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
cplau
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