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Assets/AVProVideo/Extensions/Timeline/MediaPlayerControlMixerBehaviour.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
+{
+	public class MediaPlayerControlMixerBehaviour : PlayableBehaviour
+	{
+		public float audioVolume = 1f;
+		public string videoPath = null;
+
+		public override void ProcessFrame(Playable playable, FrameData info, object playerData)
+		{
+			MediaPlayer mediaPlayer = playerData as MediaPlayer;
+			float finalVolume = 0f;
+
+			if (!mediaPlayer)
+				return;
+
+			int inputCount = playable.GetInputCount(); //get the number of all clips on this track
+			for (int i = 0; i < inputCount; i++)
+			{
+				float inputWeight = playable.GetInputWeight(i);
+				ScriptPlayable<MediaPlayerControlBehaviour> inputPlayable = (ScriptPlayable<MediaPlayerControlBehaviour>)playable.GetInput(i);
+				MediaPlayerControlBehaviour input = inputPlayable.GetBehaviour();
+				
+				// Use the above variables to process each frame of this playable.
+				finalVolume += input.audioVolume * inputWeight;
+			}
+
+			if (mediaPlayer != null)
+			{
+				mediaPlayer.AudioVolume = finalVolume;
+				if (mediaPlayer.Control != null)
+				{
+					mediaPlayer.Control.SetVolume(finalVolume);
+				}
+			}
+		}
+	}
+}
+#endif