[vdr] Cause for interferences ?

Klaus Schmidinger Klaus.Schmidinger at cadsoft.de
Sun Dec 11 14:03:28 CET 2005


Jukka Tastula wrote:
> On Sunday 11 December 2005 04:35, Niko Mikkila wrote:
> 
>>>Same here except if I change channel by pressing up or down -- then
>>>there is no black screen in between, just pixelation and sound seems
>>>to play some sample from the last channel for a couple of ms (which is
>>>really annoying if it happens to be something loud).
>>>
>>>Is there a real reason why it's different when typing in a channel
>>>number or is this another magical feature no one can explain?
>>
>>I'd guess that difference comes from changing the transponder (that
>>requires retuning with only one card) vs changing between channels in
>>the same mux.
> 
> 
> It's not that since if I change from yle 1 to yle 2 it's instant with 
> channel up but there's a pause if I do it by pressing 2. Exact same thing 
> between yle2 and mtv3,  pause if I press the channel number, absolutely no 
> pause if I press channel up. 
> 
> I have two dvb-t cards in the box and I've set up the ca so that it never 
> has to retune when switching between frequencies.
> 
> So, I'm guessing then that pressing the number key always causes a retune 
> but channel up/down only if it is necessary.

There is no difference in the way channels are switched.
The pause you are observing when entering a digit is the time
VDR waits for more digits (DIRECTCHANNELTIMEOUT in menu.c).

Since when entering a digit the channel display comes up,
maybe that's what disturbs the DXR3 device?

In order to test this you could try commenting out all

   displayChannel->Flush();

lines in menu.c.

Klaus



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