This method rarely works and I have never been able to use it myself but some people do claim that it works for them. Megavideo have wised to this in recent times and have stopped videos buffering after a certain point if they are not being watched. You can avoid this by letting the video play for a few seconds, this will make it buffer a little more each time.

That said this method very simple… so try it even though it may not work.

1. Let the video buffer to 100% even if you have to hit play a few times to wake it up
2. Once the video is buffered the whole way. Disconnect from the internet or hit the “Work Offline” button in some browsers
3. Watch the video staying offline for the duration.
4. Enjoy!