Switching between android phone's front and back cameras

I wanted to use both the camera开发者_开发知识库s simultaneously, but it is not supported as of now. The next approach was to switch the cameras as fast as possible. I found that a switching delay of 400 ms was visible, but a delay of 200 ms was not detected by the eyes.

I want to know what is the lowest switching time that can be reached.

If the frame rate is 30 fps ( 33.33 ms per frame) , then can it be safely said that the lowest switching time cannot be less than 33.33 ms?

Has anyone tried anything similar? Appreciate any pointers.

Thanks

Switching is very easy. All you need is to launch the camera application, hit the switch gear icon and you are done. I stumbled it here