AVPlannedVideoSegmentWritingRequest
Declaration
class AVPlannedVideoSegmentWritingRequestOverview
AVPlannedVideoSegmentWritingRequest encompasses a request from the AVAssetWritingPlanner to the client code to write one incremental video track segment with compression.
The client should respond to this request by writing the specified time range of data to a movie file at the specified segmentFileOutputURL, with start PTS zero. The client’s writing work may be completed asynchronously. If it completes successfully, it must call the -finish method on the request object. If writing the segment fails, it must call the -finishWithError: method on the request object.