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Old 21st October 2010, 01:35   #1  |  Link
chapas
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DXVA and AMD 785G chipset problems

Hello people.

My HTPC is having problems with its DXVA decoding of 1080p h264 content.

I have proper DXVA decoding randomly. Sometimes the machine starts fine, but when I reboot for some reason I can't play any 1080p h264 file, not even with software! For some strange reason MPC-HC shows DXVA enabled but the videos stutter heavily. All videos present this problem. And then I reboot again and suddenly everything works fine.

Config is:
Biostar TA785GE 128M 6.0 (ATI HD4200 integrated, with 640MB memory, sideport + system)
AMD Athlon X2 240
4GB DDR2

Hopefully someone has a similar system and knows how to fix this.

Thank you!
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Old 21st October 2010, 03:52   #2  |  Link
Sharktooth
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have you tried updating the chipset/video drivers?
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Old 21st October 2010, 03:57   #3  |  Link
chapas
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Yes. I'm on the latest version on both, Southbridge (10.9) and Video (10.9a).

I can't get what's changing, since I just have to reboot to fix it, but it's not a real fix.
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Old 21st October 2010, 05:33   #4  |  Link
ranpha
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Disable the sideport RAM and use system memory exclusively.
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Old 21st October 2010, 17:04   #5  |  Link
chapas
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Hi ranpha. I just tried disabling sideport RAM.

I had proper DXVA for the first 2 boots. The third was broken again

Thanks anyway! I'm open to try any other fix.
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Old 21st October 2010, 23:34   #6  |  Link
chapas
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Ok, I got more info for troubleshooting. I captured the screen showing the information by MPC-HC's Display Stats:




In this screenshot playback is fine, but I noticed that when DXVA is somehow broken, the upper right "Clock" gets as low as 30%.

Is this useful?

EDIT: MPC-HC build is: mpc-homecinema.1.4.2689_(x86)_msvc2010

Last edited by chapas; 21st October 2010 at 23:36. Reason: Added MPC-HC build
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Old 23rd October 2010, 06:16   #7  |  Link
yetanotherid
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Maybe instead of using MPC-HC, try ffdshow for DXVA playback.

Try installing the latest version of the Combined Community Codec Pack (it's basically MPC-HC & ffdshow), let it disable anything it wants to disable as it installs and select the DXVA option at the settings screen during installation.

If that works try enabling DXVA in MPC-HC again, if you want to, to see if the problem returns.
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