topic Re: MPEG-2 DXVA Not Decoding in Software Archive

MPEG-2 DXVA Not Decoding

gowthamhk — Fri, 21 Aug 2009 09:49:23 GMT

Hi

I am facing a problem in making my MPEG-2 Video Decoder filter to work using DXVA (essentially hardware decoding). My system supports MPEG-2 off-host bitstream processing. Here is my problem.

Following is the sequence of APIs I have called on XP, DXVA1.0 for MPEG2_A(probed and
locked for off-Host bitstream parsing):

- BeginFrame()
- GetBuffer( for PictureParameter buffer)
- Execute() (for PictureParameter buffer)
- ReleaseBuffer() (for PictureParameter buffer)
- Loop 3 times - (for InvQuantization, SliceControl and Bitstream data buffers sent together)
{ GetBuffer()
}
- Execute()
- Loop 3 times - (for InvQuantization, SliceControl and Bitstream data buffers sent together)
{ ReleaseBuffer()
}
- EndFrame()
- QueryRenderStatus()

All these APIs returned S_OK. but when I call DisplayFrame() with the same surfaceIndex, output is blank.

Experiments carried out :
1. - Called BeginFrame()
- Got the pointer to buffer through GetBuffer() with TypeIndex as 0xFFFFFFFF and
BufferIndex as surfaceIndex after BeginFrame and memset with a known value. (set with value 128)
- Called Execute() with necessary buffers
- Called EndFrame()
- Called QueryRenderStatus()
- Again got the pointer to buffer through GetBuffer() and checked the values, It was not modified
and the value was exactly equal to what i set previously. (it was still 128)

This means even if all the APIs return S_OK, the surfaceIndex is untouched. I am stuck at this point.

2. I also carried out one more experiment by sending InvQMatrix, SliceControl and bitstream data
buffers through separate Execute calls. We Initialized *lpPrivateOutput to 128.
Here lpPrivateOutput of Execute() returned '0' while sending InvQmatrix and slicecontrol buffers.
But when bitstream data buffer(bitstream starting from slice start code of 1st slice) was sent
lpPrivateOutput was not updated. Does this mean that there is some problem in sending the bitstream buffer?

Please help me if I am missing something. If any addition information is required please let me know.
Any Input or thoughts is greatly appreciated.

Thanks,

Cheers,
Gowtham

Re: MPEG-2 DXVA Not Decoding

gowthamhk — Thu, 29 Oct 2009 06:22:51 GMT

Quoting - gowthamhk

No response from Intel???

Re: MPEG-2 DXVA Not Decoding

gowthamhk — Fri, 30 Oct 2009 05:09:09 GMT

I got it, anyways.

Re: MPEG-2 DXVA Not Decoding

htq — Fri, 05 Mar 2010 19:16:05 GMT

Hello gowthamhk,

I'm facing a similar problem using DXVA2 in VLD MPEG2 decoding mode (the output surface is blank/green).

Could you please explain how did you manage to fix the blank output problem?

Thank you in advance!

Re: MPEG-2 DXVA Not Decoding

gowthamhk — Mon, 08 Mar 2010 05:18:32 GMT

Add 32 for MB bit offset in SliceInfo buffer. The doc doesn't mentions it properly. And let me know.

Re: MPEG-2 DXVA Not Decoding

htq — Mon, 08 Mar 2010 08:49:59 GMT

Thanks a lot!

Got it working. MS should correct the doc after so many years... It seems that adding 8 for the MB bit offset and removing the slice start code prefix also works.

Thanks again and best regards.

Re: MPEG-2 DXVA Not Decoding

gowthamhk — Mon, 08 Mar 2010 09:20:24 GMT

Yeah. That doc is a little ambiguous at places.

hello Gowtham, have you

jacky_yue — Fri, 28 Sep 2012 05:03:20 GMT

hello Gowtham, have you solved the problem? I have got the similar problem. thanks jacky

Hi all

shin — Tue, 09 Oct 2012 02:39:59 GMT

Hi all i have the similiar problem too, anyone can help ?