[opendtv] Re: HD Data Rate on Cox, Las Vegas

  • From: Richard Hollandsworth <holl_ands@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Tue, 12 Feb 2008 14:18:45 -0800 (PST)

Cable systems send two (high bit rate) or three (bit starved)
MPEG2 HD channels per 38 Mbps QAM carrier.
With more efficient MPEG4 Encoders becoming available,
this could leap forward to seven or eight (bit starved) HD channels:
http://www.screenplaysmag.com/Editor/Article/tabid/96/articleType/ArticleView/articleId/442/Default.aspx
Of course, LOCAL broadcast stations would need to also output MPEG4.
So this will mostly impact non-LOCAL HD channels.

More HD channels per carrier (whether SAT to headend or QAM)
would also permit much more efficient STATMUX operations
with many more "static" channels available from which the highly
active channels can "steal" bits.  Channel Bonding helps in same way.

holl_ands

==================================
John Willkie <johnwillkie@xxxxxxxxxxxxx> wrote:        v\:* 
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{behavior:url(#default#VML);} .shape {behavior:url(#default#VML);}       
st1\:*{behavior:url(#default#ieooui) }           Interesting but not exactly 
complete. If the station is putting out 7 mbps because they?re just showing a 
news anchor in front of a desk, do the cable systems add video content to pad 
the stream out to 19.8 mb/second?
   
  We?ll just have to assume that a 17 mb/second basketball game in MPEG-2 
codecs, can go to 7 mb/second with MPEG-4 with no loss of a single visual bit.  
If not, it may not be HDTV.
   
  John Willkie
   
      
---------------------------------
  
  De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En 
nombre de dan.grimes@xxxxxxxx
 Enviado el: Tuesday, February 12, 2008 12:50 PM
 Para: opendtv@xxxxxxxxxxxxx
 Asunto: [opendtv] HD Data Rate on Cox, Las Vegas
  
   
  Craig wrote, "Cable is giving ESPN-HD about 12 Mbps, possibly more. perhaps 
someone with the right tools could verify this."
 
 According to John Fountain, VP of Technology for Cox Communications in Las 
Vegas, all HD signals on the cable system are MPEG-2 at 19.8 Mb/s but they are 
looking to MPEG-4 at 7 Mb/s in the future.
 
 Dan
  
  

       
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