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One of the most important aspects of mp4 player technology is that it resembles more closely community developed standards like TCP/IP and Linux than it does specifications that are produced by manufactures such as Microft (Windows) and Sun Microsystems ( now owned by Oracle, and the developer of the Sparc Unix workstation technology). Versions of the mp4 player standards are almost indefinable and the most common terms are extensions, layers and profiles. Layers and extensions are exactly what a person would expect them to be and define the relationships of one part of a standard to others and the addition of features and capabilities. Profiles tell about the way that the standard addresses different parts of the components of the standards and in some cases, how implementation of the profile that may be achieved for the component being addressed. There are profiles for the mp4 player audio and mp4 player video components. These profiles are strictly adhered to by mp4 player manufacturers in order to maintain product compatibility. The mp4 player products are downward compatible with mp3 players. This means that an mp4 player must be able to reproduce mp3 material. There is no provision for an mp3 player to reproduce mp4 player material at a lower quality. The sampling, encoding, and decoding are completely different and use different componentry. The mp4 player standard reflects the increase in the power of the basic chips needed for the processes of sampling, encoding, and decoding the mp4 player material.. The increase in miniaturization is also of great importance to the growth of the quality of the end product of both audio and video both in current mp4 player technology and the future technologies being dreamed up by the guru’s of both the chip manufacturers and the end user community. With chip capability and size progressing the way that they are, it can be expected that 3d devices that do not need special glasses are in the field of vision of the hand held portable entertainment industry and that the prices of such devices will be affordable and will represent current “must have” consumerism. It is often wondered what happens to entertainment and information products that have become obsolete and have been discarded by their original owner. There is an after-market for telephones but the existence of an aftermarket for pure mp4 players is an unknown unless they are incorporated into a phone.
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