Play .ogv file if .mp4 file missing on Windows

 - Required to fix video playback on Proton/Wine on ch1-8 (see #78)
 - Note: ch9 (rei) implements video playback differently, so these changes should not be applied to ch9

MOD.Scripts.Core.Movie/AVProMovieRenderer.cs

@@ -57,7 +57,7 @@ public void Init(MovieInfo movieInfo)
 			mediaPlayer.m_AutoOpen = true;
 			mediaPlayer.m_AutoStart = true;
 			mediaPlayer.m_Volume = movieInfo.Volume;
-			mediaPlayer.OpenVideoFromFile(MediaPlayer.FileLocation.AbsolutePathOrURL, movieInfo.Path + ".mp4");
+			mediaPlayer.OpenVideoFromFile(MediaPlayer.FileLocation.AbsolutePathOrURL, movieInfo.PathWithExt);
 			MODApplyToMaterial mODApplyToMaterial = base.gameObject.AddComponent<MODApplyToMaterial>();
 			mODApplyToMaterial._material = movieInfo.Layer.MODMaterial;
 			mODApplyToMaterial._texturePropertyName = "_Primary";

MOD.Scripts.Core.Movie/MovieInfo.cs

@@ -8,6 +8,13 @@ namespace MOD.Scripts.Core.Movie
 {
 	public class MovieInfo
 	{
+		public static string GetPathFromNameWithExt(string name, string ext)
+		{
+			return System.IO.Path.Combine(Application.streamingAssetsPath, "movies/" + name + ext);
+		}
+
+		private readonly string Ext;
+
 		public string Name
 		{
 			get;
@@ -16,13 +23,14 @@ public string Name
 
 		public float Volume => Math.Min(1f, 1.55f * GameSystem.Instance.AudioController.BGMVolume);
 
-		public string Path => "file:///" + System.IO.Path.Combine(Application.streamingAssetsPath, "movies/" + Name);
+		public string PathWithExt => "file:///" + GetPathFromNameWithExt(Name, Ext);
 
 		public Layer Layer => GameSystem.Instance.SceneController.MODActiveScene.BackgroundLayer;
 
-		public MovieInfo(string name)
+		public MovieInfo(string name, string ext)
 		{
 			Name = name;
+			Ext = ext;
 		}
 	}
 }

MOD.Scripts.Core.Movie/TextureMovieRenderer.cs

@@ -80,7 +80,7 @@ public TextureMovieRenderer()
 		public void Init(MovieInfo movieInfo)
 		{
 			this.movieInfo = movieInfo;
-			www = new WWW(movieInfo.Path + ".ogv");
+			www = new WWW(movieInfo.PathWithExt);
 			audioSource = base.gameObject.AddComponent<AudioSource>();
 			audioSource.volume = this.movieInfo.Volume;
 			base.enabled = true;

MOD.Scripts.Core.State/StateMovie.cs

@@ -1,12 +1,17 @@
 using Assets.Scripts.Core;
 using Assets.Scripts.Core.State;
 using MOD.Scripts.Core.Movie;
+using MOD.Scripts.UI;
+using System.IO;
 using UnityEngine;
 
 namespace MOD.Scripts.Core.State
 {
 	public class StateMovie : IGameState
 	{
+		const string windowsMovieExtension = ".mp4";
+		const string linuxMovieExtension = ".ogv";
+
 		private bool isLeaving;
 
 		private IMovieRenderer MovieEntity;
@@ -17,10 +22,39 @@ public class StateMovie : IGameState
 
 		public StateMovie(string moviename)
 		{
-			movieInfo = new MovieInfo(moviename);
+			// Windows and Wine/Proton will both show up as WindowsPlayer
+			bool isWindowsOrWine = Application.platform == RuntimePlatform.WindowsPlayer;
+
+			// Only play the .mp4 file with AVProVideo on Windows-like Platforms, if the file exists
+			// On Wine, it is expected that only the Linux .ogv video file is installed, as playing using AVProVideo/.mp4 files on Wine is not supported
+			bool windowsPlaybackMode = isWindowsOrWine && File.Exists(MovieInfo.GetPathFromNameWithExt(moviename, windowsMovieExtension));
+
+			// The below just shows a message if no video file found to play (it does not affect playback behavior)
+			if (!windowsPlaybackMode && !File.Exists(MovieInfo.GetPathFromNameWithExt(moviename, linuxMovieExtension)))
+			{
+				string movieFiles = $"{moviename}{linuxMovieExtension}";
+				if(isWindowsOrWine)
+				{
+					movieFiles = $"{moviename}{windowsMovieExtension} or " + movieFiles;
+				}
+
+				string errorMessage = $"ERROR: Movie file {movieFiles} not found";
+				Debug.Log(errorMessage);
+				MODToaster.Show(errorMessage, toastDuration:10);
+			}
+
+			movieInfo = new MovieInfo(moviename, windowsPlaybackMode ? windowsMovieExtension : linuxMovieExtension);
 			gameObject = new GameObject();
 			SetupBackgroundLayerForVideo();
-			MovieEntity = CreateMovieRenderer();
+
+			if(windowsPlaybackMode)
+			{
+				MovieEntity = gameObject.AddComponent<AVProMovieRenderer>();
+			}
+			else
+			{
+				MovieEntity = gameObject.AddComponent<TextureMovieRenderer>();
+			}
 			MovieEntity.Init(movieInfo);
 		}
 
@@ -76,15 +110,6 @@ public void Leave()
 			}
 		}
 
-		private IMovieRenderer CreateMovieRenderer()
-		{
-			if (Application.platform == RuntimePlatform.WindowsPlayer)
-			{
-				return gameObject.AddComponent<AVProMovieRenderer>();
-			}
-			return gameObject.AddComponent<TextureMovieRenderer>();
-		}
-
 		private void SetupBackgroundLayerForVideo()
 		{
 			movieInfo.Layer.ReleaseTextures();