Re: frame-rate using 2 cams

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Stefan Kuthan wrote:

has anyone ever tried running 2 digital/web cams with linux?

Yes, using two ov511 cameras ( http://alpha.dyndns.org/ov511/ ). The driver has a "cams" parameter which reduces each camera's frame rate. This allows them to share a single USB bus.

i need a frame-grab rate of about 25 fps / cam, more would be fine  ;-)

For that, you will probably have to use two separate USB host controller cards. Note that most cards only have a single bus, so it will only provide 12 Mbps regardless of how many ports it has. Some cards (Belkin Quadrabus?) actually provide four separate busses.

You will also need a camera that supports compression. OV511-based cameras can do 30 fps @ 320x240 with compression. You may even be able to get two on a single bus, as long as nothing else is on the bus. I am testing a single OV511 at 320x240 at 6 Mbps as I type, and getting 30 fps.

CPiA cameras ( http://webcam.sourceforge.net/ ) also have compression, but I don't own one so I can't comment on the performance.

what sort of system would i need? (it's for a job, not for me)

My CPU (PIII 450 w/ 512K L1 cache) is 60% utilized, running the aforementioned test. Once I have MMX support implemented, this should drop quite a bit (assuming it works; I am not much of an assembly programmer ;-) ).

i am considering using firewire. but don't have any experience on that

anyway. is it possible to process 25 fps * 2 on a common machine, not
using overlay? (i will have to work with the pics)

What sort of processing?

--
Mark McClelland
mmcclell@xxxxxxxxxxx








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