[opendtv] Re: New Philips HDD/DVD recorder
- From: "Adam Goldberg" <adam_g@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 27 Dec 2007 14:30:40 -0500
I believe this is an error. There's a difference between "AFD" and "Bar
Data". AFD has a fixed set of active-size-in-picture-size settings. Bar
data describes essentially arbitrarily where the bars are (and hence, where
the active picture is).
I am unaware of anyone implementing bar data in receivers.
(I disagree with at least one of the 'mini-failures'; you could probably
guess which one)
Now then, as to what a non-AFD box delivers ... probably either columnboxes
(for 4:3 content in a 16x9 coded picture) or letterbox (for 16:9 content in
a 4:3 coded picture). AFD will tell a AFD-aware box where the active video
is and the AFD-aware box can Do The Right Thing.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of John Willkie
Sent: Thursday, December 27, 2007 2:10 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: New Philips HDD/DVD recorder
I agree, Mark. I was going to make a posting similar to John's last night,
but I realized that I was engaged in legacy thinking; afd is just as useful
with a 4:3 set as a 16:9 one.
AFD permits, as Adam alluded to, the broadcaster to dynamically define the
active video frame, and it's not just usable for signaling 16:9 or 4:3, but
1:2.21 and any other as well, and gives the receiver enough information to
figure out how to render the largest possible image based on the screen size
of the receiver.
The lack of it being mandatory -- to this point, anyway -- is another one of
those 'mini-failures' on the road to digital broadcasting, along with the
dialnorm dropped ball, the effective banning of multiple audio decoders (in
otherwords, seriously limiting AC-3 flexibility), lipsync and [add your
own.]
As for the coupon-box lack of afd, what do you expect of 'government
cheese?'
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Mark Schubin
Enviado el: Thursday, December 27, 2007 10:44 AM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: New Philips HDD/DVD recorder
John Shutt wrote:
> I don't think that is as big an issue since the NTIA coupons are
> intended for STBs to be used with NTSC 4:3 displays.
And if a broadcaster decides to use AFD to intermix 16:9 and 4:3
material, what does a non-AFD box deliver?
TTFN,
Mark
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