18. HTML5 Video and Audio

Video Tags Overview:

The <video> element provides play, pause, and volume controls to control the video.

The <video> element also provides the width and Height properties to control the size of the video. If you set the height and width, the required video space is retained when the page loads. If you do not set these properties and the browser does not know the size of the video, the browser will not be able to load a specific space, the page will vary depending on the size of the original video.

The content inserted between <video> and </video> tags is presented to browsers that do not support video elements.

The <video> element supports multiple <source> elements. <source> elements can be linked to different video files.

The <video> element also supports subtitle element <track>.

Browser-supported video formats for video tags:

Browser	MP4	WebM	Ogg
Internet Explorer	YES	NO	NO
Chrome	YES	YES	YES
Firefox	YES	YES	YES
Safari	YES	NO	NO
Opera	YES (from Opera 25)	YES	YES

• MP4 = MPEG 4 file with H + video encoding and AAC audio encoding
• WebM = WebM file with VP8 video encoding and Vorbis audio encoding
• OGG = Ogg file with Theora video encoding and Vorbis audio encoding

To add a video, you should add the video folder to the front-end directory and store the file in that directory:

format	Mime-type
MP4	Video/mp4
WebM	Video/webm
Ogg	Video/ogg

<track> subtitle Effects:

Properties	value	Description
Default	Default	Specifies that the track is the default. If the user does not select any tracks, the default track is used.
Kind	Captions Chapters Descriptions Metadata Subtitles	Specifies the text type of the text track.
Label	Text	Specifies the label and title of the text track.
Src	Url	Required. Specifies the URL of the track file.
Srclang	Language_code	Specifies the language of the track text data. This property is required if the kind property value is "subtitles".

Audio Overview:

The control property is used to add play, pause, and volume controls.

Between <audio> and </audio> you need to insert the hint text of the <audio> element that the browser does not support.

The <audio> element allows multiple <source> elements to be used. <source> elements can link different audio files, the browser will use the first supported audio file

MIME type for audio format:

Format	Mime-type
MP3	Audio/mpeg
Ogg	Audio/ogg
Wav	Audio/wav

HTML5 <video>-Control using the DOM

HTML5 <video> and <audio> elements also have methods, properties, and events.

The methods, properties, and events of <video> and <audio> elements can be controlled using JavaScript.

The methods are used for playing, pausing, loading, and so on. The properties (such as length, volume, etc.) can be read or set. DOM events can inform you, for example, that the,<video> element starts playing, paused, stopped, and so on.

For more information, see the HTML5 audio/video DOM reference Manual

18. HTML5 Video and Audio