[opendtv] Re: Format Independence

  • From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Wed, 09 Nov 2005 23:46:08 -0500

Yes.  Blank areas are essentially null.  So are repeated frames.

TTFN,
Mark


dan.grimes@xxxxxxxx wrote:

>So when you say a good entropy encoder doesn't waste bits, you are saying
>that the extra frames or black sides really don't take many bits?  This
>would be B frames basicly being nul?  and the black areas to each side
>being virtually nul?
>
>Dan
>
>
>
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>                      Mark Schubin                                             
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>                      <tvmark@earthlink        To:       opendtv@xxxxxxxxxxxxx 
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>                      Sent by:                 Subject:  [opendtv] Re: Format 
> Independence                             
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>                      11/09/2005 06:35                                         
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>The problem is on the consumer end.  Some early receiver/decoders froze
>when there were format changes.  Rest assured that a good entropy coder
>doesn't waste bits on what isn't really there.
>
>TTFN,
>Mark
>
>
>dan.grimes@xxxxxxxx wrote:
>
>  
>
>>In response to some of the discussion about formats, I have another
>>question.  Why do broadcasters put out a fixed format stream when at the
>>production level the format is different.  For instance, if Fox puts out
>>720@60P all the time, and the original production content is 24P, why
>>    
>>
>would
>  
>
>>the broadcaster waste bits by sending several frames of the same picture?
>>Why not send out 720@24P and use the 19Mb/s to send a less compressed
>>picture?  Or how about when a 640x480@30i is sent out 720@60P?  Is it a
>>problem with the master control switcher only switching one format, or the
>>server, or is the problem on the customer's end (like the monitor won't
>>naturally switch)?  Is it simply easier that way?  I would think a lot of
>>efficiency could be gained there.
>>
>>Dan
>>
>>
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