iphone - Save video of last 30 second -

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i want develop program in user can capture , save last 30 sec of video after stop button pressed.

1) have control on video recording?

2) how can last 30 sec of video?

if can manage images @ rate of 15/fps using uiimagepickercontroller.

then make buffer of size 15*30.

make queue nsmutablearray remove first frame new frame , add new frame @ end of queue.

at end when user press stop button. create video(using custom codac).

i not sure can helpful.


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