Testing fred fork, I noticed a small memory leak when I stay in one video snap with loop. It is 0.1 MB for each 5 seconds. FFmpeg from Ubuntu 14.04.
You can even move to a game without video snap, come back and you'll have the same memory usage. With 10 minutes I got 106 MB for cabrio, it started with 55 MB, and went to 77 MB with video.
sergio-br2