シーンを変更するか Stop 関数を呼び出さない限り、多くの CPU パワーを消費して実行を続けます
Also note that MovieTextures does not behave exactly the same as for example audio clips. When you call the Play() method on a MovieTexture, it is the Asset that will start playing, and not a particular instance of the movie. This means that if you have for example several planes in your scene, all having the same MovieTexture set as their materials texture, when you call Play() on one of them, every instance of the Movie will start playing.
See Also: Stop, audioClip.