[opendtv] Re: (no subject)
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 08 Dec 2009 14:04:13 -0500
dan.grimes@xxxxxxxx wrote:
> "If we are really to believe that 1080/60p takes up no more channel
> capacity than 720/60p, then we are also claiming that 720/60p takes up no
> more channel capacity than 480/60p, and by logical extension, 1080/60p
> takes up no more channel capacity than 480/60p." -Bert
>
> Your "If A=B and B=C then A=C" logic is infallible. But your premise that
> anyone thinks A=B is absurd.
>
I don't at all think A=B in that case.
But, even if it did, that does not at all imply the second step, B=C.
Imagine the case where for some reason there was no fixed overhead and
yet NOTHING was ever encoded with an effective source resolution greater
than that of 720p. This could happen because of poor cameras &
telecines or simply because everything in the world was for some reason
brick wall filtered to 720 rez, even if encoded at 1080p.
In the above extreme case and without extra per block overhead it could
(almost) be claimed 1080 = 720. But that would still say nothing about
whether 720 = 480.
So it was the second step of the logic I was disputing since B=C
appeared as an intermediate conclusion, not a premise.
- Tom
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