OK, so “gst-launch with startx” has absolutely nothing to do with what you are in effect asking for. You are in general unable to play an RTSP stream, correct? How do you know that whatever stream you are trying to play is even correct? Did you have a look at the following article on our developer website already? OK, admittedly that one is about RTP and not RTSP. I guess if RTSP support is really missing in our regular demo images you may easily add it to your custom image. Looks like gst-rtsp may be part of the meta-multimedia layer. Alternatively, you may try running JetPack which comes with RTSP support.
