[opendtv] Re: Finally anamorphically compressed 480i

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Sun, 23 Jan 2011 19:12:00 -0600

Craig Birkmaier wrote:

> John Shutt wrote:
>>
>> Since PBS doesn't send SD to their member stations, legacy full
>> screen SD material is sent as pillarboxed 4:3 within a 1080i30
>> frame, with the appropriate AFD code "center cut safe."  If that
>> content is broadcast on an HD channel to the viewer, the AFD
>> code is also transmitted.  If it is downconverted to SD by the
>> station for a subchannel, it should be center cut by the station
>> for a full frame 4:3 program.

> This is a messy conversion that involves deinterlacing the 480i
> source, upscaling to 1440 x 1080 then re-interlacing. Then this
> must be undone at the station...

But it shouldn't! How hard would it be to take that pillarboxed 1080i60 
material and transcode it to an identically pillarboxed, anamorphically 
squeezed, 704 X 480i60 stream? It doesn't seem like it should be difficult or 
ugly.

Then they can send that same AFD "center cut safe" if they must, just like it 
would be sent out over a 1920 X 1080i stream for any potential 4:3 receiver 
that supports AFD. (Not very likely!)

Bert
 
 
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