[opendtv] Re: 1080i vrs 720P

On 29-Sep-05, at 1:13 PM, Craig Birkmaier wrote:

> This is the unfortunate reality of having an DTV standard
> that includes interlaced formats.

Funny how you wanted a DTV standard that offered many different  
emission signal configurations, but not one that offers many  
different image configurations.

> I do not have any way to determine the bit rates of the respective
> sources. I DO know - from conversations with the local technical
> staff -  that Cox cable is no longer doing interformat conversions
> and recompressing HD sources to deal with the limitations of the
> first generation SA boxes, which only supported 1080i.

SA never had a box that only supported 1080i.  The earlier models had  
1080i output only, but had no trouble internally converting 720p.   
Believe me 'cause I've had just about every single one of them, plus  
a friend who was the VP of Technology at my cable company.

> To the best of
> my knowledge, Cox now passes through the bits they get; and to the
> best of my knowledge the local CBS affiliate is using the entire
> transport stream for CBS HD broadcasts.

"To the best of your knowledge" is a guess.

> This is simply the
> reality of pushing 1080i beyond what is desirable given the
> application and the available bandwidth.

Yet 1080i football looks better to my eye (primarily sharper), and  
I'm hardly a sole voice in the wilderness here, either.  Hockey too  
has looked better to me in 1080i versus 720p.

But don't assume I'm pro-1080i or anti-720p as everything I do at  
work is 720p, which was my choice.
 
 
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