diff --git a/FFMpegCore.Test/VideoTest.cs b/FFMpegCore.Test/VideoTest.cs
index 644476f..9285433 100644
--- a/FFMpegCore.Test/VideoTest.cs
+++ b/FFMpegCore.Test/VideoTest.cs
@@ -643,7 +643,7 @@ public async Task Video_Cancel_Async()
         {
             await using var resStream = new MemoryStream();
             var reader = new StreamPipeDataReader(resStream);
-            var writer = new RawVideoPipeDataWriter(BitmapSource.CreateBitmaps(256, System.Drawing.Imaging.PixelFormat.Format24bppRgb, 128, 128));
+            var writer = new RawVideoPipeDataWriter(BitmapSource.CreateBitmaps(512, System.Drawing.Imaging.PixelFormat.Format24bppRgb, 128, 128));
 
             var task = FFMpegArguments
                 .FromPipe(writer)
@@ -653,7 +653,7 @@ public async Task Video_Cancel_Async()
                 .CancellableThrough(out var cancel)
                 .ProcessAsynchronously(false);
 
-            await Task.Delay(100);
+            await Task.Delay(300);
             cancel();
             
             var result = await task;
diff --git a/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs b/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
index c6f74ac..bdd6ea5 100644
--- a/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
+++ b/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
@@ -26,7 +26,7 @@ internal FFMpegArgumentProcessor(FFMpegArguments ffMpegArguments)
 
         public string Arguments => _ffMpegArguments.Text;
 
-        private event EventHandler _cancelEvent; 
+        private event EventHandler CancelEvent = null!; 
 
         public FFMpegArgumentProcessor NotifyOnProgress(Action<double> onPercentageProgress, TimeSpan totalTimeSpan)
         {
@@ -41,7 +41,7 @@ public FFMpegArgumentProcessor NotifyOnProgress(Action<TimeSpan> onTimeProgress)
         }
         public FFMpegArgumentProcessor CancellableThrough(out Action cancel)
         {
-            cancel = () => _cancelEvent?.Invoke(this, EventArgs.Empty);
+            cancel = () => CancelEvent?.Invoke(this, EventArgs.Empty);
             return this;
         }
         public bool ProcessSynchronously(bool throwOnError = true)
@@ -53,7 +53,7 @@ void OnCancelEvent(object sender, EventArgs args)
                 instance?.SendInput("q");
                 cancellationTokenSource.Cancel();
             }
-            _cancelEvent += OnCancelEvent;
+            CancelEvent += OnCancelEvent;
             
             _ffMpegArguments.Pre();
             try
@@ -70,7 +70,7 @@ void OnCancelEvent(object sender, EventArgs args)
             }
             finally
             {
-                _cancelEvent -= OnCancelEvent;
+                CancelEvent -= OnCancelEvent;
                 _ffMpegArguments.Post();
             }
             
@@ -92,7 +92,7 @@ void OnCancelEvent(object sender, EventArgs args)
                 instance?.SendInput("q");
                 cancellationTokenSource.Cancel();
             }
-            _cancelEvent += OnCancelEvent;
+            CancelEvent += OnCancelEvent;
             
             _ffMpegArguments.Pre();
             try
@@ -109,7 +109,7 @@ await Task.WhenAll(instance.FinishedRunning().ContinueWith(t =>
             }
             finally
             {
-                _cancelEvent -= OnCancelEvent;
+                CancelEvent -= OnCancelEvent;
                 _ffMpegArguments.Post();
             }