Here's some simple tips that usually do the trick for solving video playback issues.
1) Just press Play, which will start the video buffering
2) Then press Pause
3) Then wait until the video has fully buffered (the loading bar at the bottom of the player finishes moving)
4) Then press Play again
It's not ideal, but taking a few minutes to buffer the video will avoid jerky video.
Try restarting your computer! A lot of times that's all that is needed.
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