[AVPlayerItem addOutput:] Cannot attach an output that is already attached or nil output

[AjayGol]

Describe the Bug
*** [AVPlayeritem addOutput:] Cannot attach an output that is already attached or nil output.

Steps To Reproduce
TBH it did not happen to me on debug, but it seems that is happening to my users in production. I have reports from Firebase Crashlytics.

OS: macOS 13.5.2
CPU: (8) arm64 Apple M1
react-native: ^0.68.0 => ^0.68.0
xCode: 15(15A240d)/usr/bin/xcodebuild

Using react-native-track-player@^4.0.1

This is happen on real devices, most of them iOS 16 and up.

[fivecar]

My users are getting this in production off v4.0.1 as well (with an example today on iOS 17.4 using iPhone 15 Pro). @jspizziri : in #1818, you mentioned that the particular issue would be better handled/supported if people got off the RC's... I think it's now been seen by many folks on 4.0.1, so it feels like a legitimate/continued issue.

I'm happy to help make a PR here, but I'm not positive what the actual fix should be. For instance, should we try to detect an already-attached or nil output, and simply not try to startObserving it? Or alternatively, does hitting this code path indicate a deeper problem that we need to fix upstream of this moment?

[9mzodiac]

This issue is also affecting my app, I hope it gets fixed soon