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Assets/AVProVideo/Extensions/Timeline/MediaPlayerControlTrack.cs

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+// You need to define AVPRO_PACKAGE_TIMELINE manually to use this script
+// We could set up the asmdef to reference the package, but the package doesn't 
+// existing in Unity 2017 etc, and it throws an error due to missing reference
+//#define AVPRO_PACKAGE_TIMELINE
+#if (UNITY_2018_1_OR_NEWER && AVPRO_PACKAGE_TIMELINE)
+using UnityEngine;
+using UnityEngine.Playables;
+using UnityEngine.Timeline;
+using System.Collections.Generic;
+
+//-----------------------------------------------------------------------------
+// Copyright 2020-2021 RenderHeads Ltd.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace RenderHeads.Media.AVProVideo.Playables
+{
+	[TrackClipType(typeof(MediaPlayerControlAsset))]
+	[TrackBindingType(typeof(MediaPlayer))]
+	public class MediaPlayerControlTrack : TrackAsset
+	{
+		public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount) 
+		{
+			// before building, update the binding field in the clips assets;
+			var director = go.GetComponent<PlayableDirector>();
+			var binding = director.GetGenericBinding(this);
+			
+			foreach (var c in GetClips())
+			{
+				var myAsset = c.asset as MediaPlayerControlAsset;
+				if (myAsset != null)
+				{
+					myAsset.binding = binding;
+				}
+			}
+
+			//return base.CreateTrackMixer(graph, go, inputCount);
+			return ScriptPlayable<MediaPlayerControlMixerBehaviour>.Create(graph, inputCount);
+		}
+	}
+}
+#endif