error[E0282]: type annotations needed
  --> gstreamer-rtsp-server/src/r_t_s_p_media_factory.rs:15:152
   |
15 |         ffi::gst_rtsp_media_factory_add_role(self.to_glib_none().0, role.to_glib_none().0, T::static_type().to_glib() as *const _, v.to_glib_none().0, ptr::null_mut());
   |                                                                                                                                                        ^^^^^^^^^^^^^ cannot infer type for `T`

error: aborting due to previous error