Fix Whisper transcription for stereo audio by converting to mono

RunWhisper.cs

@@ -103,8 +103,26 @@ public class RunWhisper : MonoBehaviour
     {
         numSamples = audioClip.samples;
         var data = new float[maxSamples];
+
+        // Handle stereo to mono conversion
+        if (audioClip.channels == 2)
+        {
+            var stereoData = new float[numSamples * 2];
+            audioClip.GetData(stereoData, 0);
+
+            int monoSamples = Mathf.Min(numSamples, maxSamples);
+            for (int i = 0; i < monoSamples; i++)
+            {
+                data[i] = (stereoData[i * 2] + stereoData[i * 2 + 1]) / 2f;
+            }
+        }
+        else
+        {
+            numSamples = Mathf.Min(numSamples, maxSamples);
+            audioClip.GetData(data, 0);
+        }
+
         numSamples = maxSamples;
-        audioClip.GetData(data, 0);
         audioInput = new Tensor<float>(new TensorShape(1, numSamples), data);
     }