[opendtv] Re: A/53C PID requirements for Jan 1, 2005
- From: <tjharvey@xxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 22 Dec 2004 15:06:01 -0500
I made the change at our station about six months ago. I would advise using
your transport stream monitor and examining closely that the MPEG Transport PSI
tables are in agreement with the ATSC PSIP tables.
After the change (we were following the ATSC A/58 recommendation of starting
from program 2 (eg PMT 0X20 Video/PCR 0X21 etc) we found that about half of our
receivers immediately found the new paradigm and the others needed to be
rescanned and were fine. However, as we discovered in the past, if there was
any misalignment between MPEG PSI and ATSC PSIP MGT then you would have
problems.
Also, it is important to ensure that other descriptors are correct. We had a
problem earelier when the TSID in the PMT did not match the TSID in the TVCT:
in this case some receivers would not display but would acknowledge presence of
a program!
The only real answer is to use you stream analyser and examine closely for
discrepancies.
Terry Harvey
>
> From: Mark Aitken <maitken@xxxxxxxxxx>
> Date: 2004/12/22 Wed AM 10:09:43 EST
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: A/53C PID requirements for Jan 1, 2005
>
> I (too) am trying to confirm issues with receivers. What makes it so
> difficult is the lack of understanding (even on the part of the
> Broadcast vendors) of what is "correct", and what MAY "work".
> Ron Economos wrote:
>
> >William Smith wrote:
> >
> >
> >
> >>Ron,
> >>1. What model receivers are having trouble?
> >>
> >>
> >>
> >>
> >The receivers that stopped working were the
> >Toshiba DST-3000, the VOOM stb, the
> >USDTV stb, the Hitachi 51S700 integrated
> >tuner HDTV and some PC tuner cards.
> >
> >A few stb's reverted back to the RF channel
> >number and showed the MPEG-2 Program
> >number as the sub-channel (24-3 and 24-4).
> >
> >The LG-4200A, Zenith HD-SAT520, RCA DTC-100,
> >Sony HD-300 and my own Samsung SIR-T165 had no
> >problems at all.
> >
> >
> >
> >>2. Did the TVCT get updated with the new informaion and a new version
> >>number?
> >>
> >>
> >>
> >>
> >I' don't work for KGO, but I am the MPEG-2 Transport Stream
> >expert at LSI Logic (formerly C-Cube), so I was just trying to
> >help out. However, it looks like they got some help from the USDTV
> >folks and the problem appears to be solved as of 3 pm Tuesday
> >(and they are still using Program numbers 3 and 4). If I find out
> >what the actual problem was, I'll post it here. A TVCT mismatch
> >seems highly possible.
> >
> >Ron
> >
> >
> >
> >>William
> >>KET
> >>
> >>
> >>Ron Economos wrote:
> >>
> >>
> >>
> >>
> >>
> >>>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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> >
>
> --
>
> Regards,
> Mark A. Aitken Director, Advanced Technology
>
> ***********************************
> Sinclair Broadcast Group
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