[mythtv] Freesat channel numbering
Stuart Auchterlonie
stuarta at squashedfrog.net
Fri Jul 25 11:37:15 UTC 2014
On 13/07/14 16:02, Steve Hill wrote:
>
> I've been reverse engineering the Freesat DVB-S data carousels in order
> to automatically set the channel numbers on my MythTV box. I thought
> this might be of interest to other people, so:
>
> The code is available through Subversion:
> http://subversion.nexusuk.org/projects/freesat-channels/
>
> Shut down mythbackend before running the code, since it needs access to
> the DVB card. You'll need dvbtune and dvbsnoop installed too.
>
>
> Freesat does regionalisation on two levels - firstly the channels are
> split into (currently) 12 bouquets:
> - England SD
> - England HD
> - England G2
> - Wales SD
> - Wales HD
> - Wales G2
> - Scotland SD
> - Scotland HD
> - Scotland G2
> - Northern Ireland SD
> - Northern Ireland HD
> - Northern Ireland G2
>
> Within the bouquets there is some further regionalisation through
> proprietary tables of region IDs.
>
What we need to do is add the Bouquet handling to mythtv channel
scanner, and then we can do this automatically. Theoretically it
shouldn't be that difficult.
Regards
Stuart
>
> Some gotchas I haven't figured out yet:
>
> Some channels just don't seem to be listed in the Freesat data at all -
> for example, Channel 4 and the radio stations all seem to be missing.
> Maybe they're encoded elsewhere that I haven't spotted yet...
>
> Some channels are labeled with region ID 0, and I haven't figured out
> what this means. Multiple channels seem to end up assigned to the same
> channel number in region 0, and the channels often don't seem to make a
> lot of sense - e.g. in the Wales SD bouquet, BBC One London, BBC One
> West Midlands and BBC One South all get assigned to channel 101 in
> region 0. BBC One Wales doesn't seem to be listed at all.
>
> If anyone has a real Freesat receiver (especially in Wales, Scotland or
> Northern Ireland), I would be interested to know what regional channels
> get assigned to numbers 101 and 108.
>
>
> There's some further information on the reverse engineering on my blog
> here: http://blog.nexusuk.org/2014/07/decoding-freesat-part-2.html
> If anyone knows anything relevant about the Freesat data I would be very
> interested - information seems quite thin on the ground on the internet.
>
>
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