2 cams on one computer?

[sjensen]

Anyone have 2 cams of the same model working together on the same computer? Now that I've got one cam up and streaming, I'm looking at adding another cam (or 3), to minimize the amount of computers I'm going to have to weather-proof (and provide power and netowrk and...) for camming up our zoo...

I'm using 2 of the Logitech Quickcam 4000 Pros, just one works fine, but when I add the second cam to the mix, things lock up and I get messages like

v4l demuxer error: failed capturing new frame

on the second camera, and the first camera just stops broadcasting.

Running Ubuntu 6.06, the saliard.org pwc driver, VLC passes a UDP stream off to Darwin Streaming Server, all on one box. Ideas, thoughts, comments, etc. are appreciated.

[Guest]

me too,
ubuntu 6.06
using 2 of the Logitech Quickcam either

errmsg
[00000275] v4l demuxer error: failed capturing new frame
[00000275] v4l demuxer error: failed capturing new frame
[00000275] v4l demuxer error: failed capturing new frame
....

[cheeseness]

I'm looking at doing this too.

Did you end up having any success?

At which point does it lock up?
If you try to launch VLC with two cams plugged in, or when you try to get VLC to talk to the second one?

[sjensen]

No success... problem happens when VLC tries to access second cam...

[raden]

maybe this is can help..

use commandline dmesg, to show the device that you used
all device detected linux in /dev, in my case I use two device tv card and detected by /dev/video0 and /dev/video1

[cheeseness]

Is there another way to specify which cam you're using?

I haven't gotten a second cam yet, but that was the process I used to identify which devide I wanted to stream from with my first one.

[als101]

You should connect cams to different USB host controllers, not just to different connectors.
There exists bitrate limitation PER CONTROLLER. If controlers are MB built-in -- inspect dmesg or lspci output for controlers list.
Another possible variant -- try USB2 addon card, especially with molex power connector. (Approved by the system at the table in front of me).