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VideoWriter::get() always returns 0.0 #C++

Hello,

I'm working with OpenCV and I wanted to work with "videowriter::get()" and "videowriter::set()", but I don't know if it's posible. For example, while getting with "videowriter::get()" any property, the output always is cero. Is there any solution? Any other advice if I want to change dinamically the framerate of a video I'm recording?

Thank you.