I was using VLC to view RTSP streams from wyzecams and it wasn’t a good experience (often froze and wouldn’t recover) so I searched for something else to do the trick. Found it. You can use free software OBS and it does a way better job (at least for me):
With OBS you can even view multiple cameras in one window. To view a wyzecam with RTSP enabled just hit the plus button in the “Sources” dock, choose “Media Source”, name it, hit OK, and in the new window uncheck “Local File”, and then just type in your RTSP address in the “Input” input and hit OK. You can now resize the video window, move around at will, and add other cameras at will.
You can even record and/or stream the camera outputs easily.