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

Well I know that the FF v1.5 (detected as v1.3) card CAN switch faster as I've seen it do it. Tuning speed would only be limited by my DVB-T cards as far as I can understand.

Next question, I'm running Debian unstable and do not know if NPTL is enabled or not by default. I am running the latest 2.6 kernel though. All I know is that NPTL has something to do with threading.

Regards,
Michal

On 23/04/2004, at 8:07 AM, Juri Haberland wrote:

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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