video files (not live encoding) to give the
video files (not live encoding) to give the optimum processing. This provides improved encoding quality with both constant and variable bit rates, but of course does lengthen the encoding time. RealVideo 10 now supports interlaced video as well as progressive scan. As well as support for personal computers on the Windows, Linux, and Mac platforms, RealNetworks support mobile platforms like Symbian running on the ARM processor. Windows Media 9 Series Part of Microsoft s Windows Media 9 Series is the Windows Media Video codec. It is similar in principle to the MPEG-4 part 2 visual codec, but has been optimized to give better compression efficiencies. Microsoft played an active part in the development of the MPEG-4 standards, but in the interests of improved quality, has adopted the proprietary route. Microsoft has also forwarded the core codec for standardization by the Society of Motion Picture and Television Engineers (SMPTE) as video codec 9 (VC-9). This would open the way for thirdparty developers to adopt the VC-9 compression codec. Windows Media is Microsoft s implementation of the VC-9. There are two video codecs, the basic codec and the Windows Media Video 9 Professional. The latter is for high-definition services, delivered by DVD or wide-band circuits, and supports line rates up to 1,080. The basic codec is more suited to regular streaming applications at bandwidths below 1 Mbit/s. The advanced profile will support 2,048 1,536 for digital film applications. Windows Media 9 supports constant and variable bit rate encoding (see Table 5.3). The video streams can be encoded at multiple bit rates for intelligent streaming over congested networks. 100 The Technology of Video and Audio Streaming Table 5.3 Windows Media 9 Encoding Options Bit rate Encoding method Notes constant (CBR) Stream data rate is constant one-pass For live encoding two-pass Improved quality over one-pass variable (VBR) Consistent video quality quality-based Bit rate varies to give constant quality bit-rate based Two-pass process, encodes for a set average bit-rate peak bit rate Maximum rate constrained to fit streaming data channel, a two-pass process
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