Deinterlace Options ATI hardware vs Nvidia Software??

[m0ng00se30]

Ok.. this has been bugging me a while but I've been unable to find an answer, and wanted to know if anyone could explain this to me.

Nvidia Decoders deinterlace the mpegs when they are played. *easy enough*

ATI video cards have options to choose different types of deinterlacing (this showed up in some of the v5 Cats I think!)

My confusion is this... If I set the ATI to no deinterlacing it appears that the nvidia software decoder is NOT doing any deinterlacing. The image is horribly interlaced. Lots of stair stepping on any movement in the imgage.

So it seems (to me) that the ATI is doing the majority if not all of the deinterlacing. SO how can I make nvidia do the deinterlacing... I can watch the NVidia properties and it shows the correct type of video content being detected.

Seems to me... its either deinterlacing an already deinterlaced image or NOT doing anything at all???

Can someone shed some light or tell me what you do for this?

--Mike

[stanger89]

You know, I thought nVidias "Purevideo" was confusing, until I saw this stuff from ATI, man, I'm not sure anybody knows what's going on

From what I gather, you'll want to set the nVidia decoders to Automatic, and then ATI's settings to Automatic or Adaptive.

nVidia's decoders, in DXVA mode, rely on the video card to do the deinterlacing. The confusing bit is that on nVidia cards (and apparently previously on ATI cards) the decoder would control what the card did for deinterlacing, now it seems that the ATI Control Panel controls it, but the decoders may have an effect as well.

FWIW, you can't get "nVidia deinterlacing" on an ATI card as it's a function of the hardware.

[m0ng00se30]

Originally Posted by stanger89

FWIW, you can't get "nVidia deinterlacing" on an ATI card as it's a function of the hardware.

Ahhh guess this is the part I had confused then. I thought it did some software stuff anyway. Wow its really confusing then... if the card is doing all the deinterlacing why do different decoders look so different from each other when its really the VC doing the work.

Oh well... they just need a hardware encrypted dvd decoder in the video card. I have a 1800XL that I'm dying to try out, but can't bring myself to tear into sage right now!

Thanks as always Stanger

--Mike

[stanger89]

Originally Posted by m0ng00se30

Ahhh guess this is the part I had confused then. I thought it did some software stuff anyway. Wow its really confusing then... if the card is doing all the deinterlacing why do different decoders look so different from each other when its really the VC doing the work.

Because it's hardware accelleration some of the decoding is done in software, and the rest is passed off to the VC. If you have DXVA enabled, then the deinterlacing is one of those things passed off to the video card.

In the case of an nVidia VC with nVidia decoders, it appears that there may be some communication between the two, to allow the hardware film detection.