p">(</span><span class="s2">&quot;Track&quot;</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">rate</span><span class="p">,</span> <span class="n">MediaType</span><span class="o">.</span><span class="n">MT_AUDIO</span><span class="p">))</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">stack</span><span class="o">.</span><span class="n">insert_child</span><span class="p">(</