[opendtv] Re: Time to give up on 1080i for football

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 8 Dec 2009 12:35:30 -0500


I'm sorry, then I missed your point regarding ATSC and VBR.  VBR of a single 
stream is useful on a storage medium because the total capacity of the storage 
medium is fixed, and VBR can be used to maximize the program length held within 
that fixed capacity.

VBR on a single transmission stream, where the limiting factor is the 
transmission rate, would only result in increased null packets to stuff the 
transport stream.

Therefore it would be pointless to apply VBR  to a single ATSC program.  
However, VBR does exist in multiplexed ATSC streams, as we both apparently 


  ----- Original Message ----- 
  From: Mike Tsinberg 

  Sure. The  end result of four multiplexed VBR streams into one creates one 
CBR stream. Yes that is one case of VBR for broadcasting. What I meant is 
transmission of a single HDTV stream that occupies complete channel for maximum 
picture quality.

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