Apple QuickTime QuickTime supports a large number of
Apple QuickTime QuickTime supports a large number of video formats, including uncompressed, but came late to streaming. Most of the codecs are for authoring CD-ROMs. As a general-purpose multimedia production tool in an editing environment, Quick- Time can be used to wrap DV content and motion JPEG. Apple does not offer their own streaming codecs, but now supports the MPEG-4 codecs. RealNetworks The RealVideo 10 codec replaces earlier Real codecs with improved compression efficiency and support for high-definition video at 720 and 1080 lines. RealVideo 10 files are backward-compatible with RealVideo 9 decoder. SureStream allows the content files to include video and audio encoded at different bit rates. The streaming server can optimize the delivery rate to suit the network conditions. Variable bit rate encoding can be used to maintain a constant video quality level. Two-pass encoding can be used for prerecorded Video compression 99 transaction use relationship authorization value exchange Identification & representation Digital item representation Content representation Intellectual property management & protection Content management & usage Terminals & networks User B User A Unique identifiers Content descriptors Natural & synthetic Scalability Storage management Content personalization Unique identifiers Content descriptors Encryption Authentication Watermark Container Item Resource content Figure 5.10 MPEG-21 framework.
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