MP4 Full Form

What is the full form of MP4?

MPEG-4 Part 14 is referred to as MP4. A digital multimedia container format known as MPEG-4 Part 14 or MP4 is most frequently used to store video and audio. However, it can also store other data types like subtitles and still images. A compressed multimedia container format that includes music and video is called MPEG-4 (MP4) or MPEG-4 Part 14.

The Moving Picture Specialists Organization (MPEG), a working group of experts that established guidelines for the transmission and compression of audio and video, created MP4. Like the bulk of competitive container formats, it also supports online streaming. According to the specification, MPEG-4 Part 14 files only have the.mp4 filename extension. MPEG-4 Component 14 is a standard specified as a part of MPEG-4 (officially known as ISO/IEC 14496-14:2003).

In some advertisements, portable media players are called "MP4 players". On the other hand, some are merely MP3 players that can also play AMV or another video format; they do not necessarily support MPEG-4 Part 14.

Extensible Metadata Platform (XMP) metadata and metadata provided by the format specification are both permitted in MP4 files.

Specifications

Private streams enable most data to be incorporated in MPEG-4 Part 14 files. Streaming data is included in the file using a separate hint track. The MP4 Registration authority's website (mp4ra.org) publishes the registered codecs for MPEG-4 Part 12-based files, but only some of them are generally supported by MP4 players.

Codecs

The widely used codecs and other data streams are as follows:

• MPEG-H Part 2 (H.265/HEVC), MPEG-4 Part 10 (H.264/AVC), and MPEG-4 Part 2 are all video formats.

• MPEG-1 and MPEG-2 are other less popular compression formats.

• Audio: AAC, or Advanced Audio Coding

• Additionally, MPEG-4 Part 3 audio components include Text To Speech Interface (TTSI), Structured Audio Orchestra Language (SAL), Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MPEG-1 Audio Layer II (MP2), MP3, MPEG-1 Audio Layer I (MP1), CELP, and HVXC (speech) (SAOL).

• Apple Lossless, Opus, and Free Lossless Audio Codec (added in late 2018) are among other less popular compression formats.

• The Moov atom contains information related to video resolution, frame rates, orientation, display characteristics, and more. It might be placed at the beginning or end of the file. In the latter case, the video file is not playable if the file is incomplete or truncated.

Description

Information on frame rates, video resolution, orientation, display properties, and other details are all contained in the so-called Moov atom. It could be put at the start or end of the document. In the latter scenario, a video file that is missing or truncated cannot be played.

MP4 file format established some extensions over the ISO Base Media File Format. Other forms based on the ISO basic media file format also use some extensions (e.g. 3GP).

The official registration authority website publishes a list of all registered extensions for ISO Base Media File Format.

The registration authority in "MP4 Family" files for code points or identifier values is Apple Inc., and it is named in MPEG-4 Part 12 Annex D (informative). Designers for Codec should register the codes they produce, but the registration is unnecessary, and some invented and used code points need to be registered.

All previous specifications should be used as models, sources for terminology, and sources of technology when someone is developing a new specification derived from the ISO Base Media File Format.

A new definition shouldn't be created if an existing specification already describes how a specific media type is stored in the file format (for example, MPEG-4 audio or video in MP4).