Multi-media SpecificationsUnfortunately, few animation specifications have been released to the public domain. While most can be acquired from ANSI and ISO, you have to pay $200US+ for each spec.
Some standard formats include MPEG, Microsoft's AVI and Apple's Quicktime.
The GIF89a specification provides extensions that are used by some web browsers to support animated GIFs.
Other ReferencesMoving Picture Experts Group (MPEG)
MIDI Manufacturers Association
Independent JPEG Group's JPEG/GIF/PNG Source