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Satellite transponder channel bandwidths used to be in the 20-24 MHz range, and as I said my numbers looked to be for a higher-fi image than they talked about.
Certainly the fiber would win, yup, yup.
Larry
-----Original Message-----
From: Rogers, Shawn [SMTP:s-rogers@xxxxxx]
Sent: Friday, November 17, 2000 8:42 AM
To: Miller, Larry [SC7:322:EXCH]; '802.3ae'
Subject: RE: First Film To Be Sent Via Satellite
So using your numbers the transfer rate comes to about ~52Mb/s (1.5Terabits/8hrs) - hardly earth shaking. I'll bet Williams communication got the movie there first.
Shawn
-----Original Message-----
From: Larry Miller [mailto:ldmiller@xxxxxxxxxxxxxxxxxx]
Sent: Friday, November 17, 2000 9:02 AM
To: Rogers, Shawn; '802.3ae'
Subject: RE: First Film To Be Sent Via Satellite
A) This looks like a heck of a good idea.
B) Guesstimate calculations:
(These are Big Screen estimates from my CineRama/Todd-AO days at Ampex many moons ago)
Film width 70 mm (maybe 140mm)
Frame Height: 35 mm
Resultion at Film Plane: 100 line pairs/mm (could be higher)
Frame rate: 30/sec
Film length: 120 min or 7200 sec or 216,000 frames
1 frame:
100 lp/mm * 2 * 100 lp/mm * 2 = 40,000 pixels/mm^2
Area: 70 mm x 35 mm = 1400 mm^2
Pixels/frame = 40,000 x 1400 = 56,000,000 (probably high; the working area of film is less, don't have the manual handy)
Bits/pixel = 40 to 64 (film has more dynamic range than TV or VGA!)
Bits/frame = 64 * 56,000,000 = 2.24 Gb/s
Data rate = 2.24 Gb/s * 30 frames/sec = 67.2 Gb/s.
This is totally uncompressed. Video compression ratios of 10:1 to 100:1 are not uncommon. In particular the RGB color channels are usually sampled at only 1/2 the brightness channel because of reduced color spatial resolution of human bein's.
At even 10:1 compression it would fit into an .ae channel with plenty left over for error checking/correction, blow-you-away sound. 1 wavelength in a DWDM fiber.
Mini-DV takes about 272 Mb/sec (but is only NTSC resolution) Does not do well in a 100BASE-TX channel :(; hence FireWire.
DVD (MPEG-2 compression) is 5-6 Mb/sec (turn on your DVD's Nerd-O-Meter), easily fits in a 10BASE-T channel. A DVD movie usually fits on a 9 Gb disk (1 side).
If we agree to 6.7 Gb/sec then a movie would require 1.45 Terabits. Or maybe as little as 150 Gb, which can be had for $1500, trivial compared to a release print cost.. You would need some bodacious buffering, though! And the "highly compressed" bit would be to fit into satellite transponder channels. I would think it would be easier just to ship hard disks.
From the numbers quoted below, it does not look like they are talking Cinerama-grade. 70mm release prints cost upwards of $10,000 in the late 1960's, for, say Mad, Mad, Mad, Mad World. And Philips 70 mm projectors (true mechanical works of art) cost a lot more than $35k. These babies could fill up a screen with 96ft chord length, used fluid cooling in the film projection gates, etc.
Your Mileage May Vary!
Fun speculations,
Larry Miller
-----Original Message-----
From: Rogers, Shawn [SMTP:s-rogers@xxxxxx]
Sent: Friday, November 17, 2000 5:46 AM
To: '802.3ae'
Subject: First Film To Be Sent Via Satellite
Anyone know how big a movie is (in GB's)? I'd like to figure the transfer rate.
Shawn Rogers
First Film To Be Sent Via Satellite
By GARY GENTILE
AP Business Writer
LOS ANGELES (AP) -- Movie-goers in New York's Times Square will get a glimpse of the future Friday when they see
Miramax's ``Bounce'' -- the first film to be beamed via satellite to a theater.
Hollywood has been experimenting with digital projection for several years. A handful of movies, from Warner Bros.' ``The Perfect Storm'' to Disney's ``Tarzan,''
have already been shown on special projectors that use computer discs rather than bulky and brittle film.
In those experiments, a movie is transferred from a master at a post-production house to a digital file, then compressed onto several discs. The discs are shipped to
theaters where the files are decompressed and stored on large computers.
This summer, Twentieth Century Fox sent a digital version of its animated ``Titan AE'' to a theater over a fiber optic cable.
But history was made earlier this week, when a digital copy of ``Bounce'' was converted to an electronic stream and bounced off a Boeing satellite using
military-strength encryption. The movie was also sent separately via a fiber optic cable. It was the first test of a system that may one day eliminate the scratches and
pops and stray hairs that routinely mar the movie going experience.
``You can't scratch a zero or a one,'' Phil Barlow, executive vice president of the Disney Motion Picture Group, said Thursday. Miramax is owned by The Walt
Disney Co [NYSE:DIG - news].
``Bounce'' is a love story between an advertising executive (Ben Affleck) and the widow (Gwyneth Paltrow) of a man to whom he gave his ticket on a doomed
airplane.
A master of the movie was transferred to a highly-compressed digital file using equipment made by QuVIS Inc. of Topeka, Kan.
The file was encrypted by Boeing, which then added a second layer of encryption to the electronic stream it sent via satellite. It took 8 hours to send the file from
Tulsa, Okla., to a satellite dish atop the theater in New York.
Once in the theater, a QuVIS computer decrypted and expanded the file and stored it on several computer hard disks. From there, it was projected using equipment
made by Texas Instruments.
Williams Communication of Tulsa, Okla., provided uplink services for the satellite and also relayed the movie via its broadband fiber optic network.
Movie studios are searching for a way to eliminate costly prints, which can range from $1,500 to $2,000 each for as many as 4,000 copies for a major release.
Studio executives feel that the better quality provided by digital copies will also generate more revenue by luring more people back to state-of-the-art theaters.
``The savings will not accrue to the studios for some time,'' Barlow said. ``The best way to make more money is having more people coming in to see the movies.''
Right now, the cost of digital projection equipment is steep -- anywhere from $150,000 to $200,000 per screen. That compares with about $35,000 for a
conventional projector.
Barlow estimates that digital projection won't become widely accepted until the costs come down under $75,000.
Theater owners are reluctant to shoulder the cost, especially when many chains are struggling with massive debt incurred to build new theaters. Studios and theater
chains are discussing a formula to apportion the capital costs, especially since the studios will reap the initial financial benefits.
``We understand that the burden needs to be shared in proportion to the benefit received,'' Barlow said.
For now, chains such as AMC Entertainment Inc., which owns the AMC Empire Theater in Times Square, are working with the studios and technology companies
to test new systems.
``We see our role at this point as being a proponent of digital technology because we see it as right for our business and our customers,'' Rick King, an AMC
spokesman said. ``We'll put the cost issues aside for now. If the returns are there for the investments, then money will be found to make the investment.''
___________________________________________
Shawn Rogers, PMP
s-rogers@xxxxxx
Serial Gigabit Products Dev. Mgr.
Texas Instruments/ 12500 TI Boulevard
M/S 8732/ Dallas, Texas 75243
Tel: 214-480-2678, Fax: 214 761-6954 Pager: 972-597-1803
___________________________________________