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I also had exactly his problem, two webcams and a Raspberry Pi 3. I solved it eventually.

If I remember correctly, I was just ignoring this "no space left" error message.

    camL>>frameL;
    camR>>frameR;
    if (frameL.empty() || frameR.empty())
    {
        break; //instead of exit
    }

If it doesn't work, try to use the default camera settings (so comment the cap...set(...) lines). Or make a small pause between setting up the camera and capturing.

If it still doesn't help, I'll try to think of something other I did. As I said, I don't remember exactly how I solved it...