Mobile Meow Bring YouTube to
the Mobile Web By YouTube's Greg Schechter

Greg Schechter The Web Warrior
schechter@google.com

Video

Video

A Brief History

Video

Flash

<video>

Video

Playback Stats

Flash Native <video>

Flash
Flash
== Flash

Flash Flash

Native

Native ○ For fallbacks, use
rtsp:// protocol (serving .3pg) if the device won't support HTML5 ○ Use custom protocol / URL scheme to launch your own Android, iOS native app (no Windows Phone yet) ■ youtube://video_id

<video>

The Different Browsers
Safari Android

The Different Browsers Opera Safari
Android Chrome Silk Mini Firefox Opera IE

The Different Browsers Opera Safari
Android Chrome Silk Mini Firefox Opera IE AMP LE S

By brownpau at http://www.flickr.com/photos/brownpau/533267369/

How do we start
<video>

The Source
<video src="funny_cat_video">

The Source
<video src="funny_cat_video.webm/mp4/ogg">

Mobile Formats Support Chrome Safari
Firefox Opera IE Android H.264 WebM Android 4+ Android 4+ Android 4+ HLS Android 3+ Platform Versions and Distribution

The Source <video> <source src="funny_cat_video.mp4">
<source src="funny_cat_video.webm"> </video>

HLS = HTTP Live Streaming
<video src="playlist.m3u8">

HLS video-0-1.ts format-0.m3u8 video-0-2.ts ...
video-1-1.ts index.m3u8 format-0.m3u8 video-1-2.ts ... video-2-1.ts format-0.m3u8 video-2-2.ts ...

HLS Big Features ○ Live
and Adaptive Streaming ○ Built in CDN failover ○ Metadata + Cue Points Apple App Requirements ○ > 10 minutes in duration or 5 mb in 5 minutes ○ at least one 64 kbps or lower stream required Tools and more information on Apple's website: Apple's Using HTTP Live Streaming

Power

Power Consumption: H264 vs WebM
**fullscreen flash **windowed flash Research done by Yossi Oren For more information visit http://iss.oy.ne.ro/

Stick it in a page

Basic video tag Safari ○
Renders a thumbnail poster and play button (flaky) ○ Background is set to black and cannot be overwritten ○ If a parent element has display:none set at any point the video fails to playback properly Opera ○ Gives video dimentions black background if the information is available ○ Has issues with stretching WebM IE and Android ○ Play button/film icon for all video tags regardless if browser can play the format ○ Background is set to black/grey and cannot be overwritten

Give it a poster and
click it

Poster Attribute Use the poster
attribute to get a thumbnail Safari, Chrome, Android, and Opera ○ Preserve aspect ratio of poster image IE and Firefox ○ Stretch image to size of video tag IE ○ Keeps poster as paused state All Others ○ Replace video with the paused frame

Basic video tag Chrome ○
Default click to toggle play/pause ○ Remove with an empty onclick handler Safari ○ Will launch any supported video with or without an onclick handler Android and IE ○ Shows click interactions but does not play with empty onclick

Basic video tag Pro tips:
○ Create your own cued state to convey you can play the video ○ Set the background color to black for continuity across platforms

Controls
<video controls>

Controls Chrome Safari Firefox Opera
IE Android Play/pause Button Volume Only in Mute toggle Don't work in Controls Fullscreen only Android 4 Seek bar Fullscreen Button Gesture Button button Playback Both Fullscreen Inline only Determined Fullscreen Both Type only by hardware only

Custom Controls ● Preserve your
brand ● Unified experience across platforms and browsers

Custom Controls Lets get some
custom controls

Custom Controls ● Allows us
to expand the set of controls and add our own ○ annotations ○ playlist ○ captions ○ more

Custom Controls Pro Tips ●
User expect to be able to drag the progress bar ○ Need to remender to prevent scroll on touchstart ● Volume can't be set everywhere and users are accustomed to using device controls ○ So don't build controls for it

Custom Controls Pro Tips ●
Fingers are fat ○ Average finger is 11mm so make targets at least 40px with 10px padding ○ Use SVG's so icons can be scaled and shared with desktop application ○ Do what you can in css

Custom Controls Pro Tips ●
Don't trigger content with hover ● Fullscreen ○ The browsing context is always fullscreen so fake it

Fullscreen

requestFullScreen

requestFullScreen ● Desktop Only ○
Firefox, Safari, and Chrome ○ Vendor Prefixed

What about Mobile?

Isn't it already fullscreen?

