Example uses Java script to use Flash player to show .mp4 (H.264) video clip:
Checks for Flash major version "10", but doesn't seem to worry if the version is less. Note that I have not been able to make the Safari web browser work for any version check more detailed than just the major version
The entries on the SWFObject line:
var so = new SWFObject('./player.swf','dougzz','640','480','10,0,22,87');
are: The player swf file location; The id; Width; Height; Required version; (not included) Background color; (not included) Image quality.