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management technology presents. That is a long to do list, but I believe it is realistic. For streaming media to fulfill its promise, the industry will need a great deal of will, vision, imagination, and courage; qualities that can be lacking during periods of economic uncertainty. To summarize, then, streaming media can be characterized quite simply and succinctly. Streaming media is almost great.
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APPENDIX A
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MPEG-4 was designed to allow efficient audio-visual coding in a wide variety of applications, using a multitude of transport technologies and systems. For this reason, the MPEG-4 standard provides a deep and rich set of tools for coding audio and video objects. This means that just about any practical system and application constraints can be met, but also that compliance to the standard is almost always going to be partial. Typically, no single encoder or decoder will be capable of producing MPEG-4 streams using any of the available tools. The complexity involved in creating a complete, ideal, universal coder would make it uneconomic for individual applications. So, the usual situation is going to be that the MPEG-4-compliant coder will implement a subset of the standard, cherry-picking various coding tools and techniques suitable for the application in question. MPEG-4 has defined what are called profiles. These are subsets of the MPEG-4 tools, which have been identified by the Motion Picture Experts Group (MPEG) that can be used for specific applications. Profiles limit the number of tools a particular decoder needs to implement, while providing a template for interoperability between individual vendors implementations. In principle, any vendor s coder than complies with a given profile will encode or decode audiovisual material that can be used with another vendor s coder. Remember that the details of how encoding is done is outside the scope of MPEG-4, which primarily defines how decoding is done. The point of profiles is that they provide target technical specifications that, if met, should ensure standards compliance. Within each profile defined in the MPEG-4 standard, there are also one or more levels. Whereas profiles limit the selection of tools, levels limit computational complexity. This is roughly tantamount to specifying
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Appendix A
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maximum throughput bit rates. From an application point of view, levels are typically matched to the transport system s available bandwidth. Hence, a combination of profile and level should allow a codec constructor to implement only the tools needed for his or her target application, while maintaining internetworking with other MPEG-4 devices built to the same specification of profile and level. It also allows for conformance testing, to check whether or not devices comply with the standard. End users, therefore, should always look for the profile and level specifications before accepting a vendor s word that their product is MPEG-4 compliant! There are profiles for audio material, visual material, graphics content, and scene descriptions. The MPEG does not prescribe or even advise on combinations of these profiles, though some care has been taken to ensure that good matches exist between the four different profile areas. Considering that there are some 30 available video profiles, 8 audio profiles, 4 graphics profiles, and 5 scene graph profiles (not to mention the additional profiles for portable, Java-based devices so called MPEG-J), the number of possible combinations and permutations is large! In practice, codecs will often support a number of different profiles and levels, so that the problem of identifying which vendor s codec works with another becomes somewhat complex. Profiles and levels are not new to MPEG-4. MPEG-2 defined a number of profiles and levels. Like any successful idea, the use of profiles and levels has proliferated in the MPEG-4 standard. Only time will tell whether or not the explosion in choices will limit or enhance the usefulness of profile and level compliance descriptions in the real world.
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