Hint: you can press Shift+WIN+S key combo to take a screenshot. The screenshot can be then seen via the icon on the Windows notification area, and you can save it to a file. Or just CTRL+V to paste it anywhere.
Yes, the dropped/repeated frames are a symptom, especially if they keep going up. Looks like JRVR doesn't print the source frame rate, so I can't really tell, but it looks like you're playing on a Laptop screen with a fixed 60Hz refresh rate. Any video that is not a multiple of that (ie, PAL/25Hz or Film/24Hz content) will need to be adjusted in speed by dropping or repeating frames, causing visual jumps in fast moving scenes. You can check the "FPS" tag in MC for that file to see the source refresh rate (frames per second).
MC can automatically change the screen's refresh rate to match the content being played, but that's usually not possible on a cheap laptop screen.
@Hendrik, can you please add the source refresh rate to JRVR debug info?