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Web pages can also include multimedia files: animations, audio and video files. Sounds and video are recorded with different formats.
MIDI (Musical Instrument Digital Interface) – a MIDI file doesn’t contain actual audio data, but rather contains commands that let MIDI-capable synthesizers re-create a specific musical passage. The MIDI protocol has been used for years as a way for electronic musical instruments (like digital keyboards and sequencers) to communicate with each other.
MPEG – MPEG stands for Moving Picture Experts Group – a committee that sets international standards for the digital encoding of movies and sound.
MPEG1. This format is often used in digital cameras and camcorders to capture small, easily transferable motion video clips. It’s also the compression format used to create Video CDs.
MPEG2. Commercially produced DVD movies, home-recorded DVD discs, and digital satellite TV broadcasts all employ MPEG2 video compression to deliver their high-quality picture.
MPEG4. This newer, very flexible MPEG codec is used for both streaming and downloadable Web content, and is also the video format employed by a growing number of portable video recorders.
MP3 (MPEG1, Audio Layer 3) – the most popular codec for storing and transferring music.
MP3 Pro – an updated version of the original MP3 codec, MP3 Pro allows small, low-bitrate files to contain much more high -frequency detail than standard MP3 files encoded at similar low bitrates.
AAC (Advanced Audio Coding) – an up-and-coming compression format for digital audio. In terms of sound quality and data efficiency, AAC solidly beats the still-popular MP3 format – not surprising, since AAC is a newer, more advanced form of compression.
AU – an audio format commonly used for posting sound clips on the Internet. AU files can be played back on Windows, Macintosh, and other operating systems.
WAV – a standard audio format for Windows operating systems, often used for storing high-quality, uncompressed sound.
WMA (Windows Media Audio) – developed by Microsoft, Windows Media Audio is one of today’s most popular Net audio formats.
WMV (Windows Media Video) – Microsoft’s proprietary compression format for motion video, Windows Media Video is used for bot h streaming and downloading content via the Internet. Ogg Vorbis = Vorbis – is an “open-source” digital audio compression format. It exists in the public domain and is completely free for commercial or non-commercial use. QuickTime – is a file format for storing and playing back movies with sound. RealMedia – one of the most popular formats for streaming content on the Internet, RealMedia includes the RealAudio codec for sound clips and RealVideo codec for movies.
SDII (Sound Designer II) – an audio format for Macintosh operating systems which is often employed by pro-quality sound editing software applications.
SDMI (Secure Digital Music Initiative) – isn’t a type of file format; rather, it’s a copyright protection system for digital music files.
SHN (Shorten) – shorten is a “lossless” form of compression for digital audio.
Variable Bitrate (VBR) – much newer audio and video codecs employ a technology known as variable-bitrate encoding, which allows resulting files to look and sound better, while still retaining a compressed, convenient file size.
Shockwave and Flash are technologies that enable web pages to include video and animations. Java applets, specific applications using that programming language, may be used to add interactivity to web pages.
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