* \param p_instance the instance
* \param psz_mrl the MRL to read
* \return the newly created media or NULL on error
* \param p_instance the instance
* \param psz_mrl the MRL to read
* \return the newly created media or NULL on error
* \param p_instance the instance
* \param path local filesystem path
* \return the newly created media or NULL on error
* \param p_instance the instance
* \param path local filesystem path
* \return the newly created media or NULL on error
* \param p_instance the instance
* \param psz_name the name of the node
* \return the new empty media or NULL on error
* \param p_instance the instance
* \param psz_name the name of the node
* \return the new empty media or NULL on error