My site is a music site.
Most pages have two music players:
1. a "self-standing" flash player (html) which is programmed to start auto, and
2. BV's own windows media player (which appears as a "quicktime-strip" for some reason) as a backup. This one is programmed to start manually, in case something is wrong with the flash player.
Testing in both Firefox and Explorer there's no problem, the flash player starts auto, you can stop it and start the "strip" manually.
In Chrome, however, both start at the same time.