Yes (sort of)

Mobile Fullscreen ● Open New
Tab ● webkitEnterFullscreen ■ Webkit only ■ Video element only ■ metadata must be loaded

Mobile Fullscreen ● Open New
Tab ● webkitEnterFullscreen ■ Webkit only ■ Video element only ■ metadata must be loaded ● Pro Tip: Remember size context changes so use viewport to scale icons and controls

@viewport { width: device-width; }

autoplay
<video autoplay>

autoplay In Safari on iOS
(for all devices, including iPad), where the user may be on a cellular network and be charged per data unit, preload and autoplay are disabled. No data is loaded until the user initiates it.

What about everyone else?

Autoplay Chrome Safari Firefox Opera
IE Android Attribute Scripted Buggy

autoplay

autoplay
<video onclick="this.play()">

autoplay function someClickEvent(evt) { //
In a user initiated thread. myVideoElement.load(); getVideoData(); // Triggers an ajax call. } function onGetVideoDataReturned(data) { // Not in a user initiated thread. setVideoElementSrc(data); myVideoElement.load(); myVideoElement.play(); }

autoplay function someClickEvent(evt) { //
In a user initiated thread. myVideoElement.load(); getVideoData(); // Triggers an ajax call. } function onGetVideoDataReturned(data) { // Not in a user initiated thread. setVideoElementSrc(data); myVideoElement.load(); // For Android window.setTimeout(function() { myVideoElement.play(); }, 0); }

Embeds

Embeds
<script>

Embeds <script> ○ We need
our content to be sandboxed ○ More than just a video tag

Embeds <script> ○ We need
our content to be sandboxed ○ More than just a video tag <object>

Embeds <script> ○ We need
our content to be sandboxed ○ More than just a video tag <object> ○ Can load content with the data attribute ○ But no way to interact with it via JavaScript

Embeds
<iframe>

Embeds <iframe> ○ Allows our
content to be sandboxed ○ JavaScript API communication

Embeds <iframe type="text/html" width="640" height="385"
frameborder="0" src="http://www.youtube.com/embed/VIDEO_ID" allowfullscreen> </iframe>

Embeds Pro tip: Plan for
the future (if you can) <iframe type="text/html" width="640" height="385" frameborder="0" src="http://www.youtube.com/embed/VIDEO_ID" allowfullscreen> </iframe>

Embeds Pro Tips: html {
/** Hack to fix iPhone resizing. */ overflow: hidden; }

Embeds Pro Tips: body {
/** Dymanic Resizing **/ background-color: #000; height: 100%; width: 100%; /** Remove highlight when use clicks **/ -webkit-tap-highlight-color: rgba(0, 0, 0, 0); }

Testing

Testing: The Old Fashioned Way
● Device lab ○ accurate ○ costly ○ space inefficient ○ boring

Testing: With Software ● Hardware
Emulators / Simulators ○ available for major systems ○ approximation varies ○ still boring ● Android Emulator ○ bulky, slow, no video codecs ● iOs Simulator ○ both tablet and phone

Testing: With Software ● Browser
Simulators ○ Poorer approximation ● Opera Mobile Simulator ○ missing video tag support ● Fennec (FF) Simulator ○ poor touch control mapping ○ sends desktop user agent

Testing: Automation ● Selenium! ○
use with simulated or real devices ○ not boring

Testing: Automation ● Android Webdriver
○ Still no video support ● iOS Webdriver ○ Need to register as ios dev ○ Intermittent issues with playback ● IE ○ No webdriver APIs for mobile

Testing: Automation ● Chrome, Opera
○ Driver APIs built-in ○ Remote debugging ● FFMobile ○ No webdriver APIs

Testing: Automation Strategy ● Test
API methods in mobile context first ○ cheap ○ can approximate video playback by video. currentTime

Testing: Automation Strategy ● More
sophisticated tests to follow ○ screenreader ● Screen cap processing ○ check for distortion ○ playback accuracy

Testing: Automation Strategy ● Screen
cap processing

Testing: Hardware Assistance for more
information check out http://bitbeam.org/

The Future Cats in Space
by WF&TD

Or

PointerEvents
http://msdn.microsoft.com/en-us/library/ie/hh673557(v=vs.85).aspx

http://imgs.xkcd.com/comics/in_ur_reality.png

Track <video> <track src="cats_meow" kind="subtitles">
</video>

Camera Access with
getUserMedia

More to learn ● HTML5
Video Spec ○ http://dev.w3.org/html5/spec-author-view/video.html ● Browser Blogs ○ http://dev.opera.com/ ○ http://hacks.mozilla.org/ ○ http://blogs.msdn.com/b/ie/ ○ http://peter.sh/ ● Documentation ○ https://developer.mozilla.org/en-US/ ● Other ○ http://developer.apple. com/library/safari/#documentation/AudioVideo/Conceptual/Using_HT ML5_Audio_Video/Device-SpecificConsiderations/Device- SpecificConsiderations.html

Questions? can haz question? By
cloudzilla http://www.flickr.com/photos/cloudzilla/378829651/ schechter@google.com