[opendtv] Re: A/53C PID requirements for Jan 1, 2005
- From: William Smith <wsmith@xxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 22 Dec 2004 15:53:56 -0500
Minor Correction..
TSID is in the PAT not the PMT...
William
tjharvey@xxxxxxx wrote:
> 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
>>
>>***********************************
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----
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Technology Division ----------------------
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