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<h1>Frequently Asked Questions</h1>
<h2 id="demo-does-not-work-when-deploying-to-the-cloud">Demo does not work when deploying to the cloud</h2>
<p>Make sure you are using a TURN server. See <a href="../deployment">deployment</a>.</p>
<h2 id="recorded-input-audio-sounds-muffled-during-output-audio-playback">Recorded input audio sounds muffled during output audio playback</h2>
<p>By default, the microphone is <a href="https://github.com/freddyaboulton/gradio-webrtc/blob/903f1f70bd586f638ad3b5a3940c7a8ec70ad1f5/backend/gradio_webrtc/webrtc.py#L575">configured</a> to do echo cancellation.
This is what's causing the recorded audio to sound muffled when the streamed audio starts playing.
You can disable this via the <code>track_constraints</code> (see <a href="../advanced-configuration">Advanced Configuration</a>) with the following code:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="n">stream</span> <span class="o">=</span> <span class="n">Stream</span><span class="p">(</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="n">track_constraints</span><span class="o">=</span><span class="p">{</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> <span class="s2">&quot;echoCancellation&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> <span class="s2">&quot;noiseSuppression&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;exact&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">},</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> <span class="s2">&quot;autoGainControl&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;exact&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">},</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> <span class="s2">&quot;sampleRate&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;ideal&quot;</span><span class="p">:</span> <span class="mi">24000</span><span class="p">},</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="s2">&quot;sampleSize&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;ideal&quot;</span><span class="p">:</span> <span class="mi">16</span><span class="p">},</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="s2">&quot;channelCount&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;exact&quot;</span><span class="p">:</span> <span class="mi">1</span><span class="p">},</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="p">},</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> <span class="n">rtc_configuration</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> <span class="n">mode</span><span class="o">=</span><span class="s2">&quot;send-receive&quot;</span><span class="p">,</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="n">modality</span><span class="o">=</span><span class="s2">&quot;audio&quot;</span><span class="p">,</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="p">)</span>
</span></code></pre></div>
<h2 id="how-to-raise-errors-in-the-ui">How to raise errors in the UI</h2>
<p>You can raise <code>WebRTCError</code> in order for an error message to show up in the user's screen. This is similar to how <code>gr.Error</code> works.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>The <code>WebRTCError</code> class is only supported in the <code>WebRTC</code> component.</p>
</div>
<p>Here is a simple example:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="k">def</span><span class="w"> </span><span class="nf">generation</span><span class="p">(</span><span class="n">num_steps</span><span class="p">):</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">num_steps</span><span class="p">):</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a> <span class="n">segment</span> <span class="o">=</span> <span class="n">AudioSegment</span><span class="o">.</span><span class="n">from_file</span><span class="p">(</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="s2">&quot;/Users/freddy/sources/gradio/demo/audio_debugger/cantina.wav&quot;</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="p">)</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a> <span class="k">yield</span> <span class="p">(</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a> <span class="n">segment</span><span class="o">.</span><span class="n">frame_rate</span><span class="p">,</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">segment</span><span class="o">.</span><span class="n">get_array_of_samples</span><span class="p">())</span><span class="o">.</span><span class="n">reshape</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">),</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a> <span class="p">)</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a> <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">3.5</span><span class="p">)</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a> <span class="k">raise</span> <span class="n">WebRTCError</span><span class="p">(</span><span class="s2">&quot;This is a test error&quot;</span><span class="p">)</span>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="k">with</span> <span class="n">gr</span><span class="o">.</span><span class="n">Blocks</span><span class="p">()</span> <span class="k">as</span> <span class="n">demo</span><span class="p">:</span>
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a> <span class="n">audio</span> <span class="o">=</span> <span class="n">WebRTC</span><span class="p">(</span>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;Stream&quot;</span><span class="p">,</span>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a> <span class="n">mode</span><span class="o">=</span><span class="s2">&quot;receive&quot;</span><span class="p">,</span>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a> <span class="n">modality</span><span class="o">=</span><span class="s2">&quot;audio&quot;</span><span class="p">,</span>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a> <span class="p">)</span>
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a> <span class="n">num_steps</span> <span class="o">=</span> <span class="n">gr</span><span class="o">.</span><span class="n">Slider</span><span class="p">(</span>
</span><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a> <span class="n">label</span><span class="o">=</span><span class="s2">&quot;Number of Steps&quot;</span><span class="p">,</span>
</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a> <span class="n">minimum</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span>
</span><span id="__span-1-22"><a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a> <span class="n">maximum</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span>
</span><span id="__span-1-23"><a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a> <span class="n">step</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span>
</span><span id="__span-1-24"><a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a> <span class="n">value</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span>
</span><span id="__span-1-25"><a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a> <span class="p">)</span>
</span><span id="__span-1-26"><a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a> <span class="n">button</span> <span class="o">=</span> <span class="n">gr</span><span class="o">.</span><span class="n">Button</span><span class="p">(</span><span class="s2">&quot;Generate&quot;</span><span class="p">)</span>
</span><span id="__span-1-27"><a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a>
</span><span id="__span-1-28"><a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a> <span class="n">audio</span><span class="o">.</span><span class="n">stream</span><span class="p">(</span>
</span><span id="__span-1-29"><a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a> <span class="n">fn</span><span class="o">=</span><span class="n">generation</span><span class="p">,</span> <span class="n">inputs</span><span class="o">=</span><span class="p">[</span><span class="n">num_steps</span><span class="p">],</span> <span class="n">outputs</span><span class="o">=</span><span class="p">[</span><span class="n">audio</span><span class="p">],</span> <span class="n">trigger</span><span class="o">=</span><span class="n">button</span><span class="o">.</span><span class="n">click</span>
</span><span id="__span-1-30"><a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a> <span class="p">)</span>
</span><span id="__span-1-31"><a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a>
</span><span id="__span-1-32"><a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a><span class="n">demo</span><span class="o">.</span><span class="n">launch</span><span class="p">()</span>
</span></code></pre></div>
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