philomax, if you start to play the movie each time a tag is read, and if you need such tag to be read to display one image of the movie, you are indeed in trouble.
You should call play() only once, the first time the tag is read. Use a boolean variable to check the tag. And move the image() call somewhere else, probably in the movieEvent() or in draw().
You should call play() only once, the first time the tag is read. Use a boolean variable to check the tag. And move the image() call somewhere else, probably in the movieEvent() or in draw().