Here is the test. If anyone goes to this thread, then the second usage of the video bb command will cause the movie or sound to automatically start. In the case of a .wav file example below, just click on any menu option to stop the sound and leave the post. But everytime you come back it will launch automatically.
The first use of {video} creates a button that you click (but even that triggers an event on a window's machine). If you use {video2} then it just launches automatically when the thread starts.
Video:
Video:
Note: Doesn't happen on MAC or some browsers. On Opera I get a dialog asking it I want to let it play. I've had mixed results on Firefox.
Cheers,
rfs