[opendtv] Re: White paper from CEA
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 31 Oct 2005 03:13:40 -0800
If cable companies do pass through PSIP, isn't it a bit of a PID
mapping problem? Let's say a QAM channel has two or more
ATSC programs from different stations in the mux. What PID
or PID's do you put the PSIP on? In ATSC, the PSIP PIP is
known a priori to be on 0x1ffb. But you can't put multiple PSIP
streams on PID 0x1ffb in the QAM multiplex, it would be an
undecipherable mess. At the same time, there's no other scheme
in the PAT or PMT to point to the PSIP streams if you want to
use multiple PID's.
My guess is that PSIP packets are tossed, and the lost information
may (or may not) be replicated in the cable EPG.
Ron
John Willkie wrote:
>DBS systems have superior EPGs. The issue is the accuracy of the
>information. I believe you are exaggerating about cable companies covering
>up station EPGs with their own, since this plainly IS A CRIME and the
>stations can even sue over it. The FCC rules say that cable systems have to
>pass on all "program-related information" for the terrestrial program
>stream(s) that they carry. Indeed, several crimes would be involved, since
>by covering up Event Information Tables, they would be denying viewers
>parental ratings and captioning information that stations are legally
>required to transmit as of 1/1/2005. Cable systems have less engineering
>and programming staff than most TV stations, it's a non-starter that they
>would hand-code ratings and captioning information.
>
>I believe you meant to say that many cable systems offer their own EPGs,
>which tend to favor cable-only programming.
>
>
>John Willkie
>
>
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