VUDU readying Blu-ray quality rentals

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squiggleslash @ Sep 10th 2008 10:18AM

> but is 13.5 GB blu-ray quality?

Almost certainly. While some people like to quote the maximum bit-rates for Blu-ray media, in practice the maximum bit rate is only used for scenes with a massive amount of movement including new objects or objects off-screen. For example, a corn field filling up the screen with everything swaying back and forth, or, at the other end of the spectrum, the opening credits of the X-Men movies. And that maximum will never be Blu-ray's actual maximum, it'll be somewhere in the region of 30Mbps.

On average, you're looking at 10-15Mbps for a typical Blu-ray disc that uses VC-1 or H.264 compression. Some of that bandwidth is taken up with superfluous stuff that doesn't need streaming - for example, alternative soundtracks, PIP, etc.

Realistically, a Blu-ray quality movie, 1080p, two hours long, VC-1 or H.264 compression, should only take up around 10-15G. You can get an idea of what's possible by considering that a BD9 (8.5G) can store a little less than an hour and a half of Blu-ray spec movie content.

Your estimates are almost certainly right.

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squiggleslash @ Sep 10th 2008 10:18AM

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