Invisible nous apporta ses lumieres en ce 2007/11/22 07:55:
> scott wrote:
>>> Must take some serious MPEG compression to fit that onto a disk - 
>>> even a bluray disk has only finite storage capacity.
>>
>> 50 GB max IIRC.
> 
> Well, let me see...
> 
> 1,920 pixels x 1,080 pixels = 2,073,600 pixels / frame
> 
> 3 bytes / pixel x 2,073,600 pixels / frame = 6,220,800 bytes / frame
> 
> 25 frames / second x 6,220,800 bytes / frame = 155,520,000 bytes / second
> 
> Approx 148.31 MB / second. (Woah, that's some transfer rate!)
> 
> 8.69 GB / minute.
> 
> 512.40 GB / hour. So only 10x bigger than the disk. ;-)
> 
Now, each non-key frame only contains the difference from the preceding one. 
Normaly, every frame is compressed. The end result is that you have compression 
ratio well over 10, it can get in the 20 to 50 time.
They probably use MPEG2, it gives you about twice the compression of regular 
MPEG (MPEG1), with a slightly beter quality.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you think it's a failing of the 
universe that the large software companies like Corel or Fractal Design do NOT 
export to POV primitives.
George Erhard

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