Retrieves an image that is appropriate for display at the specified item time, and marks the image as acquired.
- iOS 6.0+
- macOS 10.8+
- Mac Catalyst 13.0+
- tvOS 9.0+
The time at which you want to retrieve the image from the item.
The time by which you intend to use the returned pixel buffer. You may specify
nilfor this parameter if you do not have a specific deadline.
A pixel buffer containing the image data to display or
nil if nothing should be displayed at the specified time. The caller is responsible for calling
CVBuffer on the returned data when it is no longer needed.
After calling this method, the video output object marks the pixel buffer data as having been acquired. This causes the
has method to return
false unless newer data becomes available.