fix some scenarios where video pointers should not be replaced

src/Video/VideoAV1Stream.cs

@@ -17,7 +17,7 @@ namespace MoonWorks.Video
 		public uint yStride;
 		public uint uvStride;
 
-		public bool FrameDataUpdated { get; private set; }
+		public bool FrameDataUpdated { get; set; }
 
 		bool IsDisposed;
 
@@ -43,22 +43,33 @@ namespace MoonWorks.Video
 		public void ReadNextFrame()
 		{
 			lock (this)
+			{
+				if (!Ended)
 				{
 					if (Dav1dfile.df_readvideo(
 						Handle,
 						1,
-					out yDataHandle,
+						out var yDataHandle,
-					out uDataHandle,
+						out var uDataHandle,
-					out vDataHandle,
+						out var vDataHandle,
-					out yDataLength,
+						out var yDataLength,
-					out uvDataLength,
+						out var uvDataLength,
-					out yStride,
+						out var yStride,
-					out uvStride) == 1
+						out var uvStride) == 1
 					) {
+						this.yDataHandle = yDataHandle;
+						this.uDataHandle = uDataHandle;
+						this.vDataHandle = vDataHandle;
+						this.yDataLength = yDataLength;
+						this.uvDataLength = uvDataLength;
+						this.yStride = yStride;
+						this.uvStride = uvStride;
+
 						FrameDataUpdated = true;
 					}
 				}
 			}
+		}
 
 		protected virtual void Dispose(bool disposing)
 		{

src/Video/VideoPlayer.cs

@@ -170,6 +170,7 @@ namespace MoonWorks.Video
 				if (CurrentStream.FrameDataUpdated)
 				{
 					UpdateRenderTexture();
+					CurrentStream.FrameDataUpdated = false;
 				}
 
 				currentFrame = thisFrame;