[opendtv] Re: Format Independence
- From: "Stephen W. Long" <longsw@xxxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 24 Dec 2005 08:50:53 -0500
Dan,
An engineer at a major network explained it to me this way - do you want to
risk losing eyeballs (customer changes the channel) every time you go to a
commercial or come back to a program? Since there is no guarantee
whatsoever that consumer equipment will properly behave when different
formats are received (my CRT HDTV goes blank every time the format changes
BTW), the broadcaster can only control his end - thus upconvert or cross
convert every signal to your base "master" signal. MPEG-2 encoders and
decoders know how to recognize 24P material that is doubled (3/5) to fit in
60P, so very little bandwidth is actually wasted.
Stephen
At 06:21 PM 11/9/2005 -0800, you wrote:
>
>In response to some of the discussion about formats, I have another
>question. Why do broadcasters put out a fixed format stream when at the
>production level the format is different. For instance, if Fox puts out
>720@60P all the time, and the original production content is 24P, why would
>the broadcaster waste bits by sending several frames of the same picture?
>Why not send out 720@24P and use the 19Mb/s to send a less compressed
>picture? Or how about when a 640x480@30i is sent out 720@60P? Is it a
>problem with the master control switcher only switching one format, or the
>server, or is the problem on the customer's end (like the monitor won't
>naturally switch)? Is it simply easier that way? I would think a lot of
>efficiency could be gained there.
>
>Dan
>
>
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