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Windows media audio 9 professional codec download |
Windows media audio 9 professional codec download
In music mode, the codec operates like the standard Windows Media Audio 9 codec. Encoded content can be configured to switch between voice and music modes automatically. The Windows Media Audio 9 Voice codec offers superior quality for low-bit-rate streaming scenarios less than 20 Kbps , such as radio broadcasts, advertising, e-books, podcasts, and voiceovers. The voice codec can also compress content to as low as 4 Kbps at 8 kHz. The 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.
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. VC-1 supports three profiles: Simple, Main, and Advanced.
The 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. The completion of the Advanced profile and consequent standardization of all profiles in VC-1 represents the final step in a comprehensive specification that delivers high definition content—either interlaced or progressive—across any medium and to any capable device.
It supports Simple, Main, and Advanced profiles. These profiles support a wide range of bit rates, from high-definition content at one-half to one-third the bit rate of MPEG-2, to low-bit-rate Internet video delivered over a dial-up modem. This codec also supports professional-quality downloadable video with two-pass and variable bit rate VBR encoding. Windows Media Video 9 is already supported by a wide variety of players and devices. 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 In the past, interlaced video content was always de-interlaced before encoding with the Windows Media Video codec.
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. Maintaining interlacing in an encoded file is important if the content is ever rendered on an interlaced display, such as a television. Transport independence also enables the delivery of Windows Media Video 9 Advanced Profile over systems that are not Windows Media-based, such as standards-based broadcast infrastructures through native MPEG-2 transport streams , wireless infrastructures using real-time transfer protocol [RTP] , or even DVDs.
The following table compares Windows Media Video 9 Advanced Profile to competing compression technology. The Windows Media Video 9 Screen codec is optimized for compressing sequential screen shots and highly static video that is captured from the computer display, which makes it ideal for delivering demos or demonstrating computer use for training. The codec takes advantage of the typical image simplicity and relative lack of motion to achieve a very high compression ratio.
During the encoding process, the codec automatically switches between lossy and lossless encoding modes, depending on the complexity of the video data.
For complex data, the lossless mode preserves an exact copy of the data. For less complex data, the lossy mode discards some data to achieve a higher compression ratio.
By automatically switching between these two modes, the codec maintains video quality while maximizing compression. Overall, the Windows Media Video 9 Screen codec delivers better handling of bitmap images and screen motion, even on relatively modest CPUs. It is also up to times more efficient than the commonly-used run length encoding.
Instead of processing uncompressed video, it transforms still images into video by using pan, zoom, and cross-fade transitions between clips to create an unlimited number of effects.
The results can then be delivered at data rates as low as 20 kilobits per second Kbps. This documentation does not cover these legacy codecs; it covers only the current versions of codecs. For older codecs, use the same procedures as when using the current codecs; however, remember that not all features are supported in all codecs. Media Foundation Programming Guide. Media Technologies for Windows.
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Note This documentation does not cover these legacy codecs; it covers only the current versions of codecs. Additional resources In this article. An audio codec that supports three categories of encoded content: Standard, Professional, and Lossless. Windows Media Audio Voice.
Audio codec optimized for encoding the human voice at high compression ratios.
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