How do I pause video at the exact moment I capture a photo?

Question

I am using AVFoundation to display a Video in my UIView via an AVCaptureVideoPreviewOverlay. I then use AVStillImageOutput's -captureStillImageAsynchronouslyFromConnection: to capture a still Image from the Video with the AVCaptureSessionPresetPhoto preset.

I am freezing the video using AVCaptureSession's -stopRunning in the -captureStillImageAsynchronouslyFromConnection completion block mentioned earlier. However, it's too late and the video has continued running while the still image is taken, so the freeze is a second or two later. When I display the image there is a jump.

How can I freeze the video at the exact moment the photo is taken?

Answer 1

Almost a year later...Your approach is all wrong. Instead of trying to pause the video at the precise moment that the image is captured why don't you pause the video and then capture that paused image. To a user it makes no difference, to a developer you don't have to worry about exact precision.

To reiterate my idea, if you pause a video and flash white visual and play a click the user will think you have just captured that frame regardless if you are or not. Actually, you could consider pausing video the same as capturing an image without saving it.