WebM would not help you at all if you only want one codec, unless youre comfortable losing every iDevice immediately. If you want one codec, it's H.264. Native

WebM would not help you at all if you only want one codec, unless youre comfortable losing every iDevice immediately. If you want one codec, it's H.264. Native support on iOS and Android devices, and you can support Chrome via Flash (which is seriously making me think about switching back to FireFox).