DxVA question

[footmasta]

Can someone tell what exactly this DxVA setting is? How do I know which one to use, does it affect live tv or just playback?
Thanks

[korben_dallas]

DXVA uses the 3d rendering engine on your graphics card to perform the video output. If you have a good DirectX 9 video card, then it's probably the way to go, unless you are getting lots of studdering or choppiness.

I use the Nvidia DVD/MPEG-2 codec, and so far as I can tell, it decides which DXVA to use on the fly, so I've just left the option in SageTV to default.

[stanger89]

Not to disagree, but DXVA doesn't (necessarily, not sure on newer cards) use the 3D engine, it stands for DirectX Video Accelleration, and is a separate API (AFIAK) for allowing the video card to do some of the video decoding.

As for what setting, IMO don't mess with the settings in Sage, they either don't do anything or can cause problems with some decoders/settings.

LiveTV is just playback.

[korben_dallas]

Stanger's the man who knows! I stand corrected.

Here's a techie definition:

What is DXVA?

DXVA (DirectX VA) is the new Microsoft standard API for accelerating video rendering under DirectShow. Some display adapters provide hardware that can accelerate MPEG2 video playback either through Motion Compensation or through advanced iDCT (inverse discrete cosine transforms) for better video playback performance. Prior to DXVA, each display adapter company had their own unique and proprietary interface for accessing these hardware capabilities to the decoder.

DXVA now eliminates the need for these proprietary interfaces. DXVA is the new API that connects the video decoder to the display driver and is only available under DirectShow. DVD players and video decoders that do not use DirectShow by default cannot take advantage of DXVA. DXVA debuted with DirectX version 8.0 and is required by WHQL (Windows Hardware Quality Labs) on Windows XP.