HTML5 video full preload in javascript

Question

I have a high quality video which I cannot compress too much as it's going to be the base of a lot of image analysis whereby each frame will be redrawn into the canvas and then manipulated.

I'm trying to preload the whole thing before playing it as I can't have the video stop, buffer and continue. Is there an event which I can listen for which signifies that the whole video has preloaded before I commence playback?

Here's how I'm doing it in JS/jQuery:

this.canvas            = this.el.find("canvas")[0];
this.video             = this.el.find("video")[0];
this.ctx               = this.canvas.getContext("2d");
this.video.autoplay    = false;

this.video.addEventListener("play",this.draw)
this.video.addEventListener("timeupdate",this.draw)
this.video.addeventlistener("ended",this.trigger("complete",this))

Answer 1

This will load the entire video in JavaScript

var r = new XMLHttpRequest();
r.onload = function() {
    myVid.src = URL.createObjectURL(r.response);
    myVid.play();
};
if (myVid.canPlayType('video/mp4;codecs="avc1.42E01E, mp4a.40.2"')) {
    r.open("GET", "slide.mp4");
}
else {
    r.open("GET", "slide.webm");
}

r.responseType = "blob";
r.send();