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Want to know more? 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.
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