Re: saa7134 surveillance

[hermann pitton <hermann-pitton@xxxxxxxx>]

Hi,

Am Dienstag, den 02.06.2009, 01:31 +0200 schrieb S P:
> It has 4 chips only, and 2 D-SUB-like input, and it has four-four
> coax(for video) and eight-eight RCA(for sound) cable per input.
> If you wish, I could make a picture of it.
> 
> Regards, Peter Sarkozi

if it has only four chips, it can only support four inputs at once.

The idea having 8 cameras at once is realized only in software then,
by switching between at least two inputs per saa713x.

The card=0 only has one input per saa713x chip, so you should add the
second one for each. Have a look at saa7134-cards.c.

In short, it likely is only a software and not a driver problem.

Only if the TS/DVB input is used at once, the chips can handle two
inputs at the same time. Some (likely unsupported) hardware mpeg/TS
encoder there?

Cheers,
Hermann


> 
> 2009/6/2 hermann pitton <hermann-pitton@xxxxxxxx>:
> > Hi,
> >
> > Am Dienstag, den 02.06.2009, 00:53 +0200 schrieb S P:
> >> I have 2.6.28 version kernel(The default with ubuntu jaunty). But I
> >> had checked the documentation of 2.6.29 and saw that the v4l framework
> >> redesinged a bit...so I have to compile the 2.6.29 kernel to see all
> >> the cameras? Nice...but I will try.
> >> Anyway: Thanks for the reply!
> >>
> >> Regards, Peter Sarkozi
> >
> > that won't help.
> >
> > We had always support for at least eight saa713x chips.
> >
> > Do you have four such chips on the board or eight?
> >
> > Cheers,
> > Hermann
> >
> >
> >> 2009/6/1 Håkon Alstadheim <hakon@xxxxxxxxxxxxxxxxxx>:
> >> > S P wrote:
> >> >>
> >> >> Hi!
> >> >> I have a surveillance card with saa7134 chips. It should be able to
> >> >> see 8 cameras at a time, but there is only 4 video devices in /dev of
> >> >> this card.
> >> >> These devices are working fine, each device's channel 0(there isn't
> >> >> any other channel of these devices) is an input for a camera.
> >> >> So, how could I manage it to be 8 devices?
> >> >>
> >> >>
> >> >
> >> > Kernel-version ? Newer kernels allow you to set v4l subsystem to "allocate
> >> > minor device numbers dynamically". This is supposed to allow more than 4
> >> > devices on a single card, according to the help-text of the 2.6.29 kernel I
> >> > just compiled.
> >> >
> >> > Caveat: All this is from memory, ~24hours old.
> >> >
> >> > --
> >> > Håkon Alstadheim
> >> > 47 35 39 38
> >> >
> >> >
> >> >
> >> > --


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