* @trans: a #GstRTSPStreamTransport
* @start_time: a star time
*
- * Get the RTPInfo string for @trans and @start_time.
+ * Get the RTP-Info string for @trans and @start_time.
*
- * Returns: the RTPInfo string for @trans and @start_time. g_free() after
- * usage.
+ * Returns: the RTPInfo string for @trans and @start_time or %NULL when
+ * the RTP-Info could not be determined. g_free() after usage.
*/
gchar *
gst_rtsp_stream_transport_get_rtpinfo (GstRTSPStreamTransport * trans,