Microsoft DirectX Video Acceleration (DirectX VA) support (1 Viewer)

Gamester17

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I know Frodo already said that you can enable DxVA and HWMC in the register but this is a request for a more complete support for it;

Microsoft DirectX Video Acceleration (DirectX VA), both for hardware acceleration (motion compensation) and post-processing,
(simple options should be added in MediaPortal GUI settings and/or auto-detect if the video cards supported it and to what extent ):

Hope MediaPortal developer(s) can look into if this could be fully used within MediaPortal for all supported codecs and hardware?

Summery: Microsoft DirectX Video Acceleration (DXVA) allows DirectShow based software applications to accelerate video playback directly on the graphics processors (GPU). If your graphics processor supports DXVA and has built-in technology to accelerate DVD and MPEG-2 file playback, then DXVA can provide (GPU) hardware acceleration. DVXA is an application programming interface (API) and a corresponding motion compensation device driver interface (DDI) for acceleration of digital video decoding. DDIs are also provided as part of DXVA; a deinterlacing DDI for deinterlacing and frame-rate conversion of video content, and a to support ProcAmp DDI control and postprocessing of video content.

A good exampel of the benifits of using DVXA for video acceleration is that you can decode HDTV (ATSC/DTV) MPEG-2 with a PIII 733Mhz CPU, a task that would normaly require a PIII 1400Mhz CPU if the card does not support DVXA HWMC.

Other post-processing featutes achivable via DVXA (if the video adapter hardware support it):
- Hardware iDCT motion compensation and subpicture decoding
- Hardware based IDCT (Inverse Discrete Cosine Transform)
- IQ (Inverse quantization)
- Fullframe video playback of HDTV and DVD content on slow CPU's (733Mhz +)
- Independent hardware color controls for video overlay
- Hardware colorspace conversion (YUV 4:2:2 and 4:2:0)
- 5tap horizontal by 3tap vertical filtering
- 8:1 up/down scaling
- Perpixel color keying
- Multiple video windows supported for CSC and filtering
- DVD subpicture alphablended compositing
- Alpha-Blending Surface

Developer links:
- Enabling DirectX Video Acceleration in a custom player
- Windows Media Format 9.5 SDK Enabling DirectX Video Acceleration
- DVXA API/DDI Specification (Rev 1.0) (DirectX 8.1 C++ Archive)
- DirectX Video Acceleration Video Subtypes (DirectX 9.0 C++ Archive)
- IAMVideoAccelerator Operational Specification (DirectX 9.0 C++ Archive)
- Microsoft Developer information on DirectX Video Acceleration
- DirectShow DirectX Video Acceleration Video Subtypes
- Microsoft Development Network search result on DVXA
- DirectX Video Acceleration Motion Compensation Callbacks
- Calling the Deinterlace DDI from a User-Mode Component
- Per-Pixel Alpha Blending (DirectX 9.0 C++ Archive)
....AND MUCH MORE available on a Microsoft Development Network search

Exampel of above DXVA technology in use is the newly announced "nVIDIA DVD Decoder", (as almost GForce/nForce GPU's support it).
nVIDIA DirectX Video Acceleration (DXVA) support MPEG-2 acceleration for:
Inverse quantization (IQ),
Inverse discrete cosine transform (IDCT)
Motion compensation (mo comp)
Enables advanced de-interlacing
Decodes high-definition MPEG-2
http://www.nvidia.com/object/dvd_decoder.html
http://www.nvidia.com/object/decoder_faq.html

PS! nVIDIA's part in the GPU that support this is called HDVP (High Defininition Video Processor) / VPE (Video Processing Engine)
 
A

Anonymous

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dxva is a codec feature, not so much a player feature. You should bug the ffdshow guys to work on a dxva implement of their generic routines, or the xvid guys (which would then allow ffdshow xvid routines to use it).

I remember back in the day when my ati aiw rage pro could playback dvd resolution mpeg2 files on a p100, simply because the rage pro did hardware motion compensation, while everyone else was complaining about how badly dvd's looked on their 300mhz systems. DXVA would be a huge step in the right direction, especially for a system that multitasks such as an htpc where it might be recording a tv stream while decoding a different one. I know most of the htpc users are using hardware mpeg2 cards, but if you haven't noticed even transferring to ide takes a good chunk of cpu. Even offloading just the post processing would result in huge speed ups.
But I digress, this is something you need to take up with the codec makers.
 

Gamester17

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@Meat_PoPsiclez, no offence to you but I think I rather get a reply/answer from Frodo now that he's back :wink:
I don't agree with "DXVA is a codec feature" as I know it's so much more than that, at least it can be for MP 8)

PS! OFF-TOPIC; Any plans of integrating a version/derivitive of FFdshow into MediaPortal (with DXVA) :roll:
 

Frodo

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    I did some reading on DXVA, and as far as i understand it now this is the case:
    -DXVA is implement in a codec (like nvidia's DVD codec)
    -For normal playback the application doesnt need todo anything
    The codec will negotiate with the video renderer if DXVA is supported by your system and ifso will it use it
    -For streaming content DXVA is not used by default and the application has to add it manually

    Again, these are my first conclusions. This is a huge topic and I still got lot to learn & read before i can say that the above statements are true.
    Anyway, don't worry MP will have DXVA support. Either automagiclly or manually added by us. (Offcourse provided that you have a DVXA codec and your system is capable of using DXVA)

    Frodo
     

    Gamester17

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    frodo said:
    don't worry MP will have DXVA support. Either automagiclly or manually added by us
    Cool, thanks for looking into this Mr. Baggins (hihi), I'm sure you will realize its potential soon :D

    frodo said:
    provided that you have a DVXA codec and your system is capable of using DXVA
    ...back to off-topic; any chance if implementing FFdshow into the MP installation package? :wink:
    (maybe start a own derivative branch version that is designed and optimized for Media Portal)
     

    Frodo

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    Mario64 found out that you can set some registry keys to enable DxVA for the intervideo codecs. MP has been modified to set those keys automaticly for you

    Frodo
     

    Frodo

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    adding ffdshow, xmltv, vobsub etc etc
    will make the setup much larger which is not very nice for users
    who have a small internet bandwith connection
    We are currently looking into a way to auto-download the (latest)
    versions of these apps from the install/configuration
    So on 1st run it will ask the user whether or not to download it
    and if the user agrees it will be downloaded & installed
    frodo
     

    gds

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    ok, this maybe off-topic, but I can't help being amazed time and time again by the effort and the quality you put into this project. :D
    keep up the good work and, really, really, thank you.
     

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