[linux-dvb] Kaffeine universal DVB-T scan file

Mauro Borghi mauro.borghi at telecomitalia.it
Mon Apr 16 11:54:03 CEST 2007

Dear Christoph, all,

Christoph Pfister wrote:
> Hi,
> 2007/4/14, P. van Gaans <w3ird_n3rd at gmx.net>:
>> Say you live in The Netherlands. Frequencies change here all the time,
>> and QAM settings and stuff also change all the time. Say you're living
>> on the border, like me. I receive channels from The Netherlands and
>> Belgium at the same time, but there's no scan file for that. There will
>> also always be locations missing in the list.
>> And what if you simply have no clue about where you live? Nobody thinks
>> of them! Then again, nobody knows where they are ;-)
>> So here is the solution: a file that'll make Kaffeine scan all UHF
>> channels with "AUTO" for the QAM and other stuff, will be sufficient in
>> most countries although scanning takes a bit longer.
>> I hope it makes it into some next version of Kaffeine :).
>> Pim
> <snip>
> There are enough cases where such a file doesn't work (think of
> offsets, 7 mhz transponders etc). Responsible for such complete
> scannings are the apps (kaffeine has auto scan which does pretty much
> the same as your file does and it tries offsets iirc).
> Christoph
I think dvb-t scan files should be organized in 3 "levels":
1. specific location
2. specific country
3. most general case

For 1. the scan will be fast, because only frequencies known to be 
active will be scanned - and most params will be known.

For 2., we should refer to the frequency allocation plan of a given 
country, so that all possible frequencies (and bandwidths) are listed - 
with other params left to autodetection.

3. should be the union of all known center frequencies used somewhere, 
listed more than once if other params may change (e.g. bandwidth 6 or 7 
or 8 MHz). The scan will probably be very slow, but the goal is to 
maximize the chance to get all available muxes.

When the scan file for your specific location  (1.) is not present or 
does not work, you can try 2., and if 2. is not enough you could try 3.


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