There is no "'HTML5' VIDEO".<p>AAPL and GOOG can use VIDEO tag for H.264-encoded video.<p>Mozilla and Opera can use VIDEO tag for Ogg Theora encoded video.<p>There are two distinct implementations: VIDEO/H.264 and VIDEO/Theora. Neither supports the other.<p>You got suckered by the "'HTML5' VIDEO" talk. Not your fault; even its proponents didn't address such video basics until it became too late.