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

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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