MPEG4 Video Format

What is MPEG4 video format? MPEG4 video format is the video format with MPEG4 codec. MPEG4 is an ISO/IEC standard developed by MPEG (Moving Picture Experts Group), the committee that also developed the Emmy Award winning standards known as MPEG-1 and MPEG-2. These standards made interactive video on CD-ROM and Digital Television possible. MPEG4 is the result of another international effort involving hundreds of researchers and engineers from all over the world. MPEG4, whose formal ISO/IEC designation is ISO/IEC 14496, was finalized in October 1998 and became an International Standard in the first months of 1999. The fully backward compatible extensions under the title of MPEG4 Version 2 were frozen at the end of 1999, to acquire the formal International Standard Status early in 2000. Some work, on extensions in specific domains, is still in progress.

MPEG4 video format absorbs many of the features of MPEG-1 and MPEG-2 and other related standards, adding new features such as (extended) VRML support for 3D rendering, object-oriented composite files (including audio, video and VRML objects), support for externally-specified Digital Rights Management and various types of interactivity. AAC (Advanced Audio Codec) was standardized as an adjunct to MPEG-2 (as Part 7) before MPEG4 was issued.

MPEG4 is still a developing standard and is divided into a number of parts. Companies promoting MPEG4 compatibility do not always clearly state which part level compatibility they are referring to. The key parts to be aware of are MPEG4 part 2 (including Advanced Simple Profile, used by codecs such as DivX, Xvid, Nero Digital and 3ivx and by Quicktime 6) and MPEG4 part 10 (MPEG4 AVC/H.264 or Advanced Video Coding, used by the x264 codec, by Nero Digital AVC, by Quicktime 7, and by next-gen video medium formats like Blu-ray Disc).

Most of the features included in MPEG4 video file formats are left to individual developers to decide whether to implement them. This means that there are probably no complete implementations of the entire MPEG4 set of standards. To deal with this, the standard includes the concept of profiles and levels, allowing a specific set of capabilities to be defined in a manner appropriate for a subset of applications.

Initially, MPEG4 was aimed primarily at low bit-rate video communications; however, its scope as a multimedia coding standard was later expanded. MPEG4 video format is efficient across a variety of bit-rates ranging from a few kilobits per second to tens of megabits per second. MPEG4 provides the following functionalities:

Improved coding efficiency
Ability to encode mixed media data (video, audio, speech)
Error resilience to enable robust transmission
Ability to interact with the audio-visual scene generated at the receiver

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