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duration

The length of the video in seconds.

currentTime

The current playing time of the video in seconds. This can be used in conjunction

with duration for some interesting effects, which we will explore later.

ended

true or false, depending on whether the video has finished playing.

muted

true or false. Used to inquire whether the sound of the playing video has been

muted.

paused

true or false. Used to inquire whether the video is currently paused.

There are even more properties that exist for HTMLVideoElement. Check

them out at this site.

Plain-Vanilla Video Embed

To demonstrate a plain-vanilla embed, we are going to work under our previously es‐

tablished rules for video formats. We will use three formats because no one format will

work in every browser. We have created a version of the Muir Beach video as a .webm,

an .ogg, and an .mp4. For the rest of this chapter, we will use all three formats in all of

our video embeds.

To support all three formats at once, we must use an alternative method for setting the

src attribute of the <video> tag. Why? Because we need to specify three different video

formats instead of one in our HTML page. To do this, we add <source> tags within the

<video> tag:

</video>

We put the .mp4 file second in the src list because newer versions of

Chrome will try to use the format, but performance is spotty. This might

cause issues on iOS (iPhone, iPad) devices and with older versions of

Safari. In those versions of Safari, the browser will not attempt to load

any other src type than the first one listed.

Basic HTML5 Video Implementation | 309

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When a web browser reads this HTML, it will attempt to load each video in succession.

If it does not support one format, it will try the next one. Using this style of embed allows

the code in Example 6-1 to execute on all HTML5-compliant browsers.

Also notice that we have set the width and height properties of the video. While these

are not necessarily needed (as we saw earlier), it is proper HTML form to include them,

and we will need them a bit later when we start to manipulate the video size in code.

Example 6-1. Basic HTML video

<!doctype html>

<head>

<title>CH6EX1: Basic HTML5 Video</title>

</head>

<body>

<div>

</video>

</div>

<div>

(Right-click To Control)

</div>

</body>

</html>

Figure 6-1 shows an example of the plain-vanilla video embed in an HTML5 page. There

are no controls displayed in the default settings, but if you right-click on the video,

controls will appear that can be used in conjunction with the embedded video.

Figure 6-1. HTML5 video embed

310 | Chapter 6: Mixing HTML5 Video and Canvas

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Video with Controls, Loop, and Autoplay

While a video displayed without controls might suit your needs, most users expect to

see some way to control a video. Also, as the developer, you might want a video to play

automatically or loop back to the beginning when it finishes. All of these things (if

supported in the browser) are very easy to accomplish in HTML5.

Adding controls, looping, and autoplay to an HTML5 video embed is simple. All you

need to do is specify the options controls, loop, and/or autoplay in the <video> tag,

like this:

</video>

As of this writing, loop does not work in Firefox; however, support is

expected in version 4.0.

The code to embed our Muir Beach video with controls, loop, and autoplay is in

CH6EX2.html in the code distribution. Figure 6-2 shows what a video with controls

looks like in Google Chrome.

Figure 6-2. HTML5 video embed with controls

You can see the full code in Example 6-2.

Example 6-2. HTML video with controls, loop, and autoplay

<!doctype html>

<head>

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<title>CH6EX2: Basic HTML5 Video With Controls</title>

</head>

<body>

<div>

</video>

</div>

<div>

(Autoplay, Loop, Controls)

</div>

</body>

</html>

Altering the Width and Height of the Video

In our first example, we showed how you could embed a video without changing the

default width or height. However, there are many good reasons why you might want to

change the default width and height of a video in the HTML page, such as fitting it into

a particular part of the page or enlarging it so that it is easier to see. Similar to embedding

an image into HTML with the <img> tag, a video will scale to whatever width and height

you provide in the <video> tag. Also, like with the <img> tag, this scale does not affect

the size of the object downloaded. If the video is 5 megabytes at 640×480, it will still be

5 megabytes when displayed at 180×120—just scaled to fit that size.

In Example 6-3 (CH6EX3.html), we have scaled the same video to three different sizes

and displayed them on the same page. Figure 6-3 shows what this looks like in HTML

(again, rendered in the Google Chrome browser).

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Figure 6-3. Controlling video width and height in the embed

Example 6-3. Basic HTML5 video in three sizes

<!doctype html>

<head>

<title>CH6EX3: Basic HTML5 Video: 3 Sizes</title>

</head>

<body>

<div>

</video>

</div>

<div>

(640×480)

<div>

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</video>

</div>

<div>

(320×240)

</div>

<div>

</video>

</div>

(180×120)

</body>

</html>

Now it is time for a more elaborate (and, we think, more effective) example of scaling

a video. By changing the width and height attributes of the <video> tag, we can scale

the video on the fly. While there might be a few practical reasons that you would do this

in a real-world situation, it is also an effective way to demonstrate some of the power

of the HTML5 <video> tag.

First, we need to add an HTML5 range control to the page:

<form>

Video Size: <input type="range" id="videoSize"

min="80"

max="1280"

step="1"

value="320"/>

</form>

We discussed the details of the range control in Chapter 3, but just to refresh your

memory, range is a new form control added to HTML5 that creates a slider of values.

