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Old 4th June 2009, 17:17   #1  |  Link
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DXVA not working with MS-VC1 decoder (Win 7, ATI)


MPC's H.264/VC1 DXVA Decoder works flawlessly for both codecs. So does MS's H.264 decoder. What doesn't work, however, is DXVA decoding with the MS WMV/VC1 decoder that is used by WMP and WMC.

When playing a VC1 file in DXVA Checker, no VC1 DXVA capabilities are reported for the MS codec (DShow or Media Foundation) - only for the MPC decoder.

My conf: Windows 7 RC, Radeon HD 3300 (AMD 790GX IGP) with Windows-supplied driver (8.612) [however, installing the Win7 driver from AMD's website doesn't help, I tried that]

Any ideas?

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Old 4th June 2009, 17:20   #2  |  Link
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You could try this VBS file first:

If that does not help follow the instructions in my signature and make sure to update to catalyst 9.5
Please let me know if this helps


Make sure you clean the old driver using driver sweeper Find at @ guru3d.com
MPC-HC, an open source project everyone can improve. Want to help? Test Nightly Builds, submit patches or bugs and chat on IRC

Last edited by tetsuo55; 4th June 2009 at 17:25.
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Old 8th June 2009, 13:01   #3  |  Link
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But is win7 WMP decoder supposed to work with DXVA for VC-1 files? I have the same as sphere when analyzing file by DXVAchecker. H.264 and MPEG-2 videos work great.
This filter decodes MPEG-1, MPEG-2, H.264 video
How is that video compression format (VC-1) promoted by Microsoft isn accelerated by its decoder while h.264 is?

Last edited by littleD; 8th June 2009 at 16:49.
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Old 8th June 2009, 19:03   #4  |  Link
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hum I have a similar problem with a nvidia card.
on windows 7 rc1 64 bits, a check of the directshow decoder (WMVideo Decoder DMO) with dxva checker shows only DXVA1 support :

I tried to force the use of DXVA in dxvachecker with EVR (right click - play - EVR), it doesn't work (black screen). But it works with VMR9 !

anyone can try dxvachecker on vista to see the result ? if it supports dxva2 on vista I hope they will fix that before the release of Windows 7.

EDIT : I am using MPC 32 bits so I am talking about the 32 bits version of the decoder, I didn't try the 64 bits one (I don't really care ^^).

EDIT2 : perhaps someone can split my reply in a new thread. It is obviously not the same problem.
this one (with ATI cards) has already been explained I think : WMVideo Decoder DMO only support ModeVC1_IDCT, ModeVC1_MoComp and ModeVC1_PostProc while ATI drivers only support ModeVC1_VLD

Last edited by MatMaul; 8th June 2009 at 19:12.
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dxva, vc-1, vc1, wmp

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