[opendtv] Re: Redefining anamorphic
- From: "Adam Goldberg" <adam_g@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 10 Mar 2008 14:41:59 -0400
You need three things to be able to do anything useful automatically: (1)
Information about the display, (2) information about the coded picture size,
and (3) information about where in the coded picture, the 'active picture'
is.
Yes, of course, in order to effectively (automatically) use AFD or bar data
it's the receiver that's doing the work, and it's gotta know what the
display looks like. It's axiomatic.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Manfredi, Albert E
Sent: Monday, March 10, 2008 1:51 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Redefining anamorphic
Adam Goldberg wrote:
> Bar data may be present in combination with AFD. This /is/
> sensible, because receivers may elect to implement only AFD
> processing (and not bar data), and other receivers may do
> otherwise (yielding a more precise screen-filling via bar
> data).
>
> Bar data is not a substitute for AFD. It is a more precise
> way of signaling approximately the same thing. It makes by
> far the most sense for content to be signaled with either
> (1) no AFD/bar data, (2) AFD only, no bar data, or (3) AFD
> and bar data. (Inverse order of preference).
Seems to me that the two indeed must be complementary for the system to
be of any use.
Also, bar data supports any image aspect ratio, but it doesn't do
anything to accommodate the difference between a 4:3 or a 16:9 display
at the receiving end. This last must either be done manually by the
viewer, or by AFD.
Bert
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