I'm trying to implement RTSP protocol in Java according to http://www.csee.umbc.edu/~pmundur/courses/CMSC691C/lab5-kurose-ross.html example; I have succeed up to successful communication with VLC via RTSP requests and streaming RTP packets; RTP packets with JPEG payload are not recognized by VLC well; that's why I supposed I send malformed RTP. I sniffed them with wireshark and compared them with packets, sniffed from successfull RTSP communication of gstreamer RTSP streamer and VLc. I was surprised, that both my app&VLC's RTSP and RTP requests were labeled in wireshark UI as simply TCP and UDP packets, while gstreamer&VLC's one were labeled as RTSP, RTP, RTCP, and even RTSP/SDP.
I'm really confused, I don't understand why VLC's requsts in some cases are parsed by wireshark as pure RTSP/RTP, and im my case as plain TCP/UDP data. At least, VLC's requests are not malformed, even if my are.
How can I force wireshark to recognize that requests as some specific protocol?