On Sat, 28 Feb 2009 22:42:02 +0000 (GMT) Dominic Morris dom@suborbital.org.uk wrote:

On Sat, 28 Feb 2009, Tony Houghton wrote:

...

I haven't checked BATs or EITs yet, but Freeview seems to use standard pids (from ETSI EN 300 468) for PATs, PMTs, SDTs and NITs. The standard BAT pid is 0x11 so I don't see how simply adding 3800 works :-/.

Sorry, my head obviously isn't with it, but that's where the BAT is, if you dvbsnoop on pidscan mode you'll find the other tables in that range as well.

AFAIR, the EPG takes about 30 minutes to populate

Except on one particular transponder apparently, where it's more like 30 seconds.

I'm trying to write a channel scanner (and later on an EPG scanner) that can handle Freesat nicely, but these non-standard PIDs are a pain. I found another useful DigitalSpy post http://www.digitalspy.co.uk/forums/showthread.php?t=971793 which tells you how to find the PIDs. The trouble is this only finds NITs with table_id 0x41 (other network) and SDTs with PID 0x46 (other transport stream). I haven't checked the NITs yet to see whether they're still useful, but the SDTs only contain channels from other transponders, so at best my scanner will have to maintain a lot of data across multiple transponders instead of being able to neatly package each set of channels with its own transponder. Also, all the sections have a section_number of 0 even though they carry different data, so the only way of knowing when you've got a complete set (from the current transponder) is by seeing whether you've already received that data and trust their transmission order hasn't changed.