I using RTSP for transmitting video from server to client.
At some points during the transmission I need the server to "send" metadata to the client (some information that something was changed).
I need the sessions to be fully "standard" (VLC should be able to display the video).

I thought of sending DESCRIBE to the server at some interval from the client and using the SDP data to contain the relevant information.

Is it a "standard" approach? shouldn't the DESCRIBE be used for initialization purposes only?

Thanks.