Difference between revisions of "Windows Media Audio"

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'''Windows Media Audio''' ([[WMA]]) is a proprietary compressed audio file format used by Microsoft. It was initially a competitor to the [[MP3]] format, but with the introduction of Apple's [[iTunes]] Music Store, it has positioned itself as a competitor to the [[advanced audio coding]] format used by Apple. It is part of the Windows Media framework. An initial reason for the development of WMA might have been that [[MP3]] technology is patented and has to be licensed from Thomson for inclusion in the Microsoft Windows operating system.However Windows Media Player 10 for Windows XP now also includes MP3 encoding as an option for CD ripping.
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WMA is Microsoft's compressed audio format. It's actually a generic name for several codecs that can be used inside it:
  
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=Windows Media Audio=
  
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Also known as WMA Standard, it was created by Microsoft to compete against MP3, that was quickly becoming the de-facto standard format for lossy compression.
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Even though Microsoft claims it is able to deliver the same quality as MP3 at half the bitrates, that statement is certainly false. A more realistic number would be same quality at around 25% smaller bitrates - and that applies to low bitrates only. At 128kbps, it is easily beaten by Lame.
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WMA Std is the second most widespread lossy format (only losing to the ubiquitous MP3), mostly thanks to Microsoft's aggressive marketing tactics.
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==Windows Media Audio Professional==
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Windows Media Audio Professional (WMA Pro) was recently released to address limitations in WMA Standard. It supports multichannel encoding and high resolutions (24bit, high sampling rates)
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Since it's backwards incompatible with WMA Std, Microsoft took the opportunity to make a high quality encoder out of it. Meanwhile WMA Std lost even to MP3 in an informal public listening test, WMA Pro was ranked at the top (next to other high quality formats) in a similar test.
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These days, Microsoft is pushing the Pro codec for inclusion in the next generation DVD standard as standard audio format.
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==Windows Media Audio Lossless==
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This is the matematically lossless codec in the Windows Media family. It's a welcome addition since it was the first lossless codec backed up by a major player in the multimedia compression field. Compression efficiency-wise, it's on par with WavPack high and between Monkey's Audio fast and normal.
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==Windows Media Audio Voice==
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This codec, among the first ones to be added to the Windows Media portfolio, is VoiceAge's [[ACELP]].net. It delivers very acceptable voice quality at bitrates around 4 and 20kbps.

Revision as of 02:25, 26 March 2005

WMA is Microsoft's compressed audio format. It's actually a generic name for several codecs that can be used inside it:

Windows Media Audio

Also known as WMA Standard, it was created by Microsoft to compete against MP3, that was quickly becoming the de-facto standard format for lossy compression.

Even though Microsoft claims it is able to deliver the same quality as MP3 at half the bitrates, that statement is certainly false. A more realistic number would be same quality at around 25% smaller bitrates - and that applies to low bitrates only. At 128kbps, it is easily beaten by Lame.

WMA Std is the second most widespread lossy format (only losing to the ubiquitous MP3), mostly thanks to Microsoft's aggressive marketing tactics.


Windows Media Audio Professional

Windows Media Audio Professional (WMA Pro) was recently released to address limitations in WMA Standard. It supports multichannel encoding and high resolutions (24bit, high sampling rates)

Since it's backwards incompatible with WMA Std, Microsoft took the opportunity to make a high quality encoder out of it. Meanwhile WMA Std lost even to MP3 in an informal public listening test, WMA Pro was ranked at the top (next to other high quality formats) in a similar test.

These days, Microsoft is pushing the Pro codec for inclusion in the next generation DVD standard as standard audio format.


Windows Media Audio Lossless

This is the matematically lossless codec in the Windows Media family. It's a welcome addition since it was the first lossless codec backed up by a major player in the multimedia compression field. Compression efficiency-wise, it's on par with WavPack high and between Monkey's Audio fast and normal.


Windows Media Audio Voice

This codec, among the first ones to be added to the Windows Media portfolio, is VoiceAge's ACELP.net. It delivers very acceptable voice quality at bitrates around 4 and 20kbps.