Just a little comment on fastforward and rewind... Don't know about others, but I find these functions more useful when it's for example fastforward 10 secs and rewind 5 secs. With that kind of seeking you can basically search the spot in timeline you want using Newton's iterative method.

In more layman's terms, often you want to go forward in video to where you happened to be, though more than likely you miss the exact spot and go too far. In that case you want to go a little bit back. You might do this back and forth for a while until you find the correct spot. When the forward/rewind values are different it makes this process easier.

Just my two cents, whether or not above comments are taken into consideration, this is an excellent application so thank you very much for the updates!