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

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

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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