PAGE 1: The Beginning of PureVideo HD
PAGE 2: PureVideo HD Gen2 still not perfect
PAGE 3: G98ï¼PureVideo HD Gen 3
PAGE 4: Comparing the die
PAGE 5: Frequency of G98
PAGE 6: Test bed and remarks
PAGE 7: VC-1: 1080P, King Kong
PAGE 8: VC-1 1080P De javu
PAGE 9: H.264 1080P X-MAN3
PAGE 10: H.264 1080P The Prestige
PAGE 11: MPEG-2 1080P Pioneer DEMO2006
PAGE 12: HD video data summary
PAGE 13: 3DMark06
PAGE 14: Final thoughts
The Beginning of PureVideo HD
Dec 2004, NVIDIA officially announced PureVideo. It is a technology based on the integrated programmable video processing engine in GeForce 6/7. With this technology GeForce can decode high definition video using GPU.
In June 2006, NVIDIA upgrade PureVideo to PureVideo HD. It has all functions that PureVideo does, and has optimized for Blu-ray & HD DVD videos. PureVideo HD combines HD video decode hardware acceleration, post-processing and HDCP, providing good quality video playback.
The PureVideo HD Gen 1 only can let GPU handle Motion Compensation and Deblocking in H.264/VC-1 decoding. Bitstream Processing, Entropy Decode and Inverse Transform still left to CPU so it can only lower few CPU usage.
We know in among H.264, VC-1 and MPEG-2 this the three coding methods the H.264 is the most complicated one, its Entropy Coding is one of the most CPU intensive processing. In the chart below this paragraph, you will see how high it is takes. If playing video with a very high byte rate only using software decoding then today’s mainstream CPU can barely handle that.
In other words, PureVideo HD Gen 1 surely can accelerate decoding HD video but can not handle the most CPU intensive process: Entropy Decode and Inverse Transform. This two process leave to CPU and will raised its usage a lot. Some entry level computers even some mainstream computer can hardly play H.264 video smoothly.