Changing Session present while shooting video using AVCaptureSession

While shooting video, I have to change the “sessionPreset” and I am able to change it also. But when I change sessionPresent , only latest changed video get stored.

Ex : Suppose I have been shooting video from last 40 seconds. I have changes sessionPresent from High to Low and I continued shooting video for next 10 seconds and stopped shooting video. Here, I am getting only last 10 seconds updated video.

 

Can I get total 50 seconds video ?

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