On Fri, 9 Mar 2018 11:55:02 +0100
Klaus Schmidinger <Klaus.Schmidinger@xxxxxxx> wrote:
> On 09.03.2018 11:51, Patrick Boettcher wrote:
> > On Fri, 9 Mar 2018 11:30:36 +0100
> > Klaus Schmidinger <Klaus.Schmidinger@xxxxxxx> wrote:
> >
> >> On 01.03.2018 10:22, Patrick Boettcher wrote:
> >> > On Wed, 28 Feb 2018 11:01:23 +0100
> >> > Klaus Schmidinger <Klaus.Schmidinger@xxxxxxx> wrote:
> >> >
> >> >> On 27.02.2018 17:58, Patrick Boettcher wrote:
> >> >> > On Tue, 27 Feb 2018 16:54:35 +0100
> >> >> > Klaus Schmidinger <Klaus.Schmidinger@xxxxxxx> wrote:
> >> >> >
> >> >> >> Hello Patrick,
> >> >> >>
> >> >> >> your scan doesn't contain the NIT, which is where the
> >> >> >> transponder innformation is broadcast. Can you scan that,
> >> >> >> too, please?
> >> >> >
> >> >> > Hi Klaus,
> >> >> >
> >> >> > NIT attached (from another multiplex with the same
> >> >> > symptoms).
> >> >>
> >> >> DVB-DescriptorTag: 90 (0x5a) [=
> >> >> terrestrial_delivery_system_descriptor] descriptor_length: 11
> >> >> (0x0b) Center frequency: 0xffffffff (= 42949672.095 kHz)
> >> >>
> >> >> @@ -219,6 +219,8 @@
> >> >> cDvbTransponderParameters dtp;
> >> >> int Source =
> >> >> cSource::FromData(cSource::stTerr); int Frequency =
> >> >> Frequencies[0] = sd->getFrequency() * 10;
> >> >> + Frequency = Transponder() * 1000000;//XXX
> >> >> + dsyslog("Frequency = %08X, Transponder = %d",
> >> >> sd->getFrequency(), Transponder());//XXX static int
> >> >> Bandwidths[] = { 8000000, 7000000, 6000000, 5000000, 0, 0, 0,
> >> >> 0 }; dtp.SetBandwidth(Bandwidths[sd->getBandwidth()]); static
> >> >> int Constellations[] = { QPSK, QAM_16, QAM_64, QAM_AUTO };
> >> >
> >> > It works. I had to have VDR recreate the channels because it was
> >> > mixing things up with the already existing ones.
> >> >
> >> > As to why the frequency is set to "-10" I don't know (yet), but I
> >> > remember it has always been like this since 2005.
> >> >
> >> > Initial tuning files have always contained all active frequencies
> >> > for their region, because the NIT did not set the center
> >> > frequencies correctly.
> >> >
> >> > It might be because the multiplexed transport streams are
> >> > generated centrally and then distributed to all the
> >> > base-stations where they are emitted as-is but on different
> >> > frequencies depending on the region.
> >> >
> >> > What can we do to get this upstream?
> >>
> >> I'm afraid I don't see how this case can be handled correctly.
> >>
> >> Maybe somebody else has an idea?
> >
> > One approach might be to ignore frequencies for DVB-T channels
> > update during NIT parsing (in France only?).
> >
> >>From my experiences with DVB-T SetTopBoxes using the NIT for
> > new channel-discovery is rarely done. No customer of my ex-employer
> > was using it - scanning was entirely based on continuous
> > frequency-band scanning with a spare demod.
> >
> > That would be my idea. But I don't know whether this can be easily
> > applied to VDR.
>
> Well, maybe this works for you?
>
> --- nit.c 2016/12/23 14:16:59 4.4
> +++ nit.c 2018/03/09 10:53:38
> @@ -218,6 +218,8 @@
> SI::TerrestrialDeliverySystemDescriptor *sd =
> (SI::TerrestrialDeliverySystemDescriptor *)d;
> cDvbTransponderParameters dtp; int Source =
> cSource::FromData(cSource::stTerr);
> + if (sd->getFrequency() == 0xFFFFFFFF)
> + continue;
> int Frequency = Frequencies[0] =
> sd->getFrequency() * 10; static int Bandwidths[] = { 8000000,
> 7000000, 6000000, 5000000, 0, 0, 0, 0 };
> dtp.SetBandwidth(Bandwidths[sd->getBandwidth()]);
This is what I'm doing right now (though I'm using break instead of
continue).
But won't his inhibit the update of modulation parameters of the
_current_ channel?
--
Patrick.
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