Merge 67808c2e4a into 25d7ae8374

Fixed race condition on Named pipe dispose/disconnect

FFMpegCore/FFMpeg/Arguments/PipeArgument.cs

@@ -31,9 +31,13 @@ namespace FFMpegCore.Arguments
         public void Post()
         {
             Debug.WriteLine($"Disposing NamedPipeServerStream on {GetType().Name}");
+            lock(Pipe)
+            {
+
                 Pipe?.Dispose();
                 Pipe = null!;
             }
+        }
 
         public async Task During(CancellationToken cancellationToken = default)
         {
@@ -48,12 +52,18 @@ namespace FFMpegCore.Arguments
             finally
             {
                 Debug.WriteLine($"Disconnecting NamedPipeServerStream on {GetType().Name}");
+                lock (Pipe ?? new object()) 
+                    //if Pipe is null, then the lock doesnt matter,
+                    //Because the next code will not execute anyways.
+                    //so we can use a new object
+                {
                     if (Pipe is { IsConnected: true })
                     {
                         Pipe.Disconnect();
                     }
                 }
             }
+        }
 
         protected abstract Task ProcessDataAsync(CancellationToken token);
         public abstract string Text { get; }