avi to wav, mp3, wma recorder

November 3, 2005 (Press Release) -- avi to wav, mp3, wma recorder
what's wma?
wma - Windows Media Audio. Windows Media Player 7, Windows Media Player for Windows XP, Windows Media Player 9 Series support playing wma file.
Click to play a sample .wma file (25KB)

Windows Media Audio (.wma) files are Advanced Systems Format (.asf) files that include audio that is compressed with the Windows Media Audio (WMA) codec. By using a separate extension, users can install multiple players on their computer and associate certain players with the .wma extension for playback of audio-only sources.

what's mp3?
MP3 is an acronym for MPEG-1 (or MPEG-2) Layer 3 audio encoding (it is not an acronym for MPEG3). MP3 is a popular compression format used for audio files on computers and portable devices.

The compression in MP3 works on the basis of a "psychoacoustic model" which means that parts of the audio that human ears cannot detect are discarded by the encoder. Although this is a LOSSY process, it can yield very high quality audio files are relatively high compression rates.

A typical MP3 file encoded at 128 kbit/s (12:1 compression) is near CD quality.

MP3 audio is increasingly being used in video production coupled with various MPEG-4 video codecs like divx. The audio may be encoded with a constant or variable bitrate.

what's wav?
WAV files are probably the simplest of the common formats for storing audio samples. Unlike MPEG audio and other compressed formats, WAVs store samples "in the raw" where no pre-processing is required other that formatting of the data.

The WAV file itself consists of three "chunks" of information: The RIFF chunk which identifies the file as a WAV file, The FORMAT chunk which identifies parameters such as sample rate and the DATA chunk which contains the actual data (samples).

Windows Media Player 7, Windows Media Player for Windows XP, Windows Media Player 9 Series support playing .wav files.
Click to play a sample .wav file (1,629KB).

What's avi?
Audio Video Interleaved - A multimedia file format for storing sound and moving pictures in RIFF format developed by Microsoft. An AVI file can use different codecs and formats so there is no set format for an AVI file unlike for example standard VCD video which sets a standard for resolution, bitrates, and codecs used.

Windows Media Player 7, Windows Media Player for Windows XP, Windows Media Player 9 Series support playing avi file. Click to play a sample AVI file (1,016KB)

Video codecs that are frequently used in .avi files include the following codecs:
DivX codec
For more information, visit the following DivX Web site:
http://www.divx.com (http://www.divx.com)

Cinepak codec
For more information, visit the following Cinepak Web site:
http://www.cinepak.com (http://www.cinepak.com)

Indeo codec
For more information, visit the following Ligos Web site:
http://www.ligos.com (http://www.ligos.com)

DV codec

MJPEG codec

Uncompressed RGB or YUY2 codec
Audio codecs that are frequently used in .avi files include the following audio codecs:
MP3 codec
For more information, visit the following Fraunhofer IIS Web site:
http://www.iis.fraunhofer.de (http://www.cinepak.com)

Microsoft Adaptive Differential Pulse Code Modulation (MS ADPCM)

Uncompressed Pulse Code Modulation (PCM) codec
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