Re: [gentoo-user] BTTV Mini-HOWTO -- how do I use multiple inputs?

[Nick Rout <nick@rout.co.nz>]

On Sun, 27 Nov 2005 20:54:02 -0800
"Daevid Vincent" <daevid@daevid.com> wrote:

> Followed the howto here:
> http://www.faqs.org/docs/Linux-mini/BTTV.html
> (which by the way is 5 years old)
> 
> I have an old hauppauge bt878 card with 4 inputs on it.
> 
> I have the video1 working fine, but how do I enable the other inputs?
> They're all the same RCA kind.
> 
> I ran the MAKEDEV script, but it didn't seem to make all the video* and vbi*
> nodes other than the first one...
> 
> I manually created the rest using the HOWTO as an example:
> I don't know anything about nodes and all this stuff, so I guessed that the
> 'c' number is the same as the ones that were created, and the number next to
> that increments from the one created.
> 
> daevid bin # ll /dev/video*
> lr-xr-xr-x  1 root root 11 Nov 27 19:42 /dev/video -> /dev/video0
> lr-xr-xr-x  1 root root 10 Nov 27 19:46 /dev/video0 -> v4l/video0
> lr-xr-xr-x  1 root root 10 Nov 27 20:36 /dev/video1 -> v4l/video1
> lr-xr-xr-x  1 root root 10 Nov 27 20:36 /dev/video2 -> v4l/video2
> lr-xr-xr-x  1 root root 10 Nov 27 20:36 /dev/video3 -> v4l/video3
> daevid bin # ll /dev/vbi*
> lr-xr-xr-x  1 root root 9 Nov 27 19:42 /dev/vbi -> /dev/vbi0
> lr-xr-xr-x  1 root root 8 Nov 27 19:46 /dev/vbi0 -> v4l/vbi0
> lr-xr-xr-x  1 root root 8 Nov 27 20:37 /dev/vbi1 -> v4l/vbi1
> lr-xr-xr-x  1 root root 8 Nov 27 20:37 /dev/vbi2 -> v4l/vbi2
> lr-xr-xr-x  1 root root 8 Nov 27 20:37 /dev/vbi3 -> v4l/vbi3
> daevid bin # ll /dev/v4l/*
> crw-rw-rw-  1 root video 81, 224 Dec 31  1969 /dev/v4l/vbi0
> crw-rw-rw-  1 root video 81, 225 Nov 27 20:35 /dev/v4l/vbi1
> crw-rw-rw-  1 root video 81, 226 Nov 27 20:35 /dev/v4l/vbi2
> crw-rw-rw-  1 root video 81, 227 Nov 27 20:35 /dev/v4l/vbi3
> crw-rw-rw-  1 root video 81,   0 Dec 31  1969 /dev/v4l/video0
> crw-rw-rw-  1 root video 81,   1 Nov 27 20:35 /dev/v4l/video1
> crw-rw-rw-  1 root video 81,   2 Nov 27 20:35 /dev/v4l/video2
> crw-rw-rw-  1 root video 81,   3 Nov 27 20:35 /dev/v4l/video3
> 
> 
> If I try to take a picture:
> 
> /usr/bin/v4lctl -c /dev/video0 snap jpeg 320x240
> /home/dae51d/public_html/nokia_cam.jpg
> /usr/bin/v4lctl -c /dev/video1 snap jpeg 320x240
> /home/dae51d/public_html/ittybitty_cam.jpg
> 
> Then the first one works fine, but the second one is failing with:
> 
> v4l2: open /dev/video1: No such device
> v4l2: open /dev/video1: No such device
> v4l: open /dev/video1: No such device
> no grabber device available

yes, you probably have one bttv device with a number of inputs. you
need to switch inputs. they are usually called TV, Composite, S-Video
etc. If there is more than one composite they might be called
Composite-1, Composite-2 etc

On the other hand they may be audio inputs? 4 composite inputs is
rather excessive I would have thought.

By the way which package does v4lctl come in?


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