* @param name A unique identifier for this renderer
* @param winid The parent widget identifier (required for SDL display). Set to 0 for OpenGL rendering
* @param profile The MLT profile used for the renderer (default one will be used if empty). */
* @param name A unique identifier for this renderer
* @param winid The parent widget identifier (required for SDL display). Set to 0 for OpenGL rendering
* @param profile The MLT profile used for the renderer (default one will be used if empty). */