MPEG-4 Part 14

MP4.mp4M4A.m4vM4B.m4aMPEG-4*.mp4.m4a/m4b/m4p/mp4/3g2.m4b
MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images.wikipedia
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FairPlay

.m4pAAC-DRMan open letter
MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store use the .m4p extension. iTunes Plus tracks, that the iTunes Store currently sells, are unencrypted and use .m4a accordingly.
FairPlay is a digital rights management (DRM) technology developed by Apple Inc. It is built into the MP4 multimedia file format as an encrypted AAC audio layer, and is used by the company to protect copyrighted works sold through iTunes Store, allowing only authorized devices to play the content.

MPEG-4

MPEG44MP4
The only official filename extension for MPEG-4 Part 14 files is .mp4. MPEG-4 Part 14 (formally ISO/IEC 14496-14:2003) is a standard specified as a part of MPEG-4.

3GP and 3G2

3GP.3gp3G2
It in turn is used as the basis for other file formats in the family (for example MP4, 3GP, Motion JPEG 2000).
3GP and 3G2 are container formats similar to MPEG-4 Part 14 (MP4), which is also based on MPEG-4 Part 12. The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements to accommodate mobile phones.

Motion JPEG 2000

It in turn is used as the basis for other file formats in the family (for example MP4, 3GP, Motion JPEG 2000).
Motion JPEG 2000 (MJ2 or MJP2) is a file format for motion sequences of JPEG 2000 images and associated audio, based on the MP4/QuickTime format.

Apple Lossless

ALAC.m4aApple Lossless Audio Codec
In response, Apple Inc. started using the .m4a filename extension for MP4 containers with audio data in the lossy Advanced Audio Coding (AAC) or its own Apple Lossless (ALAC) formats.
Apple Lossless data is frequently stored within an MP4 container with the filename extension .m4a.

QuickTime File Format

MOV.movQuickTime
MPEG-4 Part 14 is an instance of the more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon the QuickTime File Format.
In 2003, the first version of MP4 format was revised and replaced by MPEG-4 Part 14: MP4 file format (ISO/IEC 14496-14:2003).

ITunes Store

iTunesiTunes Music StoreiTunes U
MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store use the .m4p extension. iTunes Plus tracks, that the iTunes Store currently sells, are unencrypted and use .m4a accordingly.
FairPlay is built into the MP4 multimedia file format as an encrypted AAC audio layer, and is used by the company to protect copyrighted works sold through the store, allowing only authorized devices to play the content.

Portable media player

media playerdigital audio playersportable media players
Portable media players are sometimes advertised as "MP4 Players", although some are simply MP3 Players that also play AMV video or some other video format, and do not necessarily play the MPEG-4 Part 14 format.
The name itself is a misnomer, since most MP4 players through 2007 were incompatible with the MPEG-4 Part 14 or the .mp4 container format.

Advanced Audio Coding

AACAAC/AAC+/eAAC+.aac
In response, Apple Inc. started using the .m4a filename extension for MP4 containers with audio data in the lossy Advanced Audio Coding (AAC) or its own Apple Lossless (ALAC) formats.
In addition to the MP4, 3GP and other container formats based on ISO base media file format for file storage, AAC audio data was first packaged in a file for the MPEG-2 standard using Audio Data Interchange Format (ADIF), consisting of a single header followed by the raw AAC audio data blocks.

MPEG-4 Part 17

MPEG-4 Timed Text3GPP Timed TextMPEG-4 Part 17 Timed Text
Subtitles: MPEG-4 Timed Text (also known as 3GPP Timed Text).
It is mainly aimed for use in the .mp4 container, but can also be used in the .3gp container (as 3GPP Timed Text), which is technically almost identical with .mp4 but more used in cell phones.

Podcast

podcastspodcastingpodcaster
Audiobook and podcast files, which also contain metadata including chapter markers, images, and hyperlinks, can use the extension .m4a, but more commonly use the .m4b extension. An .m4a audio file cannot "bookmark" (remember the last listening spot), whereas .m4b extension files can.
Podguides are in the m4a format and can only be listened to through iTunes or an iPod.

