I am working a patch that controls the playback rate(0-2) of a video from a serial input. When I am changing the rate the video becomes choppy, but once it is set at that rate it becomes smooth again. Any suggestions on how to fix this?

jit.qt.mov feeds into jit.window

Video Info format: .mov encoding: MJPG-A resolution: 1024x768 audio: none fps: 29.97