Information about webm:
You need HAXE and NME. http://www.haxenme.org/
haxelib install nme-webm
var sprite:Sprite = new Sprite();
sprite.scaleX = 2;
sprite.scaleY = 2;
addChild(sprite);
var io:WebmIo = new WebmIoFile("c:/projects/test.webm");
var player:WebmPlayer = new WebmPlayer(io, sprite);
player.addEventListener('play', function(e) {
trace('play!');
});
player.addEventListener('end', function(e) {
trace('end!');
});
player.addEventListener('stop', function(e) {
trace('stop!');
});
player.play();