[opendtv] Re: Redefining anamorphic
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 6 Mar 2008 14:58:55 -0800
You may agree with what John described, but you didn't understand it.
There is nothing in ATSC specifications that "describes" video; everything
that "describes" video is contained in MPEG-2 video (-2). The data elements
are the SAR and DAR of which John spoke, and which you assert you agree
with, but clearly don't understand.
This isn't the time or place for rehashing what has been described on this
list many times over many years. Look in the archives for extensive,
previous discussions of SAR and DAR, oft-times involving John Shutt and
myself.
However, I will say, in a smarmy type of way, that you understand virtually
nothing about that which you purport to understand on this topic.
You have not provided a published (as in a standard) reference to
"anamorphic." Did you catch Ron also putting the term in quotes? I want to
know where the display and pickup lens (anamorphic) fit into this. Lacking
them, you are abusing the term anamorphic.
Hope that helps.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Manfredi, Albert E
Enviado el: Thursday, March 06, 2008 1:47 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Redefining anamorphic
John Shutt wrote:
> Since both 1280x720p and 1920x1080 i or p video is always 16:9, it
> is not standard industry practice to refer to it as "anamorphic."
> The term "anamorphic" is reserved for those formats that have more
> than one "native" aspect ratio, such as 720(704)x480.
I agree with everything you wrote previously, but am still stumped by
this one. Far be it from me to say what "industry practice" is or isn't.
My question would be, when 4:3 content is transmitted in the "main" or
"HD" subchannel of TV stations today, how is it described?
The way I see it, that 4:3 program is transmitted anamorphic. It needs
the 16:9 stretch, or it would appear as a really skinny and tall frame.
As opposed to the 4:3 content transmitted in the SD subchannels, which
is "non-anamorphic," however you call that, and must not get the 16:9
stretch.
In general, it seems that anything transmitted to wide screen TV "full
frame," c/should probably be called anamorphic. Even 4:3 content in an
HDTV frame. As opposed to letterboxed + pillarboxed widescreen content.
As you correctly stated, my position is that even today, all OTA
broadcasting could safely go to this "16:9 stretch always required"
mode, whatever you call it, in all subchannels.
And wouldn't it be nice if cable did the same thing. Maybe we would stop
seeing short and fat reporters in airport CNN screens!
For old 4:3 TVs, the ATSC STB can accommodate the needed adjustment
easily enough. Just as HDTV programs are accommodated no problem from
STB to 4:3 displays.
Bert
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