How are Freeview channel numbers assigned?

Paul Webster

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Dec 30, 2002, 12:55:23 PM12/30/02

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Is there some sort of relationship between a channel number and a PID?

Looking at dump of data from Nebula card.
As an example:
BBC ONE - channel 1 - PID 43 10
BBC TWO - channel 2 - PID 83 10
ITV 1 - channel 3 - PID 01 01 - Prog ID 4e 20
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Rgds
Paul Webster

Paul Webster

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Dec 30, 2002, 3:19:42 PM12/30/02

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Paul Webster <paul.w...@spidersweb.freeserve.spammenot.co.uk>
wrote:

I just got a response from Nebula - basically ... their assignment is
hard-coded for first 5 channels and then alphabetic by channel name
(letters first). So - the traditional "channel" number is not
something that comes over the air.

How do people with ViedoPlus work it out - is there some sort of
agreement about which channels get which base number and then the same
is used for Sat and DTT?
--
Rgds
Paul Webster

Richard Revis

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Dec 30, 2002, 3:47:10 PM12/30/02

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Paul Webster used a team of monkeys to generate this reply:

> Looking at dump of data from Nebula card.

Since a Nebula card is probably a TV card for a computer, PID would stand
for process ID. I have no idea why each channel would be assigned a PID
though, unless it decoded them all at once.

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Anthony

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Dec 30, 2002, 5:22:46 PM12/30/02

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"Richard Revis" <spamsentto...@bottest.com> wrote in message
news:auqbje$9ejjk$2...@ID-126341.news.dfncis.de...

> Paul Webster used a team of monkeys to generate this reply:
>
> > Looking at dump of data from Nebula card.
>
> Since a Nebula card is probably a TV card for a computer, PID would stand
> for process ID. I have no idea why each channel would be assigned a PID
> though, unless it decoded them all at once.

A PID is a packet identifier. Digital TV channels have a number of PIDs
including a VPID (video) and a APID (audio). Basically they tell the
receiver where to look for the audio, video, teletext, conditional access
etc.

BTW this is all from a non-techie person, I just know enough to get by.

M Taylor

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Dec 30, 2002, 5:23:28 PM12/30/02

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From what I understand, there is something called a Logical Channel Number
(LCN), which is broadcasted over the airwaves. www.dtg.org.uk explains
briefly on the postcode predictor.

That is what decides what channels go where in the line-up for nearly all
set-top boxes.

If the Nebula card doesn't use this system, maybe someone should e-mail them
asking whether they'll add this to the software. If anyone does e-mail
them, please post the answer here, coz i'm quite interested in their
response if they say no. I think it'd be another thing that would make
their software far superior to hauppauge's.

Mk

Paul Webster

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Dec 30, 2002, 5:44:36 PM12/30/02

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"M Taylor" <>email...@yahoo.co.uk> wrote:

Their reply to me referred to upcoming support of sorting by LCN.
--
Rgds
Paul Webster

Stephen Neal

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Dec 31, 2002, 5:44:39 AM12/31/02

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"Paul Webster" <paul.w...@spidersweb.freeserve.spammenot.co.uk> wrote in
message news:hj111vkuvqsf7dg0j...@4ax.com...

There is a table which is broadcast as part of the PS data on DVB-T that I
believe maps the various video, audio, teletext, data and other PIDs (Packet
IDs) together to form a service. This table contains a Logical Channel
Number - the number allocated by the DTT managment team in the UK to each
service for the user to select. However unlike DSat it is possible for a
DTT receiver to receive more than one copy of the same - or similar but
different region - so the receiver has to cope with this.

> --
> Rgds
> Paul Webster