From f5ecbaee68876131f7783a06f5755607128900b4 Mon Sep 17 00:00:00 2001
From: Sergey Nechaev <6499856+snechaev@users.noreply.github.com>
Date: Tue, 21 Oct 2025 17:29:27 +0200
Subject: [PATCH] Fixed a race condition that occurred when handling the
 cancellation of an asynchronous operation after the FFmpeg process had
 already exited. Fixes #348. Related: #592

---
 FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs b/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
index 2f350ce..8191223 100644
--- a/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
+++ b/FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
@@ -166,12 +166,28 @@ public class FFMpegArgumentProcessor
 
         void OnCancelEvent(object sender, int timeout)
         {
-            instance.SendInput("q");
+            ExecuteIgnoringFinishedProcessExceptions(() => instance.SendInput("q"));
 
             if (!cancellationTokenSource.Token.WaitHandle.WaitOne(timeout, true))
             {
                 cancellationTokenSource.Cancel();
-                instance.Kill();
+                ExecuteIgnoringFinishedProcessExceptions(() => instance.Kill());
+            }
+
+            static void ExecuteIgnoringFinishedProcessExceptions(Action action)
+            {
+                try
+                {
+                    action();
+                }
+                catch (Instances.Exceptions.InstanceProcessAlreadyExitedException)
+                {
+                    //ignore
+                }
+                catch (ObjectDisposedException)
+                {
+                    //ignore
+                }
             }
         }