[opendtv] Re: Time to give up on 1080i for football
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 8 Dec 2009 12:35:30 -0500
Mike,
I'm sorry, then I missed your point regarding ATSC and VBR. VBR of a single
stream is useful on a storage medium because the total capacity of the storage
medium is fixed, and VBR can be used to maximize the program length held within
that fixed capacity.
VBR on a single transmission stream, where the limiting factor is the
transmission rate, would only result in increased null packets to stuff the
transport stream.
Therefore it would be pointless to apply VBR to a single ATSC program.
However, VBR does exist in multiplexed ATSC streams, as we both apparently
agree.
John
----- Original Message -----
From: Mike Tsinberg
Sure. The end result of four multiplexed VBR streams into one creates one
CBR stream. Yes that is one case of VBR for broadcasting. What I meant is
transmission of a single HDTV stream that occupies complete channel for maximum
picture quality.
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