Audio Lossless Coding

ALS
Also MPEG-4 Part 3 audio objects, such as Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MP3, MPEG-1 Audio Layer II (MP2), MPEG-1 Audio Layer I (MP1), CELP, HVXC (speech), TwinVQ, Text To Speech Interface (TTSI) and Structured Audio Orchestra Language (SAOL)
Optional storage in MP4 file format

Extensible Metadata Platform

XMPXMP metadataAdobe XMP
MP4 files can contain metadata as defined by the format standard, and in addition, can contain Extensible Metadata Platform (XMP) metadata.
XMP can be used in several file formats such as PDF, JPEG, JPEG 2000, JPEG XR, GIF, PNG, WebP, HTML, TIFF, Adobe Illustrator, PSD, MP3, MP4, Audio Video Interleave, WAV, RF64, Audio Interchange File Format, PostScript, Encapsulated PostScript, and proposed for DjVu.

ISO base media file format

ISO BMFFbase media formatISO-based
MPEG-4 Part 14 is an instance of the more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon the QuickTime File Format.
It is used as the basis for other media file formats (e.g. container formats MP4 and 3GP).

Nero Digital

NeroNero AAC CodecNero Digital Audio
Nero Digital uses DVD Video subtitles in MP4 files
Nero Digital can generate streams in the 3GP/MPEG-4 Part 14 (".mp4") container format and includes two video and two audio codecs:

Codec

codecsdecoderdecoders
The widely supported codecs and additional data streams are:
Some container formats which are ISO standards are MPEG transport stream, MPEG program stream, MP4 and ISO base media file format.

Comparison of video container formats

Comparison of (audio/video) container formatscontainer files
Comparison of (audio/video) container formats

MPEG-4 Part 3

AACAAC+ISO/IEC 14496-3
Also MPEG-4 Part 3 audio objects, such as Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MP3, MPEG-1 Audio Layer II (MP2), MPEG-1 Audio Layer I (MP1), CELP, HVXC (speech), TwinVQ, Text To Speech Interface (TTSI) and Structured Audio Orchestra Language (SAOL)
MPEG-4 Part 14 container format (MP4)

MPEG-1 Audio Layer II

MP22II
Also MPEG-4 Part 3 audio objects, such as Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MP3, MPEG-1 Audio Layer II (MP2), MPEG-1 Audio Layer I (MP1), CELP, HVXC (speech), TwinVQ, Text To Speech Interface (TTSI) and Structured Audio Orchestra Language (SAOL)
MP4 (container format)

MPEG-4 SLS

HD-AACScalable Lossless CodingMPEG-4 Scalable To Lossless (SLS)
Also MPEG-4 Part 3 audio objects, such as Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MP3, MPEG-1 Audio Layer II (MP2), MPEG-1 Audio Layer I (MP1), CELP, HVXC (speech), TwinVQ, Text To Speech Interface (TTSI) and Structured Audio Orchestra Language (SAOL)

MP3

.mp3MP3 downloadmp3s
Also MPEG-4 Part 3 audio objects, such as Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MP3, MPEG-1 Audio Layer II (MP2), MPEG-1 Audio Layer I (MP1), CELP, HVXC (speech), TwinVQ, Text To Speech Interface (TTSI) and Structured Audio Orchestra Language (SAOL)
MPEG-4 Part 14

Digital container format

container formatcontainercontainer formats
MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images.
MP4 (standard audio and video container for the MPEG-4 multimedia portfolio, based on the ISO base media file format defined in MPEG-4 Part 12 and JPEG 2000 Part 12) which in turn was based on the QuickTime file format.

Digital data

digitaldigital informationdigitally
MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images.

Multimedia

multi-mediamultimedia artistmultimedia art
MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images.

Digital video

videodigitalDV
MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images.