Added isDisposed checks to audio classes. Dont flush the OpusEncodeStream

src/Discord.Net.WebSocket/Audio/Streams/OpusEncodeStream.cs

@@ -54,7 +54,7 @@ namespace Discord.Audio
             }
         }
 
-        public override void Flush()
+        /*public override void Flush()
         {
             FlushAsync(CancellationToken.None).GetAwaiter().GetResult();
         }
@@ -68,7 +68,7 @@ namespace Discord.Audio
             catch (Exception) { } //Incomplete frame
             _partialFramePos = 0;
             await base.FlushAsync(cancellationToken).ConfigureAwait(false);
-        }
+        }*/
 
         protected override void Dispose(bool disposing)
         {

src/Discord.Net.WebSocket/Audio/Streams/RTPWriteStream.cs

@@ -11,6 +11,7 @@ namespace Discord.Audio
         private readonly byte[] _nonce, _secretKey;
         private int _samplesPerFrame;
         private uint _ssrc, _timestamp = 0;
+        private bool _isDisposed;
 
         protected readonly byte[] _buffer;
 
@@ -36,7 +37,11 @@ namespace Discord.Audio
 
         protected override void Dispose(bool disposing)
         {
-            Flush();
+            if (disposing && !_isDisposed)
+            {
+                _isDisposed = true;
+                Flush();
+            }
             base.Dispose(disposing);
         }