On Monday 21 February 2005 12:58, Oliver Neukum wrote: [...]A video stream over usb1.1 must be compressed due to bandwidth available. Decompression needs cpu.
Thats what I was afraid of, which makes using it for a motion detected burgular alarm source considerably less than practical since the machine must be able to do other things too. Darn. And its usb1.1 even when plugged into a 2.0 capable port.
Depending on the camera model you can try some bandwidth reduction measures to try to make it send uncompressed video:
- reduce frame rate. Something as low as 2 fps should be enough for motion detection.
- reduce requested resolution. This of course depends on whether you have enough resolution or not.
- selecting gray scale images. I don't know if your motion detection software is greatly affected by this, or not.
USB1.1 bandwidth is enought for 640x480, 8 bits gray scale (or color, 8 bits bayer pattern), at 3 fps.
Of course, you can always buy a USB2.0 camera :)
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