[linux-dvb] Re: Channel change delay with DVB-T

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Michal Dobrzynski wrote:
> 
> I am running VDR 1.3.6 with "Update Channels" set to "no" (if that
> makes a difference).
> 
> Regards,
> Michal

Well, then I guess it must be a driver issue.

Klaus

> On 23/04/2004, at 5:07 PM, Klaus Schmidinger wrote:
> 
> > Michal Dobrzynski wrote:
> >>
> >> Frankly I'd be overjoyed if I only had to wait 3 seconds at channel
> >> change :/ I timed it with a stopwatch and it takes at LEAST 5 seconds
> >> and sometimes even 8 seconds.
> >>
> >> I'm sure it wasn't always this slow :/ (ie when I first started
> >> dabbling). And it sure as hell was never this slow under Windows back
> >> when I tried it.
> >
> > Which version of VDR (if any) are you using?
> > If it is 1.2.x, have you applied the "autopid" patch?
> > That one is known to slow down channel switching.
> > Can you try VDR 1.3.6?
> >
> > Klaus
> >
> >> On 23/04/2004, at 4:38 PM, Adrian P Challinor wrote:
> >>
> >>> I understand the concerns here, but this delay also happens on
> >>> commercial
> >>> TV's. I have a fairly expensive Phillips TV with built in DVB-T
> >>> receiver,
> >>> and it takes at least three seconds to switch between digital
> >>> channels.
> >>> Analogue is instant.
> >>>
> >>> Is this something to do with DVB-T encoding?
> >>>
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: linux-dvb-bounce@linuxtv.org
> >>>> [mailto:linux-dvb-bounce@linuxtv.org]
> >>>> On Behalf Of Juri Haberland
> >>>> Sent: Thursday, April 22, 2004 11:08 PM
> >>>> To: linux-dvb@linuxtv.org
> >>>> Subject: [linux-dvb] Re: Channel change delay with DVB-T
> >>>>
> >>>> Prakash K. Cheemplavam wrote:
> >>>>> Michal Dobrzynski wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> I asked this on the VDR mailing list and was redirected here.
> >>>>>>
> >>>>>> Is there any way to reduce the massive channel change delays? I am
> >>>>>> running 2 DVB-T budget cards and one Full Featured DVB-S card for
> >>>> output
> >>>>>> and channel change times are quite disconcerting.
> >>>>>>
> >>>>>> Every time my parents change the channel they have to ask what's
> >>>>>> wrong as the screen stays black for 4 or 5 seconds (last night it
> >>>>>> even took 7 seconds a few times).
> >>>>>
> >>>>> Are you experiencing this with vdr or apps in general? I once had
> >>>>> the problem with vdr, when I compiled a 1.2.x version on a NPTL
> >>>>> enabled system. Using a NPTL disabled system, vdr tuned very fast.
> >>>>> I
> >>>>> haven't treid vdr 1.3.x with NPTL, though.
> >>>>
> >>>> I have such delays also with a DVB-T 1.3 premium card. Switching to
> >>>> channels on the same frequency as the previous channel is in general
> >>>> very fast, but switching to another frequency can take up to several
> >>>> seconds until you get a stable picture.
> >>>>
> >>>> This is without NTPL, with Linux kernel 2.4.25, dvb-kernel from
> >>>> 2004-04-13 and VDR 1.2.6 - so nothing fancy. With DVB driver from
> >>>> the
> >>>> DVB branch (aka the old driver) switching was a bit slower but
> >>>> reliable.
> >>>>
> >>>> Cheers,
> >>>> Juri


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