As with all Windows Media 9 Series codecs, it supports the Windows Media digital rights management platform, which is used to securely package and distribute copy-protected digital media. With VBR, the encoding bit rate increases to capture complex sections of data and then decreases to maximize the compression of the less complex sections, producing compact, high-quality compression.WMA 9 is backward-compatible with previous Windows Media Audio-compatible decoders, which means that WMA 9 content can be played with previous versions of Windows Media Player or older consumer electronic devices that support Windows Media. The resulting sound quality is 20 percent better than audio sampled with Windows Media Audio 8 at equivalent data rates.The Windows Media Audio 9 codec (WMA 9) supports variable bit rate encoding (VBR), which enables even higher quality audio at smaller file sizes by automatically varying the encoding bit rate according to the complexity of the audio data.Audio Data* Content dependent Windows Media Audio 9 LosslessThe audio quality of content that is compressed using this codec is the best of all Windows Media Audio codecs. Using the Quiet Mode feature in Windows Media Player 9 and later, users can hear either the full dynamic range, a medium difference range up to 12 decibels (dB) above the average, or a little difference range up to 6 dB above the average.If a user tries to play back a file that was encoded using the 5.1 channel, 24-bit, 96 kHz sampling capabilities, but does not have a system or sound card that supports multi-channel or high-resolution sound, multiple channels are combined into stereo audio (for example, 16-bit, two channel audio), ensuring that users get the best playback experience their systems can provide.The following table compares WMA Pro to competing compression technology. WMA Pro also offers dynamic range control using the maximum and average audio amplitudes that are calculated during the encoding process. WMA 10 Pro supports streaming, progressive download, or download-and-play delivery at 128 to 768 Kbps.When using 5.1 surround sound audio compressed at 384 Kbps with WMA 10 Pro, most listeners cannot discern any differences between the compressed music and the original pulse code modulation (PCM) files. WMA 10 Pro offers incredible quality for consumers using high-fidelity hardware and 5.1 channel surround sound-equipped computers — and for consumers playing audio content on their mobile devices.In music mode, the codec operates like the standard Windows Media Audio 9 codec. In voice mode, the codec takes advantage of the relatively less complicated and narrower frequency range of the human voice to maximize compression. Windows Media Audio 9 VoiceThis low-bit-rate codec is primarily targeted for speech content, but performs very well with mixed-mode content that includes both voice and music. Using the Quiet Mode feature in Windows Media Player 9 and later, users can hear the full dynamic range, a medium difference range up to 12 dB above the average, or a little difference range up to 6 dB above the average. Although this is lower than the ratio achieved with other Windows Media Audio 9 Series codecs, it provides the same benefits of compression while leaving the data intact.Like Windows Media Audio 9 Professional, the Windows Media Audio 9 Lossless codec also offers dynamic range control using the maximum and average audio amplitudes that are calculated during the encoding process.
Avi Codec Pack Mac OS X And WindowsThis table also lists the compatibility for Apple Mac OS X and Windows CE–based platforms. CompatibilityThe following table outlines what your audience will experience when playing Windows Media Audio 9 Series content on earlier Microsoft Windows operating systems than Windows XP or with earlier versions of Windows Media Player. The voice codec can also compress content to as low as 4 Kbps at 8 kHz. Word excel powerpoint for mac freeThe Simple and Main profiles have been complete for several years, and existing implementations such as WMV 9 have long supported the creation and playback of content using these profiles, as well as an early implementation of the Advanced profile. VC-1 supports three profiles: Simple, Main, and Advanced. Formal standardization of VC-1 represents the culmination of years of technical scrutiny by over 75 companies, leading to a codec that is well-documented, extremely stable, easily licensable, and accepted by the industry. Windows Media Player for Pocket PC and Windows Media Player for Smartphone are not available for download from Microsoft.In 2006, the Society of Motion Picture and Television Engineers (SMPTE) formally published the Final Specification for SMPTE 421M, also known as VC-1. Now, encoding applications such as Windows Media 9 Series, and third-party encoding solutions can support compression of interlaced content without first converting it to progressive content. Content creators can use this profile to deliver either progressive or interlaced content at data rates as low as one-third that of the MPEG-2 codec—with the same quality as MPEG-2.In the past, interlaced video content was always de-interlaced before encoding with the Windows Media Video codec. Advanced ProfileThe Windows Media Video 9 Advanced profile fully conforms to the SMPTE VC-1 standard, supports interlaced content, and is transport-independent. Windows Media Video 9 is already supported by a wide variety of players and devices.
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