    &quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">stack</span><span class="o">.</span><span class="n">children_of_type</span><span class="p">([</span><span class="n">ItemType</span><span class="o">.</span><span class="n">IT_VIDEO_TRACK</span><span class="p">])</span>

    <span class="nd">@property</span>
    <span class="k">def</span><span class="w"> </span><span class="nf">history</span><span class="p">(</span><span clas