DXVA and AMD 785G chipset problems

chapas · 21st October 2010, 01:35

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!

Sharktooth · 21st October 2010, 03:52

have you tried updating the chipset/video drivers?

chapas · 21st October 2010, 03:57

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.

ranpha · 21st October 2010, 05:33

Disable the sideport RAM and use system memory exclusively.

chapas · 21st October 2010, 17:04

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.

chapas · 21st October 2010, 23:34

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

yetanotherid · 23rd October 2010, 06:16

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.

21st October 2010, 01:35	#1 \| Link
chapas Registered User Join Date: Jul 2006 Posts: 52	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!

21st October 2010, 03:52	#2 \| Link
Sharktooth Mr. Sandman Join Date: Sep 2003 Location: Haddonfield, IL Posts: 11,768	have you tried updating the chipset/video drivers? __________________ MPEG-4 ASP Custom Matrices: EQM V1(old), EQM AutoGK Sharpmatrix (aka EQM V2), EQM V3HR (updated 01/10/2004), EQM V3LR, EQM V3ULR (updated 04/02/2005), EQM V3UHR (updated 17/12/2004) and EQM V3EHR (updated 05/10/2004) Info about my ASP matrices. MPEG-4 AVC Custom Matrices: EQM AVC-HR Info about my AVC matrices My x264 builds. Mooo!!!

21st October 2010, 23:34	#6 \| Link
chapas Registered User Join Date: Jul 2006 Posts: 52	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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21st October 2010, 03:57	#3 \| Link
chapas Registered User Join Date: Jul 2006 Posts: 52	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.

21st October 2010, 05:33	#4 \| Link
ranpha Registered User Join Date: Feb 2008 Posts: 335	Disable the sideport RAM and use system memory exclusively.

21st October 2010, 17:04	#5 \| Link
chapas Registered User Join Date: Jul 2006 Posts: 52	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.

23rd October 2010, 06:16	#7 \| Link
yetanotherid Banned Join Date: Apr 2008 Posts: 723	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.