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Topic: why is the "digital transition period" being handled so badly?
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Bobby Henderson
"Ask me about Trajan."

Posts: 10973
From: Lawton, OK, USA
Registered: Apr 2001
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posted 10-26-2011 09:39 AM
Blu-ray isn't a good alternative to DCP files on hard discs.
The data capacity of Blu-ray is very limited compared to that of hard discs. Only 25GB for a single layer BD-R disc and 50GB for a dual layer discs. Chances are certain only single layer discs would be burned. Then there's the issue of bandwidth. BD tops out at 50 million bits per second. Hard discs will probably always be much faster than any optical disc, both in terms of file access times and bandwidth rates (sustained, burst rate, etc.). Hard discs are reusable. BD-R discs are not; they'll be shredded and go into the land fill.
I really like watching movies on Blu-ray disc at home, but the AVC and VC1 encoded video on those discs are (usually) inferior to anything made to DCI standards. The video bit rate is typically much lower than that of a DCP, with all sorts of compression tricks thrown in that violate DCI rules. The color depth isn't as great even though Blu-ray does have, on paper, the capability of showing 10-bit or 12-bit per channel color.
The movie distribution people simply have to get their shit together. If anything, they ought to be pushing for higher standards now that things like USB 3.0 is very common. How about some 4K DCPs with considerably higher bit rates?
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