For the record, the video being "faster" is expected. That is what the « -r 16 » is for. I originally came up with this so the video would be shorter overall, and smaller in size too, thus resulting in a shorter full video. Our computer interfaces don't need a full 25 fps recording anyway.

Also, being a slow typer myself (~40 wpm), watching my own video felt slugish, and it was really frustrating to look at. Accelerating the video would make everyone a fast typist, plus it get straight to the point quicker.

Also @vain, the ffmpeg recording at 16 fps rather than 25, it should take less resource to record... Maybe that was the buffer size or something.