diff --git a/FFMediaToolkit/Decoding/AudioStream.cs b/FFMediaToolkit/Decoding/AudioStream.cs
index 3562019..333b75a 100644
--- a/FFMediaToolkit/Decoding/AudioStream.cs
+++ b/FFMediaToolkit/Decoding/AudioStream.cs
@@ -13,6 +13,7 @@
     public unsafe class AudioStream : MediaStream
     {
         private SwrContext* swrContext;
+        private bool isDisposed;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="AudioStream"/> class.
@@ -132,9 +133,14 @@ public bool TryGetFrame(TimeSpan time, out AudioData data)
         /// <inheritdoc/>
         public override void Dispose()
         {
-            fixed (SwrContext** ptr = &swrContext)
+            if (!isDisposed)
             {
-                ffmpeg.swr_free(ptr);
+                fixed (SwrContext** ptr = &swrContext)
+                {
+                    ffmpeg.swr_free(ptr);
+                }
+
+                isDisposed = true;
             }
 
             base.Dispose();
diff --git a/FFMediaToolkit/Decoding/MediaStream.cs b/FFMediaToolkit/Decoding/MediaStream.cs
index bcb3e67..45c3c79 100644
--- a/FFMediaToolkit/Decoding/MediaStream.cs
+++ b/FFMediaToolkit/Decoding/MediaStream.cs
@@ -10,6 +10,8 @@
     /// </summary>
     public class MediaStream : IDisposable
     {
+        private bool isDisposed;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="MediaStream"/> class.
         /// </summary>
@@ -56,8 +58,12 @@ internal MediaStream(Decoder stream, MediaOptions options)
         /// <inheritdoc/>
         public virtual void Dispose()
         {
-            Stream.DiscardBufferedData();
-            Stream.Dispose();
+            if (!isDisposed)
+            {
+                Stream.DiscardBufferedData();
+                Stream.Dispose();
+                isDisposed = true;
+            }
         }
 
         /// <summary>
diff --git a/FFMediaToolkit/Decoding/VideoStream.cs b/FFMediaToolkit/Decoding/VideoStream.cs
index 619bff5..f59394c 100644
--- a/FFMediaToolkit/Decoding/VideoStream.cs
+++ b/FFMediaToolkit/Decoding/VideoStream.cs
@@ -16,6 +16,7 @@ public class VideoStream : MediaStream
         private readonly int outputFrameStride;
         private readonly int requiredBufferSize;
         private readonly ImageConverter converter;
+        private bool isDisposed;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="VideoStream"/> class.
@@ -232,7 +233,12 @@ public unsafe bool TryGetFrame(TimeSpan time, IntPtr buffer, int bufferStride)
         /// <inheritdoc/>
         public override void Dispose()
         {
-            converter.Dispose();
+            if (!isDisposed)
+            {
+                converter.Dispose();
+                isDisposed = true;
+            }
+
             base.Dispose();
         }