Membrane RTSP source

Cameras (at least the ones I’ve run into) usually have them, but I’m not sure in this particular case. That’s why I suggested @ConnorRigby to print the size of frames. But suppose RTSP source is supplying the desired RTP packets, SPS/PPS will come in single packet which probably translates to a single video frame, is Membrane smart enough to realize they are not picture frames, and wait for the next picture frame to arrive before calling ffmpeg to decode?