From 4baddaab7fa7f724724134ac21ab0378db40200a Mon Sep 17 00:00:00 2001
From: Malte Rosenbjerg <rosenbjerg@users.noreply.github.com>
Date: Fri, 17 Oct 2025 21:51:11 +0200
Subject: [PATCH] Add test verifying cancellation before processing starts

---
 FFMpegCore.Test/VideoTest.cs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/FFMpegCore.Test/VideoTest.cs b/FFMpegCore.Test/VideoTest.cs
index 7946552..5921a6e 100644
--- a/FFMpegCore.Test/VideoTest.cs
+++ b/FFMpegCore.Test/VideoTest.cs
@@ -1043,6 +1043,28 @@ public class VideoTest
         Assert.ThrowsExactly<OperationCanceledException>(() => task.ProcessSynchronously());
     }
 
+    [TestMethod]
+    [Timeout(BaseTimeoutMilliseconds, CooperativeCancellation = true)]
+    public void Video_Cancel_CancellationToken_Before_Throws()
+    {
+        using var outputFile = new TemporaryFile("out.mp4");
+
+        var cts = new CancellationTokenSource();
+
+        cts.Cancel();
+        var task = FFMpegArguments
+            .FromFileInput("testsrc2=size=320x240[out0]; sine[out1]", false, args => args
+                .WithCustomArgument("-re")
+                .ForceFormat("lavfi"))
+            .OutputToFile(outputFile, false, opt => opt
+                .WithAudioCodec(AudioCodec.Aac)
+                .WithVideoCodec(VideoCodec.LibX264)
+                .WithSpeedPreset(Speed.VeryFast))
+            .CancellableThrough(cts.Token);
+
+        Assert.ThrowsExactly<OperationCanceledException>(() => task.ProcessSynchronously());
+    }
+
     [TestMethod]
     [Timeout(BaseTimeoutMilliseconds, CooperativeCancellation = true)]
     public async Task Video_Cancel_CancellationToken_Async_With_Timeout()