Need a media player that can do the following two things: 1. Have or can customize hotkeys to speed up/down video speed on the fly 2. Can play flash video (f4v) files I have a large number of lecture files that I need to go through in the next couple of months, and would like the ability to speed up and down the video quickly so I can skim through unimportant bits. When I was using windows I used kmplayer which worked beautifully but unfortunately they don't have a mac version Would appreciate any help. Thanks!