Audio and Video
Audio and video can be used in Web pages in a variety of ways. Audio and video files can be embedded in a Web page or placed on a Web server such that they can be downloaded “on-demand.” A variety of audio and video file formats are available for different uses.
Common video file formats include MPEG (Moving Pictures Experts Group), Quick-Time, RealPlayer, AVI (Video for Windows) and MJPEG (Motion JPEG). Audio formats include MP3 (MPEG Layer 3), MIDI (Musical Instrument Digital Interface), WAV (Win-dows Waveform) and AIFF (Audio Interchange File Format—Macintosh only).
Encoding and compression determine a file’s format. An encoding algorithm or
CODEC compresses media files by taking the raw audio or video and transforming it into a format that Web pages can read. Different encoding levels and formats produce file sizes that are ideal for different applications.
Some CODECs are available to the public in the form of encoding applications. Most encoding applications compress audio and video files. Some serve as format converters, converting one file format into another.
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