We are going to use this slider to set the video size.

If the browser does not support the range element, a text box will appear

that will allow the user to enter text directly.

To capture the change to the video size, we need to add some JavaScript. We create an

event listener for the load event that calls the eventWindowLoaded() function when the

page loads (this should look very familiar to you by now):

window.addEventListener('load', eventWindowLoaded, false);

314 | Chapter 6: Mixing HTML5 Video and Canvas

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We need to set up a couple things in the eventWindowLoaded() function. First, we need

to add an event listener for a change to the videoSize form control we created in the

HTML page. A “change” to the control (for example, someone slides it right or left) will

create an event handled by the videoSizeChanged() event handler:

var sizeElement = document.getElementById("videoSize")

sizeElement.addEventListener('change', videoSizeChanged, false);

Next, we need to create a value that can be used to set both the width and the height of

the video at once. This is because we want to keep the proper aspect ratio of the video

(the ratio of width to height) when the video is resized. To do this, we create the variable

widthtoHeightRatio, which is simply the width of the video divided by the height:

var widthtoHeightRatio = videoElement.width/videoElement.height;

Finally, when the user changes the videoSize range control, the videoSize

Changed() event handler is called. This function sets the width property of the video to

the value of the range control (target.value), sets the height of the video to the same

value, and then divides by the widthtoHeightRatio value we just created. The effect is

that the video resizes while playing. Figure 6-4 captures one moment of that:

function videoSizeChanged(e) {

var target = e.target;

var videoElement = document.getElementById("theVideo");

videoElement.width = target.value;

videoElement.height = target.value/widthtoHeightRatio;

}

At the time of this writing, this example no longer works in Firefox.

Example 6-4 offers the full code listing for this application.

Basic HTML5 Video Implementation | 315

Figure 6-4. Controlling video width and height in JavaScript

Example 6-4. Basic HTML5 video with resize range control

<!doctype html>

<head>

<title>CH6EX4: Basic HTML5 Video With Resize Range Control </title>

window.addEventListener('load', eventWindowLoaded, false);

function eventWindowLoaded() {

var sizeElement = document.getElementById("videoSize")

sizeElement.addEventListener('change', videoSizeChanged, false);

var videoElement = document.getElementById("theVideo");

var widthtoHeightRatio = videoElement.width/videoElement.height;

function videoSizeChanged(e) {

var target = e.target;

var videoElement = document.getElementById("theVideo");

videoElement.width = target.value;

videoElement.height = target.value/widthtoHeightRatio;

316 | Chapter 6: Mixing HTML5 Video and Canvas

}

</script>

</head>

<body>

<div>

<form>

Video Size: <input type="range" id="videoSize"

min="80"

max="1280"

step="1"

value="320"/>

</form>

<br>

</div>

<div>

</video>

</div>

</body>

</html>

Preloading Video in JavaScript

It is often necessary to preload a video before you do anything with it. This is especially

true when using video with HTML5 Canvas, because what you want to do often goes

beyond the simple act of playing the video.

We are going to leverage the DOM and JavaScript to create a preload architecture that

can be reused and expanded upon. We are still not using Canvas, but this process will

lead directly to it.

To do this, we must first embed the video in the HTML page in the same way we have

done previously in this chapter. However, this time, we are going to add <div> with the

id of loadingStatus.

In practice, you probably would not display the loading status on the

HTML page.

Preloading Video in JavaScript | 317

This <div> will report the percentage of the video that has loaded when we retrieve it

through JavaScript:

<div>

</video>

</div>

</div>

In JavaScript, we need to create the same type of eventWindowLoaded() function that

we have created many times previously in this book. This function is called when the

HTML page has finished loading. In eventWindowLoaded(), we need to create two lis‐

teners for two more events that are dispatched from the HTMLVideoElement object:

progress

Dispatched when the video object has updated information about the loading pro‐

gress of a video. We will use this event to update the percentage text in the loading

Status <div>.

canplaythrough

Dispatched when the video has loaded enough that it can play in its entirety. This

event will let us know when to start playing the video.

Below is the code that creates the listeners for those events:

function eventWindowLoaded() {

var videoElement = document.getElementById("thevideo");

videoElement.addEventListener('progress',updateLoadingStatus,false);

videoElement.addEventListener('canplaythrough',playVideo,false);

}

The updateLoadingStatus() function is called when the progress event is dispatched

from the video element. This function calculates the percent loaded by calculating the

ratio of the already-loaded bytes (videoElement.buffered.end(0)) by the total bytes

(videoElement.duration) and then dividing that value by 100. That value is then dis‐

played by setting the innerHTML property of the loadingStatus <div>, as shown in

Figure 6-5. Remember, this is only for displaying the progress. We still need to do

something after the video has loaded.

function updateLoadingStatus() {

var loadingStatus = document.getElementById("loadingStatus");

var videoElement = document.getElementById("thevideo");

var percentLoaded = parseInt(((videoElement.buffered.end(0) /

318 | Chapter 6: Mixing HTML5 Video and Canvas

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