[opendtv] Re: A/53C PID requirements for Jan 1, 2005
- From: johnwillkie@xxxxxxxxxx
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 22 Dec 2004 21:44:09 -0800 (PST)
Ron;
You might have put the cart in front of the horse. To analyze the
problem, I'd first like to know if the pids in the EIT-0 match those in
the appropriate PMT instance, and if the appropriate information in the
PAT matches the VCT.
I suspect that Mr. Turnbull & Company have done this correctly, but
there's no guarantee of that, until PATs, PMTs and PSIP are generated by
the same device, which is currently not the case.
If everything is ok on the transmit side, then it's a receiver problem.
It would be very interesing to know of the TV manufacturers who considered
the optional program paradigm to be mandatory, and the vintage of the
sets.
There might not be a workaround.
John Willkie
> As many of you know, ATSC A/53C has dictated
> that all PID assignments (except for PAT) will be
> numbered equal to or above 0x0030 after January
> 1st, 2005.
>
> At the same time, the "program paradigm" for PID
> assignment has been deleted. The "program paradigm"
> is in older versions of A/53, and assigns PID numbers with
> these formulas (where N equals the MPEG-2 Program
> Number).
>
> PMT = 16*N
> PCR = 16*N + 1
> Video = 16*N + 1
> Audio = 16*N + 4
>
> One of the local DTV stations here in the SF Bay Area,
> KGO-DT, has fulfilled the equal to or above 0x0030 PID
> requirement by changing their Program Numbers from 1 and 2
> to 3 and 4 and continuing to use the old "program paradigm".
> This results in PIDs 0x0030, 0x0031, 0x0034, 0x0040, 0x0041
> and 0x0044.
>
> This has caused some receivers to display a black screen
> and no audio when tuned to KGO-DT. No amount of
> re-scanning will resurrect these receivers.
>
> So the question to the group is:
>
> What is the safest way to satisfy the equal to or above 0x0030
> requirement? Since the "program paradigm" has been deleted,
> should MPEG-2 Program Numbers now start at 1 (instead
> of the previously recommended 2)?
>
> Thoughts and experience would be appreciated.
>
> Ron
>
>
>
>
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