[mythtv] Ticket #8758: [TRIVIAL PATCH] Correction to the Danish DVB-T frequency table

[Kenni Lund]

2010/8/10 MythTV <mythtv at cvs.mythtv.org>:
> #8758: [TRIVIAL PATCH] Correction to the Danish DVB-T frequency table
> -------------------------------------------------------------------+--------
>  Reporter:  Kenni Lund [kenni at mythtv dot dk] <kenni@…>          |           Owner:  janne
>     Type:  patch                                                  |          Status:  new
>  Priority:  minor                                                  |       Milestone:  0.24
> Component:  MythTV - DVB                                           |         Version:  Trunk Head
>  Severity:  medium                                                 |      Resolution:
>  Keywords:  DVB-T frequency table Denmark                          |   Ticket locked:  0
> -------------------------------------------------------------------+--------
>
> Comment (by wirbel):
>
>  Replying to [ticket:8758 Kenni Lund [kenni at mythtv dot dk] <kenni@…>]:
>  > The settings of the current DVB-T frequency table for Denmark is too
>  specific to find all available channels. The attached patch should solve
>  this.
>  >
>  > The following changes are made with the patch:
>  > {{{
>  > HP code rate "2/3" -> "Auto" (FTA broadcaster "DigiTV" uses 2/3, but the
>  commercial broadcaster, BoxerTV, uses 3/4)
>  > LP code rate "None" -> "Auto" (Copenhagen local broadcaster uses 1/2)
>  > QAM "64" -> "Auto" (DigiTV and BoxerTV uses QAM64, but CPH local
>  broadcaster uses QAM16)
>  > Guard Interval "1/4" -> "Auto" (DigiTV and BoxerTV uses 1/4, but CPH
>  local broadcaster uses 1/16)
>  > }}}
>  >
>  > The attached file, channel.conf, shows a full scanning made with w_scan,
>  which found 51 channels in total, from all of the three mentioned
>  providers. After applying the attached patch to MythTV, MythTV found all
>  51 channels as well.
>
>  Actually it's a bad idea, since your change will break tuning for cards
>  not supporting 'AUTO' for those fields.

Hmm, as an anonymous user already has commented, shouldn't this be
considered a driver issue, which should be reported and fixed outside of
MythTV?

If you want me to, I suppose I can change the patch to cover the same
frequency range several times with the different parameters known in
my area, but IMHO the "Auto"-solution is more correct and should work
universally and not only in my region.


> The change to LP code rate doesnt
>  change anything at all, since there is actually no location known to use a
>  DVB-T low priority stream (LP is not used, it doesnt matter what you put
>  there).

Have a look at the attached channel.conf, line 13 and 14, LP and HP
doesn't use the same code rate:
FEC_3_4:FEC_1_2

This is not something I have specified, it was set by the automatic
full scan made by w_scan. I haven't looked further into these
channels, but as i read it, LP is in use here.


>  Applying this patch will force opening new bug reports from users whose
>  dvb cards will not tune anymore.

No, I made the initial Danish frequency patch myself and it was added
to trunk after the release of 0.23. So nobody with a stable (eg. not
0.24 trunk) MythTV setup have ever used this Danish DVB-T frequency
table.


Best Regards
Kenni
MythTV.dk