[opendtv] Re: Format Independence
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 10 Nov 2005 01:44:09 -0800
Also at the MPEG-2 encoder end. Most (if not all) encoders need
to be restarted when switching formats.
Some encoders can switch 1080i horizontal resolution on the fly
(between 1920, 1440 or 1280 wide). However, it's another
decoder compatibility issue as to how seamless the resolution
switch is.
Ron
Mark Schubin wrote:
>The problem is on the consumer end. Some early receiver/decoders froze
>when there were format changes. Rest assured that a good entropy coder
>doesn't waste bits on what isn't really there.
>
>TTFN,
>Mark
>
>
>dan.grimes@xxxxxxxx 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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