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Audio and Video File Formats: An Introduction

FILE FORMATSThere are several audio file Media Audio A digital system invented by
formats in common use. There are fewer Microsoft, and is used in portable
video file formats, but audio video file digital audio players. Using WMA, a file
extensions can be confusing. This is just can be programmed so that it cannot be
a brief description of what the more copied, and can be used to protect
commonly used audio and video file copyright.WMF: Windows Media Format These
formats and systems are.AAC:Advanced are audio-video files comprising WMA and
Audio Coding This is the audio file video codecs. They provide high quality
format used by Apple for the iTunes Music and media security for streaming and
Store, and it may appear with the M4A download and play applications on
filename extension. It is better than MP3 computers.WMV: Windows Media Video Used
for sound quality. It was developed as in the Windows media Player, this is used
part of the MPEG4 group owned by Dolby to stream and download and play audio and
(see below).AU: This audio file format is video content.When dealing with audio and
the standard used by Java, Sun and video file formats, you will sometimes
Unix.MPEG: Moving Pictures Expert Group notice the term 'codec'. A codec is
There are a number of MPEG types now, simply short for encoder-decoder (or
described below.MPEG-1: This is used in compressor - decompressor). A main
digital cameras and camcorders for small function of a codec is to compress audio
video clips. VHS quality playback can be or video data streams so that
expected from MPEG-1.MPEG-2: Used for transmission of digital audio samples and
digital satellite TV, professional movie video frames can be speeded up and
recording and recording of home DVD storage space reduced.The objective of
recordings. Provides provision for all codecs is to reduce the file size to
multi-channel surround sound a minimum while maintaining audio and
recordings.MPEG-3: MPEG-3 was propose as video quality. A quick indication of the
an entity, but eventually merged into codec's place in the path of transmission
MPEG-2.MPEG-4: This is the newest MPEG and reception is:Video device (e.g.
system and is used for streaming internet camcorder) - video capture card - video
content. It is also used in portable digitized - codec (compresses digital
video recorders and for internet info) - result (MPEG2, AVI, WMV etc) -
downloads. Required for DivX. It improves codec (decompress) - video frames -
digital broadcasting and interactive display device.Between the two codecs the
graphics and multimedia.MP3: Digital compressed result is transferred to the
audio files, most commonly used to store display device transmitted, stored on
and playback music. It compresses the file, etc). So to condense the flow even
files to about 10% of a normal audio further, we could basically describe it
file, and a normal music track will be as:raw data - codec - transmit - codec -
about 5 -6 MB in size. MP3 stands for playThis is simplistic, but it shows
MPEG-1 Audio Layer 3, not MPEG-3 as many where the codecs are used. Therefore, in
people think. A typical MP3 audio file is order to play a movie, video or piece of
near CD quality.OGG: An audio file format music of a certain format, you need a
supporting a variety of codecs, the most codec in your computer to allow you to
popular of which is the audio codec decompress the file and play it.Here is
Vorbis. However, MP3 files are much more some free software which checks what
broadly supported than Vorbis.RA: Real codec a video system uses, and what codec
Audio This format is designed for your system needs to play it:Codec
streaming audio over the Internet. It is Tool.The different video file formats are
a self-contained file format with all the required to meet the requirements of
audio information stored within the file various video devices. Similarly, audio
itself.WAV: The simplest of the audio file formats are designed to meet the
file formats, developed by Microsoft and needs of the specific delivery methods
IBM, and built into Windows 95. It is an and storage and playback devices
uncompressed audio file format with large introduced by large corporations such as
file sizes (10 x MP3), and does not need Microsoft, Sony and Apple. Thus, Sony
further processing to play. The WAV file invented the UMD (Universal Media Disk)
consists of three blocks of information: for the PSP (Playstation Portable), and
The RIFF block which identifies the file Apple introduced AAC (M4A) for its
as a WAV file, The FORMAT block which iPod.Peter Nisbet is the author of many
identifies parameters such as sample rate articles on audio and video file systems,
and the DATA block which contains the their transmission, playback and
actual data, or music sample.WMA: Windows conversion.




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