How to capture into file only last 30 secounds? Java JFM

Programmer Question

Hi Guys,
Maybee anyone have any idea how to capture into file only last 30 secounds from camera?

It's working something like this.
Camera working non stop, but when it catch action ( maybee from button )
I'm should ge only last 30 secounds of movie.
Please help.
Mik

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