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

[Paul Hampton]

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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