HTML 多媒体

网络上的多媒体包括声音、音乐、视频、电影和动画。

什么是多媒体？

多媒体有多种不同的格式。它几乎可以是您能听到或看到的任何内容，例如图片、音乐、声音、视频、唱片、电影、动画等等。

网页通常包含不同类型和格式的多媒体元素。

第一个网络浏览器仅支持文本，仅限于单一颜色的单一字体。

后来出现了支持颜色、字体、图片和多媒体的浏览器！

多媒体元素（如音频或视频）存储在媒体文件中。

发现文件类型的最常见方法是查看文件扩展名。

多媒体文件具有不同的格式和不同的扩展名，例如：.wav、.mp3、.mp4、.mpg、.wmv 和 .avi。

那里有很多视频格式。

HTML 支持 MP4、WebM 和 Ogg 格式。

YouTube 推荐 MP4 格式。

Format	File	Description
MPEG	.mpg .mpeg	MPEG. Developed by the Moving Pictures Expert Group. The first popular video format on the web. Not supported anymore in HTML.
AVI	.avi	AVI (Audio Video Interleave). Developed by Microsoft. Commonly used in video cameras and TV hardware. Plays well on Windows computers, but not in web browsers.
WMV	.wmv	WMV (Windows Media Video). Developed by Microsoft. Commonly used in video cameras and TV hardware. Plays well on Windows computers, but not in web browsers.
QuickTime	.mov	QuickTime. Developed by Apple. Commonly used in video cameras and TV hardware. Plays well on Apple computers, but not in web browsers.
RealVideo	.rm .ram	RealVideo. Developed by Real Media to allow video streaming with low bandwidths. Does not play in web browsers.
Flash	.swf .flv	Flash. Developed by Macromedia. Often requires an extra component (plug-in) to play in web browsers.
Ogg	.ogg	Theora Ogg. Developed by the Xiph.Org Foundation. Supported by HTML.
WebM	.webm	WebM. Developed by Mozilla, Opera, Adobe, and Google. Supported by HTML.
MPEG-4 or MP4	.mp4	MP4. Developed by the Moving Pictures Expert Group. Commonly used in video cameras and TV hardware. Supported by all browsers and recommended by YouTube.

笔记：HTML 标准仅支持 MP4、WebM 和 Ogg 视频。

MP3 是压缩录制音乐的最佳格式。 MP3 一词已成为数字音乐的代名词。

如果您的网站是关于录制音乐的，那么 MP3 是您的选择。

Format	File	Description
MIDI	.mid .midi	MIDI (Musical Instrument Digital Interface). Main format for all electronic music devices like synthesizers and PC sound cards. MIDI files do not contain sound, but digital notes that can be played by electronics. Plays well on all computers and music hardware, but not in web browsers.
RealAudio	.rm .ram	RealAudio. Developed by Real Media to allow streaming of audio with low bandwidths. Does not play in web browsers.
WMA	.wma	WMA (Windows Media Audio). Developed by Microsoft. Plays well on Windows computers, but not in web browsers.
AAC	.aac	AAC (Advanced Audio Coding). Developed by Apple as the default format for iTunes. Plays well on Apple computers, but not in web browsers.
WAV	.wav	WAV. Developed by IBM and Microsoft. Plays well on Windows, Macintosh, and Linux operating systems. Supported by HTML.
Ogg	.ogg	Ogg. Developed by the Xiph.Org Foundation. Supported by HTML.
MP3	.mp3	MP3 files are actually the sound part of MPEG files. MP3 is the most popular format for music players. Combines good compression (small files) with high quality. Supported by all browsers.
MP4	.mp4	MP4 is a video format, but can also be used for audio. Supported by all browsers.

笔记：HTML 标准仅支持 MP3、WAV 和 Ogg 音频。