[mythtv] DVB Stability problems with watching live TV

[Damian Ivereigh]

On Mon, 2004-08-09 at 21:03, Ben de Luca wrote:
> Hi guys,
> 	I am in Australia (sydney) too and notice similar things.
> 
> Some things to note, from what I have found out and tried, I have two 
> visionplus cards running in my machine.
> 
> 1. DVB signal strength is usually really low here. I have LOS to the 
> towers with nothing in between, compared to people with same hardware 
> OS I have very low value.

For what it's worth I found an aerial amplifier worked wonders - even if
it doesn't improve the analogue picture. I think that is particularly
true with the VisionPlus cards.

> 2. I set the pci latency lower on other devices, and found some 
> improvement some thing is wrong with DMA but I cant find it yet. the 
> are cheap cards but hey? I got what i paid for.

Hmm, hadn't thought that it might be a hardware/firmware type thing.

> 3. Kenneth Aafloy submited a patch that got rid of my most constant 
> crash (once per day) with a patch a few weeks ago.

Cool, I'll go and check it out.

Damian

> 
> 
> On 09/08/2004, at 8:28 PM, Tim Ansell wrote:
> 
> > On Mon, 2004-08-09 at 18:42, Damian Ivereigh wrote:
> >> Hi guys,
> >>
> >> Has anyone else experienced stability/crashing problems when watching
> >> Live-TV with DVB cards?
> >>
> >> I have been using mythtv with a couple of Australian Nova-T DVB cards
> >> for the last few months. The recording and playback works great, rock
> >> solid.
> >>
> >
> > I'm here in Australia too!
> >
> >> However I have found a couple of wierd problems when watching live 
> >> TV:-
> >>
> >> 1) When switching channels, sometimes the player never gets up to 
> >> speed,
> >> staying at that slow speed it uses when trying to get the video and
> >> audio in sync.
> >>
> >
> > I have experienced this problem. It only ever seems to happen on 
> > Channel
> > 7. I'm in Adelaide, South Australia and am using a Vision Plus card.
> >
> >> 2) When the signal quality is a bit flaky (and the card temporarily
> >> loses sync), I have seen both the front and backend crash (at 
> >> different
> >> times). I realise that the solution is to fix the signal quality, but 
> >> I
> >> would prefer myth to handle this situation a bit better.
> >>
> >
> > I have also experienced this problem. Sadly it seems signal quality is
> > kinda lacking here in Australia, which is the whole reason I went
> > digital instead of Analog.
> >
> >> I am not looking for a fix (unless someone has one), rather to know if
> >> anyone else has experienced it. If so I will have a go at debugging 
> >> and
> >> fixing it.
> >>
> >> One simple change I would like to make is make the timeouts *much*
> >> shorter. Right now if you unplug the aerial, mythtv hangs for almost a
> >> minute. Frankly if you can't get sync in 5 secs, you may as well give
> >> up. What would be great would be an error message and allow you to
> >> change to a new channel.
> >>
> >> Comments?
> >>
> >> Damian
> > -- 
> > Tim Ansell <mithro at mithis.net>
> >
> > _______________________________________________
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> > mythtv-dev at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev
> 
> 
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-- 
Damian Ivereigh
CEPS Team Lead
Desk: +61 2 8446 6344
Mob: +61 418 217 582

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