<property name="left_attach">1</property>
                                <property name="right_attach">2</property>
                                <property name="top_attach">12</property>
                                <property name="bottom_attach">13</property>
                              </packing>
                            </child>
                            <child>
                              <object class="GtkEntry" id="config_play_audio_mpeg">
                                <property name="width_request">200</property>
                                <property name="height_request">20</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="invisible_char">●</property>
                                <property name="invisible_char_set">True</property>
                                <property name="primary_icon_activatable">False</property>

                                <property name="bottom_attach">2</property>
                              </packing>
                            </child>
                            <child>
                              <object class="GtkLabel" id="label7">
                                <property name="visible">True</property>
                                <property name="can_focus">False</property>
                                <property name="label"
                                translatable="yes">audio/mpeg</property>
                              </object>
                              <packing>
                                <property name="top_attach">1</property>
                                <property name="bottom_attach">2</property>
                              </packing>
                            </child>
                            <child>