[opendtv] Re: Finally anamorphically compressed 480i

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 1 Feb 2011 20:24:34 -0500
----- Original Message ----- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx> 
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, February 01, 2011 5:01 PM
Subject: [opendtv] Re: Finally anamorphically compressed 480i
Now that TV cameras can output progressive, and that all US TV receivers out there are perfectly happy receiving progressive (e.g. 480/24p, 480/30p, and 480/60p), why don't the anti-interlace folk out there put their money where their mouths have been? 



Bert,
For a myriad of economic reasons, that will happen only when production moves to HD. It doesn't make sense to completely rebuild a television station only to produce progressive standard definition. Also, yes, 480p60 is an emission standard, but it is not an SD-SDI format. So in order to use 480p60 in a plant, you have to go with 720p60 and only use part of the video frame. Extremely messy and no standard equipment is available to do it. It's either 480i30 (either widescreen or 4:3), or one of the two standard HD formats.
Yes, in my experience (and that of other PBS stations,) 720p compresses much more efficiently than 1080i, especially when we bit starve it for a four channel multiplex.
For our eventual move to HD production, when we can scrape up the $1.5 million or so to build an HD studio, I voted for 720p, but was overridden by management in favor of 1080i, because it is "better" and because it is what PBS chose. 

Sigh.

John



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