[Hypernova]

Do you mean like a VHS tape? Unfortunately the reversing cannot be done on compressed video file, since it use some forward-only predictions (P-frame) to reduce the information stored. The fast-forwarding is possible. You just increase the playback speed.

I always wish someone would make a player that can workaround this and give us a fast reverse like the old VHS day. The only way to do this, I think, is having another thread go back in the list of I-frames, cache part of the video before the current postion, and show the reverse. Too bad no one find it worth the effort. So you just have to live with skipping back.