Ugh. Still having this problem. See here:
As the bees run along the walls, they should run smoothly. But they appear to j**k, as though the camera is repeating frames.
At long last I think I have figured this out. The culprit is the "3D Noise Reduction" feature in the camera. 3D noise reduction tries to average non-moving portions of adjacent frames in an attempt to reduce temporal noise. The non-RTSP stream received by the Reolink client does this properly, and outputs frames in order. The RTSP stream does _not_ do this properly, so it repeats some frames, which results in the stuttering effect that you see here. If you turn off the 3D Noise Reduction, then the RTSP stream works properly, although the bit rate goes way up. Other manufacturers implement 3D Noise Reduction properly in their RTSP streams.