I've made a mistake. I was accessing AVPlayer.status instead of AVPlayerItem.status. Now the status and error avaialable. I'm getting following error: Error Domain=AVFoundationErrorDomain Code=-11821 "Cannot Decode" UserInfo={NSLocalizedFailureReason=The media data could not be decoded. It may be damaged., NSLocalizedDescription=Cannot Decode, NSUnderlyingError=0x281dc83f0 {Error Domain=NSOSStatusErrorDomain Code=-12911 "(null)"}} But still would be great to have a confirmation that this is because f the size/quality of video.

Thank you for the explanation.

Thanks for the reply. An application will receive nil if it fails to meet any of the above 4 requirements. But that's not true, in my case. The completion handler is not called. I just happen randomly and I can't found the cause of this. even when I use old function CNCopyCurrentNetworkInfo then this method is not finished (i did wait about 30 sec). This is callstack. #0 0x00000001ba7fc2d0 in mach_msg_trap () #1 0x00000001ba7fb6d8 in mach_msg () #2 0x00000001077b4560 in _dispatch_mach_send_and_wait_for_reply () #3 0x00000001077b48fc in dispatch_mach_send_with_result_and_wait_for_reply () #4 0x00000001d82a0e68 in xpc_connection_send_message_with_reply_sync () #5 0x000000019e8a7984 in NEHelperCopyResponseAndCancel () #6 0x000000019e8a9f68 in NEHelperCopyCurrentNetworkInfo () #7 0x00000001c579ddf4 in __CNCopyCurrentNetworkInfo () #8 0x0000000104fa15c0 in @nonobjc CNCopyCurrentNetworkInfo(_:) ()