I've been having this problem and I haven't been able to solve it for days now. It should be very simple, but I'm also very much a novice.
My webcam is flipped upside down. Tried flipping it back with v4l2, but the settings doesn't apply. In Cheese I can manually flip the webcam but the effect doesn't generalize to other applications, such as firefox/chrome or skype.
I know that internal ASUS cameras are physically installed upside-down and that there is software to flip it, but it seems v4l isn't able to do it.
The common solution for skype, LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l1compat.so /usr/bin/skype
doesn't fix the problem either.
Except actually turning my computer upside down, what options do I have?