[mythtv-users] DVB-T slow to change channel in 0.18 (ubuntu package)

RoboJ1M jim.neave at googlemail.com
Thu Apr 6 12:06:38 UTC 2006


Yes, after some thought I'm sticking with it until:

1) 0.19.1 is released
2) Dapper Drake with 0.19 binary packages is out

I'll just have to get the EPG 2 XMLTV working and hope that the new DVB EPG
support in 0.19 does clash too much.

Thanks,

J1M.

On 4/6/06, Paul Hampton <paul.hampton at gmail.com> wrote:
>
> I'm having some problems with DVB-T and 0.19 so I'd advise you to hold
> fire. Basically, I can no longer watch anything recorded in mpeg2, I have to
> wait for it to be transcoded to mpeg4 first. There's some great stuff in
> 0.19 , however this bug stops me watching something that is still
> recording, which is important for me (may not be for you though)
>
>
> On 06/04/06, RoboJ1M < jim.neave at googlemail.com> wrote:
> >
> > Even easier with DVB, as the live feed is already encoded.
> > But I imagine we have over simplified somewhat.
> >
> > I've just got 0.18 working, using the ubuntu breezy package.
> >
> > I'm very tempted by upgrading, but the thing is...
> >
> > ...it's working.
> >
> > Well, I can watch TV, I need the EPG2XMLTV soft next, although I notice
> > this is native in 0.19
> > And that the live tv has had a major re-write.
> >
> > Argh, tempting. And I have a working build enviroment..
> >
> > But you know everything will stop working the second I touch it.
> > I mean, all of the plugins are packages too, they're going to break too
> > arn't they?
> >
> > J1M.
> >
> >
> > On 4/6/06, Randy Robertson <rmrobert at usc.edu> wrote:
> > >
> > > As far as I know, all the TV cards can change channels fast (verify by
> > > using tvtime or some plain tv viewer), the problem is that in order to
> > > have seamless livetv pausing/ff/rw, etc, you are really watching a pre
> > > encoded stream that was saved so you are few seconds behind live, so
> > > changing channels means buffering this up again, and it takes the 2-3
> > > seconds that you are behind live tv when you change channels.
> > >
> > > With a hypothetically fast enough computer, I don't see why you can't
> > > dump the video data from the card to shared memory, and have one
> > > thread playing "live" (without anywhere near 2-3seconds delay) and
> > > have another thread doing the encoding.  Then, if you do pause- when
> > > you resume, do so from the encoded version, and when ever you change a
> > > channel go back to the "live" video dump.
> > >
> > > The process used to be even slower, since changing channels involved
> > > more overhead with the old ring buffer method. So, if you aren't
> > > already- make sure you are running 0.19.
> > >
> > > I'd also be interested in knowing how commerical PVRs, like the TIVO
> > > deal with this issue. I assume they can change channels
> > > instantaneously, but maybe not?
> > >
> > > For now, the preferred method for channel "surfing" is to use the OSD
> > > to quickly view channel info, without pressing "enter" until you find
> > > the one you want.  Or use the guide. But of course, you don't know if
> > > the show is on commercial, etc. until you switch.
> > >
> > > Even if my method above isn't possible for some reasons I don't
> > > understand, it should be fairly trivial to quickly change channels if
> > > you have two tuners, and don't mind having them both in use on one
> > > channel.  Just encode the channel with one tuner, and watch it "live"
> > > ala tvtime as described above.
> > >
> > > On 4/6/06, RoboJ1M < jim.neave at googlemail.com> wrote:
> > > > Damn, thats a shame.
> > > >
> > > > At £33 that's only £100 for 3 tuners!
> > > >
> > > > + 3 free IR receivers and controllers!
> > > >
> > > > Is it a complete no hoper? Meaning that it's a hardware limitation?
> > > >
> > > > J1M.
> > > >
> > > >
> > > >  On 4/6/06, Michael Fox <fox.michael at gmail.com> wrote:
> > > > > On 4/6/06, Jim Neave < jim.neave at googlemail.com> wrote:
> > > > > >
> > > > > > Is that normal?
> > > > > >
> > > > >
> > > > > Its normal.
> > > > >
> > > > > I use VP-3020C tuners and it does the same thing.
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