AVPlayer blank video: playing sound but no video

Question

This question has the same problem, but the solutions didn't work.

The AVPlayer sometimes plays a blank video: there is sound but no video.

While blank videos were played, we printed the frame and status of the player. The frame was non-zero and was correctly set. The status was also readyToPlay. The play function is also invoked on the main thread.

In other words, the frame for the player layer is valid, and the player is also ready to play. Yet no video appears, even though sound does.

The issue seems to be a timing one. If we wait 5-10 seconds before playing the video, the video works fine each time.

This issue appears on iOS 10, not iOS 8 or 9.

This thread on the Apple forums suggests it might be a bug related to AVVideoCompositionCoreAnimationTool, which we also use.

Any solutions?

This happens more often on iPhone 7 devices than iPhone 5s devices.

Code:

fileprivate func playVideo(_ videoURL: String, prompt: String) {
    // Show <playerView>
    playerView.isHidden = false

    // Use new video in player
    playerItem = AVPlayerItem(url: URL(fileURLWithPath: videoURL))


    print("STATUS: \(player.status == AVPlayerStatus.readyToPlay). FRAME: \(playerLayer.frame). MAIN THREAD: \(Thread.isMainThread)")


    player.replaceCurrentItem(with: playerItem)

    // Start playing video
    player.seek(to: kCMTimeZero)
    player.actionAtItemEnd = .none
    player.play()
}

Answer 1

In case anyone encounters this issue, the problem seems related to an iOS bug. The problem doesn't occur on iOS 8/9 devices, only on new iOS 10 devices. Starting with iOS 10.2, the problem vanishes.

Unfortunately, still no programmatic solution for 10.0.x or 10.1.x.