high definition tv HDTV

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#41
The datarate for raw 1080p50 is just silly! But in reality its all rather academic as its put through the MPEG grinder and then stuffed down as little bandwidth as they can get away with to maximise profit by cramming in more channels.
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Indeed, the eye-watering 3Gbps required for raw 1080/50p acquisition is posing a major technical headache for the industry.

However, the MPEG4/H.264 AVC does produce impressive results at fairly modest bitrates - 40Mbps (BlueRay) 30Mbps (HD-DVD) and around 15Mbps for DVB.

I've viewed many of the HD trailers available on the Apple website. They are encoded at around 10Mbps. Viewed on a 46 inch 1080 Sony LCD at 23.98P, the results are astonishing. All with 5.1 surround thrown in!

Of course the content of these trailers is generally very flattering to the system - the true test for broadcast HD is live sports coverage were fast action coupled with dynamic camera coverage often shows up the weaknesses of the data compression at lower data rates.

Regards,
Ian
 
#42
Hi Mark,

Where I work we have two 4K Sony projectors. I've been working as a video engineer for nearly 15 years developing video compression systems based on Wavelets (similar to JPEG2000), and ultra high resolution cameras for government and commercial applications. Our ultra high resolution cameras have a standard 2K HDSDI view finder output, and two pseudo HDSDI outputs for 4K at 30p bayer pattern. We then use an external display box that interpolates the bayer pattern's two greens, red, and blue to full resolution 3840 x 2160. It's then interleaved and divided into four 1080i HDSDI quadrants as required by the Sony projector. The image as you can imagine is stunning. I guess with DCI nearly complete we may see 4K in theaters in the near future. I know the movie industry is betting big time that digital cinema will get people back in theaters. After seeing what 4K looks like, i agree.

Just wanted to add my two cents. I've been following the audio forums for more than two years now. It's refreshing to discuss some video.

Best regards,

Al
 
#45
I know the movie industry is betting big time that digital cinema will get people back in theaters. After seeing what 4K looks like, i agree.
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Hi Al,

The majority of the systems deployed in Cinemas will be 2K DLP based systems built by Barco, Christie and NEC. The Sony still is operating in a brightness realm that is to low for very large cinema screens which is what it is intended for... only 15K lumens maximum while the NEC 2K DLP based propjector will do 28,000 continous all day long if needed, its even been put into one Drive Inn so far! Sony has had MAJOR problem getting their 4K projector running consistantly in the field and it has yet to even run at 4K resolution in a cinema! The SXRD chips are VERY heat sensitive and is the main reason JVC pulled out of the D-Cinema market completely...ditto for the Kodak 3K projector which was demoed at Showest about 3 years ago. I was just at Showeast in Orlando and they blew big time a sneak showing of "Happy Feet". Sony's reputation in the cinema industry is already really bad with the poor performance and very early demise of the SDDS digital sound system. Then there are the laptop batteries and all the problems with playstation 2. Sony is really not having a good year this time around..... Plus even on a good day they are an awful company to deal with... very dealer unfriendly!

Mark
 
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