[mythtv] Ticket #8758: [TRIVIAL PATCH] Correction to the Danish DVB-T frequency table
Kenni Lund
kenni at kelu.dk
Tue Aug 10 23:54:48 UTC 2010
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
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