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Old 06-26-2007, 01:37 PM   #18  
drdumont
Long Journey into HD
 

Join Date: May 2007
Location: Dallas Area
Posts: 40
Default Compression

Quote:
Originally Posted by paulc View Post
Let's be careful here... FIOS, the cable guys, the satellite guys are the distribution mechanisms... but the source signal ALWAYS has "compression." The issue is that to achieve higher "number of channels" it has been known a distributor applies additional compression (the infamous "HDLite").

AND we have documented cases where one of those signal sources (PBS) would multi-cast so much crap in their bandwidth that PQ was HUGELY effected (the most god-awful motion blur... on talking heads!).
The point of my remarks has always been that unlike others, the FiOS system does not compress or alter the incoming signal. Obviously, they can't uncompress a signal any more than you can unscramble an egg. We are back to GIGO. In my experience, all the other delivery systems, CATV, Satellite, wet string, etc, alter the incoming signal to fit their "pipe". Indeed, there are OTA broadcasters who compress their incoming feed - witness a station in North Texas which is broadcasting two separate HD streams full time, over one OTA channel. C-W and FOX, I believe. Looks fair to crappy, but the average viewer at home won't know the difference.

You say "...(PBS) would multi-cast so much crap in their bandwidth.." - do you mean the local PBS broadcasting station? If so, OH, YES, BIG TIME! I don't believe their incoming streams look that bad, however, unless that particular station has severely limited incoming pipes. Most PBS stations get their main PBS feed from the PBS satellite distribution system, which is top drawer. There's a difference between the Network and the Local Station. PBS (The Network) is pretty cranky about their signal quality. What happens at the local broadcasting station's level can produce wayyy less quality than the Network's signal.

-- Doc
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