When using playbin (and decodebin2) for playing RTSP stream, the "stream-info" contents seem to vary between the runs and clips. I made a test application that registers a handler for "notify::stream-info" signal in playbin. In that handler I find video-related information and print the caps, both from "caps" object and from decoder srcpad. They vary like this:

1st case: I used internal own RTSP streaming server, URI not available).
Run 1:
  caps from streaminfo: video/x-raw-rgb; video/x-raw-yuv
  caps from decoder srcpad: video/x-raw-rgb; video/x-raw-yuv

Run 2:
caps from streaminfo: video/x-raw-rgb; video/x-raw-yuv
caps from decoder srcpad: video/x-raw-yuv, width=(int)352, height=(int)288, framerate=(fraction)15/1, format=(fourcc)I420

For some streams (e.g. rtsp://stream.serv.ch/samples/sample_100kbit.mp4) it gives caps but they are not final:

video/x-raw-yuv, format=(fourcc)I420, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ]

What I need is the resolution of the video. Looks like some kind of race condition, since in case 1 the bin was able to give correct values *sometimes*.