I've just produced my first experiment, and the results are pretty well unviewable. The problem is that the .MOV file straight from my action camera is far smoother than the rendered MP4 when I run it in, say, Media Player, which is so rough it looks like 60% of the frames are missing. Thing is, on the clip in question, there are no effects or adjustments - I've just dropped it on the timeline, cut a few seconds off the front and back, and put an audio track under it.
I'm very prepared to accept that it's me, not the software, but haven't a clue where to start troubleshooting this. Any pointers will be gratefully received!