[mythtv-users] PCTV 292e DVB-T2

[Andrew Wilkinson]

Hi Chris,

I have the same issue with my TBS 6281 using the open source drivers. Using
dvd-fe-tool I can see that it advertises itself as having a DVB-T2 mode. As
you point out there appears to be a hack in MythTV for DVB-S/S2. I also
have a TSB 6982 which works fine for both S and S2 multiplexes. So it's
certainly not just the driver for your tuner that has this issue.

Unfortunately I suspect the code may need to be changed elsewhere as well
because I cannot chose the correct settings in mythtv-setup to tune into a
dvb-t2 multiplex.

Regards,
Andrew


On Thu, Nov 20, 2014 at 1:19 PM, Chris Simmons <
cps-mythtv-users at corefiling.co.uk> wrote:

> I recently emailed about DVB-T2 tuners and contrary to what I initially
> said I got a PCTV 292e tuner :)  I am fickle...
>
> I'm using 3.17.2-200.fc20.x86_64 (fedora 20) and there's an in kernel
> driver which basically works.
>
> - It tunes in to DVB-T stuff fine including in mythtv
> - but DVB-T2 multiplexes don't work in mythtv
> - dvbv5-zap in Fedora 20 crashes but
> - I've compiled latest v4l-utils and with this dvbv5-zap works and I
> recorded some HD stuff off a DVB-T2 multiplex yay!
>
> So that's pretty good, it basically works but sadly mythtv doesn't work on
> the DVB-T2 multiplexes.  I'm sure I've got the right multiplexes because I
> previously had them working on a PCTV 290e.  I see similar behaviour in
> that tzap doesn't work with this device for the T2 multiplexes, I think
> because it isn't using the dvb v5 APIs.
>
> Has anyone got this working?
>
> Summarizing the blog and associated links starting here
>
> http://www.linuxtv.org/wiki/index.php/PCTV_Systems_
> tripleStick_T2_%28292e%29
>
> I think what's happened is that the guy who wrote the driver didn't want
> to hack it so that it switched to DVB-T2 mode automatically. Whether this
> is a reasonable position to take I can't really say but that's how it is
> for better or for worse.  I've been rooting around the mythtv code a bit
> and it seems that there isn't support for marking a tuner as DVB-T2 and/or
> using the DVB-T2 modulation system.  It does, on the other hand, certainly
> special case DVB-S2 vs DVB-S.  There's code like this in dtvmultiplex.cpp
> but nothing analogous for DVB-T vs DVB-T2:-
>
>     // For #10153, guess at modulation system based on modulation
>     if (DTVModulationSystem::kModulationSystem_UNDEFINED == mod_sys)
>     {
>         mod_sys = (DTVModulation::kModulationQPSK == modulation) ?
>             DTVModulationSystem::kModulationSystem_DVBS :
>             DTVModulationSystem::kModulationSystem_DVBS2;
>     }
>
>
> I'm reading between the lines a bit but I think the solution might be to
> have a similar switches for DVB-T vs DVB-T2.
>
> I'd be happy enough if I could get it working only on DVB-T2 multiplexes
> only as I've got a dual DVB-T tuner.
>
> Am I on the right track here?  Any hints?
>
> Cheers,
>
> Chris Simmons.
>
> PS If I do start hacking up mythbackend to get it working I'd rather do it
> on a test system.  Would I have to put it on a different subnet?  Is this
> best done in a VM?
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