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    <p>This worked for me! I was missing code Gst::init(); in main()</p> <pre><code>#include &lt;gtkmm.h&gt; #include &lt;gstreamermm.h&gt; #include &lt;glibmm/main.h&gt; #include &lt;iostream&gt; class Sound { public: Sound(); void start_playing(double frequency); bool stop_playing(); private: Glib::RefPtr&lt;Gst::Pipeline&gt; m_pipeline; Glib::RefPtr&lt;Gst::Element&gt; m_source; Glib::RefPtr&lt;Gst::Element&gt; m_sink; }; Sound::Sound() { m_pipeline = Gst::Pipeline::create("note"); m_source = Gst::ElementFactory::create_element("audiotestsrc", "source"); m_sink = Gst::ElementFactory::create_element("autoaudiosink", "output"); m_pipeline-&gt;add(m_source); m_pipeline-&gt;add(m_sink); m_source-&gt;link(m_sink); } void Sound::start_playing (double frequency) { m_source-&gt;set_property("freq", frequency); //m_pipeline-&gt;set_state(Gst::STATE_NULL); //m_pipeline-&gt;set_state(Gst::STATE_PAUSED); //m_pipeline-&gt;set_state(Gst::STATE_READY); m_pipeline-&gt;set_state(Gst::STATE_PLAYING); /* stop it after 200ms */ Glib::signal_timeout().connect(sigc::mem_fun(*this, &amp;Sound::stop_playing), 200); } bool Sound::stop_playing() { //m_pipeline-&gt;set_state(Gst::STATE_PAUSED); m_pipeline-&gt;set_state(Gst::STATE_NULL); return false; } class HelloWorld : public Gtk::Window { public: HelloWorld(); virtual ~HelloWorld(); protected: //Signal handlers: void on_button_clicked(); //Member widgets: Gtk::Button m_button; Sound sound; }; HelloWorld::HelloWorld() : m_button("Hear Sound") // creates a new button with label "Hello World". { // Sets the border width of the window. set_border_width(10); // When the button receives the "clicked" signal, it will call the // on_button_clicked() method defined below. m_button.signal_clicked().connect(sigc::mem_fun(*this, &amp;HelloWorld::on_button_clicked)); // This packs the button into the Window (a container). add(m_button); // The final step is to display this newly created widget... m_button.show(); } HelloWorld::~HelloWorld() { } void HelloWorld::on_button_clicked() { std::cout &lt;&lt; "Hello World" &lt;&lt; std::endl; sound.start_playing(400); } int main(int argc, char* argv[]) { Gst::init(); Glib::RefPtr&lt;Gtk::Application&gt; app = Gtk::Application::create(argc, argv, "org.gtkmm.example"); HelloWorld helloworld; //Shows the window and returns when it is closed. return app-&gt;run(helloworld); return 0; } </code></pre>
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