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

[Juri Haberland <juri@koschikode.com>]

Michal Dobrzynski wrote:
> On 23/04/2004, at 8:07 AM, Juri Haberland wrote:
>> Prakash K. Cheemplavam wrote:
>>> Michal Dobrzynski wrote:

>>>> 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.

> 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.

I'm not talking about a DVB-S ff card - I'm talking about a DVB-T ff
card here. Switching DVB-T channels is on average faster wit the old DVB
driver than with the new dvb-kernel driver. Did you try the old one?

Cheers,
Juri



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