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I had seen thread(s) on this and to the best of my knowledge, nobody has been able to get 2 of the same type of video capture source to perform 2 capture screens successfully. I happened to stumble through a way to make this work on a very outdated laptop.  First, the laptop:

Windows XP Professional Service Pack 3 (build 2600)
Dell Inc. Inspiron 1520
2.20 gigahertz Intel Core2 Duo
64 kilobyte primary memory cache
4096 kilobyte secondary memory cache
64-bit ready
Multi-core (2 total)
Not hyper-threaded        
Bus Clock: 200 megahertz
BIOS: Dell Inc. A09 07/11/2008      
Drives:   
500.11 Gigabytes Usable Hard Drive Capacity
464.09 Gigabytes Hard Drive Free Space
3582 Megabytes Usable Installed Memory

Now, for what I did and most importantly, how I did it as the procedure seems to be important since there was no other sequence of plugging in and disconnecting that seems to work.

1) start Kinovea
2) plug in1 PS3eye camera to a USB port
3) from the "View" tab, select "Two capture screens"
4) on the left capture screen, under Select Source, choose  "PS3Eye camera" (the camera s view becomes active)
5) plug in the 2nd PS3Eye camera into another usb port
6) on the right capture screen, under Select Source, choose "PS3Eye camera" (the camera s view becomes active)

from this point, I was able to record simultaneously on both cameras.

I tried other ways of connecting and disconnecting the cameras but had no luck making it work.

I would be interested in knowing if such procedures would work with 2 identical camcorders as well.

I am an athletic coach that uses Kinovea with my students to enhance performance via video capture and review. (am using 8.15 w/ Win XP)  During a session with one of my students, I was making extensive use of the 2 capture screen capability to watch a movement via 2 angles being captured by 1) a camcorder with firewire connection and 2) a PS3Eye webcam utilizing USB. The student would perform 4 or 5 reps of the movement while watching himself on the capture screens. We would then stop and watch the recorded video. I noticed after about a half an hour of this that the live video capture was several seconds late with showing the movement on the screen. Also, when playing the later video back, it would change speeds (usually being too fast) when compared to real time. I have gone thru a few of the older posts on this subject and see others have had similar situations. My question is this:

what are the controlling factors in keeping the capture and subsequent playback as “fresh” (or real time) as possible?

Are there memory/space buffers that I can clear when I get into a session such as previously mentioned? If so, how would I do this? Also, I noticed that performance of both of the aforementioned recording devices was better when I had the camcorder as the first capture screen and the PS3Eye as the second capture screen.

Many thanks in advance for any feedback and many thanks to Joan for all the work done on a terrific product!

... the ability to begin recording each capture at the same time. (single start and stop for record of two screens)