.

And,

VLC 1.1.0 and GPU decoding on ATI (2010-07-02). The latest released version of VLC, 1.1.0, that was out a week ago, and has been downloaded half-a-dozen millions times so far, has added GPU acceleration for HD decoding under Linux and Windows. On Windows, as already stated, the code isn't working correctly with AMD Radeon cards.Therefore, we have been working with AMD on this topic and after common work, we are going to release a new version of VLC, versionned as 1.1.1, that will work with the upcoming ATI Catalyst 10.7 driver. AMD did provide us a beta of this driver and we have verified successfully that GPU acceleration works. Thanks for your understanding and your support.

- http://www.videolan.org/news.html

VLC GPU AC is disabled by default. Might be worth a go.

VLC -> Tools -> Preferences -> Input and Codec Settings -> Use GPU Acceleration (experimental).

mm135200: Bang on. DirectX only supports DxVA (hardware acceleration) on the primary monitor. Check the codec that you're using and try and use something like CoreAVC (for h.264) that is really CPU efficient and doesn't necessarily require video card acceleration.

Efficient codec sounds like a good idea. But, wasn't the DxVA/primary only resolved sometime after Windows 2K/DX8?

 
 
 
 


362 posts

Ultimate Geek


  # 449543 18-Mar-2011 11:59
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From memory, I thought that the ATI cards would only transmit an HD signal over HDMI if it was the primary display/only display output, or has this been fixed with newer driver revisions?

If not your GPU might be trying to scale, adding to its load?

Also, your TV - Plasma or LCD?




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103 posts

Master Geek


  # 455352 4-Apr-2011 23:05
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Yea I would check your cpu usage because the video sounds like its not being accelerated from the gpu any more. Is there any way you can tell if the video is using acceleration?

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