PureVideo HD

PureVideo HD

Incorporated into the the GeForce GTX 200 series is obviously the newer VP2 video decoder core logic. So here's our standard snippet on that.

PureVideo HD is a video engine built into the GPU of your graphics card (dedicated core logic). It allows for dedicated GPU-based video processing to accelerate, decode and enhance image quality of low- and high definition video in the following formats: H.264, VC-1, WMV/WMV-HD, and MPEG-2 (HD). Speaking more generic; your graphics card can be used to decode SD/HD materials in two categories:

HD Acceleration
The more your graphics card can decode the better, as it'll lower the overall used CPU cycles of your PC. VC1 is without a doubt the most used format, and secondly, the hefty, but oh so sweet H.264 format. We'll fire off a couple of movies and allow the graphics cards to decode the content; meanwhile like a vicious minx we'll be monitoring and recording the CPU load of the test PC.
HD Quality
Not only can the graphics card help offload the CPU, it can also improve (enhance) image quality; as it should. So besides checking out performance of AMD's Avivo HD and NVIDIA's PureVideo HD video engines, we want to see how they affect the image quality, e.g. post-process and enhance the image quality of the video.

Basically, in the entire GeForce Series 8 and above we see a 10-Bit display processing pipeline and also new post-processing options like:

• VC-1 & H.264 HD Spatial-Temporal De-Interlacing
• VC-1 & H.264 HD Inverse Telecine
• HD Noise Reduction
• HD Edge Enhancement
• HD Dynamic Contrast Enhancement
• HD Dynamic Color Enhancement

These recently added features will be available for all GeForce series 8, 9 and GTX 200 series products. So please understand that with a GeForce 9600 GT comes the exact same VP2 decoding engine as found on the GTX 260/280/295. You'll have your low-CPU post-processed, decoding 1080P image quality options with HD-DVD and Blu-Ray.

Now read the topic carefully as with this new release we mainly talk about enhancements. In the more recent drivers you'll notice the addition of two new features: Dynamic Contrast and Color Enhancement.

It does pretty much what the name says; Dynamic Contrast Enhancement technology will improve the contrast ratios in videos in real-time on the fly. It's a bit of a trivial thing to do, as there are certain situations where you do not want your contrast increased. Think for example a scary thriller, dark environment... and all of the sudden your trees light up. So with that in mind; the implementation has been done very delicately. It does work pretty well, but personally I'd rather tweak the contrast ratio myself and leave it at that.

The second feature is Dynamic Color Enhancement. It's pretty much a color tone enhancement feature and will slightly enforce a color correction where it's needed. We'll show you that in a bit as I quite like this feature; it makes certain aspects of a movie a little more vivid.

Also a small new addition for Vista Aero enthusiasts, previously when you play back a movie while utilizing graphics processor with software like PowerDVD, and thus had to shut down Vista Aero and revert back to the basic Vista theme; this has now been solved and windows transparency, thumbnail previews etc are all working as it's intended to do.

Also new is a feature called Dual-Stream decode. Pretty much it boils down to the fact that you can display two video streams simultaneously. Pretty handy if you watch a Blu-Ray movie with a small directors commentary window on the lower part of your screen.

Let's split the frames in two and compare with all interesting tweaks enabled. Two older features, edge enhancement and noise reduction obviously are also at your disposal. To the left the baseline (first) image, to the right the final result. Once we enable these as well and combine them with the Dynamic Contrast Enhancement and Color Enhancement options we see a distinct difference in image quality.

Thanks to edge enhancement the frame is more sharp. That's PureVideo at work.

An urban myth: I get this asked a lot, can the GPU decode x.264 files? No it cannot. Media Player Classic allows it partly, yet under very stringent encoding requirements. I know, it's a darn shame.