[mythtv-users] known issues related to DVB-T in Australia (was: Channel tuning broken in 0.24)

[Igor Cicimov]

On Tue, Jun 5, 2012 at 6:19 PM, Nick Rout <nick.rout at gmail.com> wrote:

> On Tue, Jun 5, 2012 at 8:01 PM, Jean-Yves Avenard <jyavenard at gmail.com>
> wrote:
> > On 5 June 2012 13:57, Igor Cicimov <icicimov at gmail.com> wrote:
> >
> >> This is my exact upgrade path:
> >>
> >> 1. From Mythbuntu 8.04 and MythTV 0.20 to Mythbuntu 10.04 and MythTV
> 0.23
> >> to
> >> - Here all worked fine and I even noticed slight improvement in tuning
> and
> >> LiveTV quality
> >>
> >> 2. From MythTV 0.23 to MythTV 0.24 (Mythbuntu 10.04)
> >> - Here the tuning brakes
> >>
> >> 3. From MythTV 0.24 to MythTV 0.25 (Mythbuntu 10.04)
> >> - Same
> >>
> >> Igor
> >
> > Sigh...
> >
> > Of course, something must have become broken in MythTV... What else
> could it be.
> >
> > There has obviously been no upgrade whatsoever to the DVB-T drivers in
> > the linux kernel in the past 4 years.
> > The change from ubuntu 8.04 to ubuntu 10.04 was of course a minor one,
> > and the only possible explanation on why scanning worked back over 4
> > years ago is due to change to the way mythtv scan channels..
> >
> > Interestingly, if you look at mythtv changes history, you would have
> > found that the channel scanner is probably the part of myth that has
> > changed the least in all those years, changes being mostly about
> > adding support for new frequencies...
>
> All of which makes it intriguing as to why lurking this list and
> mythbuntu forums seems to indicate more and more problems with
> scanning channels as time (and releases) goes on.
>
> Everyone says "not me" - but there is something going on, and it
> certainly is frustrating to a lot of people.
>
> Dissecting a multivariable problem to find which change in variable
> broke what and when is a real difficulty I know, but at some stage it
> needs to be sorted. (Which is easy to say...)
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>

Guys,

Please don't take this as attack on myth I never had any intention doing
that and I never will. I love myth and a problem tuning couple of channels
will not stop me using this great product. There are lots of awesome stuff
one can do with myth and it comes for free! My thread literally started
with the question "Does anyone know about any changes in MythTV or cx88-dvb
kernel driver that might affect the tuning of this card". I was not
winging, accusing or complaining I simply asked for other peoples
experience. And from couple of threads I've been following came out that
people in general have tuning problems with Leadtek WinFast DTV2000 H (my
is revision J).

Just for the record, editing the frequencies in the dtv_multiplex table ie
adding 125KHz to the transport, didn't make any difference for me. The
channels that have tuned fine are still tuning fine and the ones that
didn't still suck. This channels like GO and GEM can't acquire a proper
lock, come up with horrible picture for a second and lock the
frontend completely.

Igor
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