diff --git a/web/opus-repro.html b/web/opus-repro.html
new file mode 100644
index 0000000..5f6ff10
--- /dev/null
+++ b/web/opus-repro.html
@@ -0,0 +1,35 @@
+<html>
+    <button onclick="go()">Go!</button>
+    <script>
+        function go() {
+            let audioContext = new AudioContext({sampleRate: 44100});
+
+            let oscillator = new OscillatorNode(audioContext);
+            let gain = new GainNode(audioContext, {gain: 1});
+            oscillator.connect(gain);
+            gain.connect(audioContext.destination);
+            for(let i = 0; i < 4; ++i ) {
+                gain.gain.setValueAtTime(1, i / 2);
+                gain.gain.setValueAtTime(0, i / 2 + 0.3);
+            }
+            oscillator.start();
+            oscillator.stop(2);
+
+            let audioStreamNode = audioContext.createMediaStreamDestination();
+            gain.connect(audioStreamNode);
+            let recorder = new MediaRecorder(audioStreamNode.stream, { mimeType: 'audio/ogg; codecs=opus' });
+
+            let chunks = [];
+            recorder.ondataavailable = e => chunks.push(e.data);
+            recorder.onstop = () => {
+                let blob = new Blob(chunks, {type: 'audio/ogg; codecs=opus'});
+                let url = URL.createObjectURL(blob);
+                let audio = new Audio(url);
+                audio.play();
+            };
+
+            recorder.start();
+            setTimeout(() => recorder.stop(), 2000);
+        }
+    </script>
+</html>
\ No newline at end of file
