It doesn't matter that you're only keeping 1 mp of the 5 mp frames, as the Pi will need to read all 5 mps per frame from the USB camera over the USB bus, select the desired 1 mp sub-frames, and then spew them back out to storage over the same USB bus.
RECORD MULTIPLE USB CAMERAS SIMULTANEOUSLY FOR 3D SERIAL
You're not going to be able to get anywhere near 25 fps out of a 5 mp USB camera because the USB bus carries all of the data that isn't handled by the GPU, which takes care of the on-Pi Camera Serial Interface (CSI) and HDMI/NTSC/PAL video/audio output. (The 2 cameras are for 3D reconstruction of the courtship display of bowerbirds). I'd also like to record from a single microphone at the same time. Before I go out and purchase 25 Pi's, or even one to test, I would like to know if anyone has tried two cameras and if so how well it works. I do not want to use two Pi's because two of them will actually use more power than my old system and I'm mainly building a new system so that the solar panels can keep up with the power drain. However I don't know enough about the hardware to know if a single Pi would handle two camera USB inputs at the same time.
My question to everyone is: Will the Raspberry Pi be able to handle video from 2 cameras at 25 frames per second each, and feed them into a USB 1T hard disk drive? I can do the programming and I've been told that the Pi will work with USB cameras, specifically the IDS XS MicroEye camera with 5megapixels (I would not save the entire frame, only a 1 megapixel part). I am a zoologist interested in making a system with two cameras and a microphone to record the behaviour of birds via motion detection triggering by inter-frame pixel changes (this replaces a 2009 era existing system).
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