InvalidCastException: Unable to cast object of type 'SignalReceiver' to type 'CinemachineBrain'

Unity Engine
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1

Our Android player is hitting an exception in the Timeline package code, and we need some help understanding why. We are using a Timeline, and eventually, sometimes, the exception is raised from CinemachineMixer.ProcessFrame when trying to cast the playerData argument:

        public override void ProcessFrame(Playable playable, FrameData info, object playerData)
        {
            base.ProcessFrame(playable, info, playerData);

            // Get the brain that this track controls.
            // Older versions of timeline sent the gameObject by mistake.
            GameObject go = playerData as GameObject;
            if (go == null)
                mBrain = (CinemachineBrain)playerData;

Unity 2020.3.16f1, Cinemachine 2.7.8

2

This looks to be a Timeline bug. Can you file a bug report with a repro project?

3

We don’t know how to repro it yet; we discovered the exception in a released player via our logging agregator. Any clues as to how it might happen might help a repro. I don’t follow the code that feeds the wrong object to this method, as it is quite complicated.