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ds123
n00b
Joined: 22 Mar 2004
Posts: 66
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 Posted: Wed May 09, 2012 10:49 pm Post subject: Two webcams |
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I'm not sure if this is in the right section, so please point somewhere else if necessary.
I have started playing with opencv and I want to use two webcams for this. While one works just fine, I am able to use two only if the resolution is moved from 640x480 to 320x240.
The error that I get with a resolution at 640x480 is:
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libv4l2: error turning on stream: No space left on device.
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Now I don't quite know what this means, but I speculate that there is a buffer on USB that needs to be larger than it is.
here is lsusb:
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Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0ac8:3420 Z-Star Microelectronics Corp. Venus USB2.0 Camera
Bus 001 Device 004: ID 0ac8:3420 Z-Star Microelectronics Corp. Venus USB2.0 Camera
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I have seen a reference to perhaps needing a separate 2.0 usb bus for each camera.
So, on to the questions.
1. Is there a buffer associated with USB? How can I figure out how large mine is?
2. Can I get out of buying a new motherboard? Is there some usb add-on that would fix my problem?
3. Is there some kernel setting that will enable this to work?
4. If I do have to get a new motherboard, do you have any suggestions for one that will handle it?
Any and all answers greatly appreciated.
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k-root
Guru
Joined: 08 Jan 2005
Posts: 428
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ds123
n00b
Joined: 22 Mar 2004
Posts: 66
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| Posted: Thu May 10, 2012 3:30 am Post subject: |
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Well, it wasn't low tech a few years ago when I bought it...
I just googled e5300, it looks like it is in the 2.6ghz range, while my processor is a 2.4ghz, so not that much slower, but maybe that is it.
For every thing else I do, it seems snappy enough, but you might right about that. I was also hoping that I could run a similar setup on an old laptop (7 years at this point) for a robot, but I think that idea is dead now.
Thanks for your help, and if you think of any other way out of the dilemma, please let me know. |
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Kernel & Hardware
