AVPlayer KVO crashes at replaceCurrentItem on iOS 16.1

Question

cplau OP

Created Nov ’22

Replies 4

Boosts 1

Views 2.1k

Participants 5

Call function replaceCurrentPlayerItem of AVPlayer while running in the background and then throw an exception.

It seems to be not limited to currentItem.hasEnabledAudio. We saw similar exceptions for these members:

currentItem.hasEnabledVideo
currentItem.liveUpdateInterval
currentItem.duration
currentItem.status
currentItem.seekableTimeRangesLastModifiedTime

Fatal Exception: NSInternalInconsistencyException Cannot remove an observer <NSKeyValueObservance 0x282f90900> for the key path "currentItem.liveUpdateInterval" from <AVPlayer 0x2823d2590>, most likely because the value for the key "currentItem" has changed without an appropriate KVO notification being sent. Check the KVO-compliance of the AVPlayer class. Expected behavior No crash

Boost

Answer 1

ChengzhiHuang OP

Nov ’22

You can use AVQueuePlayer instead of AVPlayer.

Before

AVPlayerViewController *vc = ###whatever###;
AVPlayer *player = vc.player;
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:path]];
if (player) {
    [player replaceCurrentItemWithPlayerItem:playerItem];
} else {
    player = [AVPlayer playerWithPlayerItem:playerItem];
}

After

AVPlayerViewController *vc = ###whatever###;
AVPlayer *player = vc.player;
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:path]];
if (player) {
    AVQueuePlayer *player = (AVQueuePlayer *)player;
    [player removeAllItems];
    [player insertItem:playerItem afterItem:nil];
} else {
    player = [AVQueuePlayer playerWithPlayerItem:playerItem];
}

see: https://github.com/SwiftOldDriver/iOS-Weekly/issues/3725

0

Answer 2

polo_marco OP

Nov ’22

Experiencing the same crash on my side.

But why so many crashes on AVPlayer with iOS 16? Firstly, crash on [AVPlayer _addLayer] and now this crash?

0

Answer 3

Media Engineer OP

Apple

Dec ’22

Please file a report with a reproducible case attached.

0

Answer 4

JackYoustra OP

Dec ’22

Set allowsVideoFrameAnalysis = false on the AVPlayerViewController using this.

0