iPhone 使用 UIImagePickerController 从视频中捕获选择性帧
我想使用 UiImagePicker 录制视频，然后让用户使用 UiImagePicker 中内置的滚动视图浏览帧，并选择一些用户感兴趣的帧。
我知道我可以在 uiimagepicker 顶部覆盖一个控件来触发选择
我不确定的是我是否可以通过编程访问 UIImagePicker 显示的当前帧以便从中提取图像。
请告诉我这是否可行/可能。
还有其他省时/优雅的方法来实现上述目标吗？
我通过自己的视图创建了视频录制和帧选择（使用 AVCaptureSession、AVCaptureVideoDataOutput），但需要花费我相当多的时间来完善它，使其看起来像 UIImagePicker 一样，而且每个人都熟悉 iPhone 中的默认相机应用程序。
我希望我想要实现的目标是有意义的。
我知道可以通过截取屏幕截图来实现这一目标，但我只想用户单击一个按钮来捕获当前的显示帧。
谢谢
I wanted to use the UiImagePicker to record a video then let the user browse the frames using the scrollview built in the UiImagePicker and while at it, select a few frames that interest the user.
I know I can overlay a control on top of the uiimagepicker to trigger the selection
What I am not sure about is whether I have programatic access to the current frame shown by the UIImagePicker for me to extract an image out of it.
Please let me know if this is doable/possible.
Are there any other time efficient/elegant ways to achieving the above?
I had created by own view with video recording and frame selection (using AVCaptureSession, AVCaptureVideoDataOutput) but would take me quite a bit of time to polish it to make it look good like UIImagePicker plus everyone is familiar with the default camera app in the iPhone.
I hope it makes sense what I want to achieve.
I know one can kind of achieve the goal by taken a screenshot of the screen but I just want the user to click one button to capture the current show frame.
Thanks
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屏幕截图方法不适用于视频录制中的冻结帧。
使用基于自定义 AVFoundation 的帧捕获。
Screenshot method did not work for frozen frame from the video recording.
Went with a custom AVFoundation based frame capture.