The Motion Picture Experts Group (or MPEG) has been working on a standard for digital video. Here is the evolution of that standard.
MPEG-1 began
by allowing digital video files to play back on a single-speed CD-ROM player on
personal computers and early interactive set-top devices.
MPEG-2 set out
to achieve "VHS-quality" digital video at higher compression rates. (DVD and
satellite TV use the MPEG-2 standard.)
MPEG-3 was
supposed to be the HDTV standard, but never actually materialized.
MPEG-4 (ISO/IEC 14496) was originally conceived as a teleconferencing standard,
to work at lower frame rates and resolutions than MPEG-2 for better
teleconferencing performance. Due to the recent explosion of wireless PDAs and
LCD screens in cell phones, interactivity has since grown to be of major
importance.
MPEG-7,
currently in development, focuses on metadata, with the goal of being able to
identify, archive, search, filter, and reuse the objects and content of MPEG-7
digital video files.
MPEG-21 aims
to become a superset of all that came before it and will address issues covering
deployment, pay-per-view, monetization, branding, and privacy.
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