Open Radar

 
Area:
AVFoundation

Summary:

AVPlayerItem's duration value (CMTime) remains indefinite after status of the item becomes .readyToPlay. AVPlayerItem gets correct duration and sends a KVO notification just a moment after status of the item becomes .readyToPlay, but it's not yet available at the moment of status KVO observation.
Reproducible in 1-10% of the cases, and only when running on iOS 12. The issue is reproducible more often on a fast network (100mbps), or with a local file. Reproduces both on device and simulator.

Steps to Reproduce:

1. Initialize an AVPlayerItem with an asset (from the bundle or a remote file)
2. Create an AVPlayer instance with that item and automatically loaded duration key, add KVO observers for "duration" and "status"
3. Let the player be, so it makes itself ready to play.

Expected Results:

When KVO notification arrives for status becoming .readyToPlay, duration is always a valid CMTime value, as mentioned in documentation for AVPlayerItem.duration and in the comment for AVPlayerItem.duration in the header file.

Actual Results:

In some runs, when KVO notification arrives for status becoming .readyToPlay, duration is still indefinite. 

Version/Build:
Simulator: Version 10.0 (SimulatorApp-869.5 CoreSimulator-572.2), tested on iPhone 7 and iPhone XR simulators.
Device: iOS 12.0.1 (16A405), iPhone XS

Configuration:
Xcode Version 10.0 (10A255)