Editing MPEG-4 Part 3 (section)

== Audio storage and transport ==
{| class="wikitable sortable" width="100%"
|+Multiplex, storage and transmission formats for MPEG-4 Audio<ref name="mpeg4audio-version4-2009" />
|-
! width="10%" |
! width="20%" | Standard
! width="50%" | Description
|-
| Multiplex
| ISO/IEC 14496-1
| MPEG-4 Multiplex scheme (M4Mux)<ref>{{citation|url=http://webstore.iec.ch/preview/info_isoiec14496-1{ed3.0}en.pdf |title=ISO/IEC 14496-1, Third edition 2004-11-15, Part 1: Systems |author=ISO |publisher=ISO |date=2004-11-15 |access-date=2009-10-14 |url-status=dead |archive-url=https://web.archive.org/web/20110614010701/http://webstore.iec.ch/preview/info_isoiec14496-1%7Bed3.0%7Den.pdf |archive-date=June 14, 2011 }}</ref>
|-
| Multiplex
| ISO/IEC 14496-3
| Low Overhead Audio Transport Multiplex (LATM)
|-
| Storage
| ISO/IEC 14496-3 (informative)
| Audio Data Interchange Format (ADIF) – only for AAC
|-
| Storage
| ISO/IEC 14496-12
| MPEG-4 file format ([[MPEG-4 Part 14|MP4]]) / [[ISO base media file format]]
|-
| Transmission
| ISO/IEC 14496-3 (informative)
| Audio Data Transport Stream (ADTS) – only for AAC
|-
| Transmission
| ISO/IEC 14496-3
| Low Overhead Audio Stream (LOAS), based on LATM
|}

There is no standard for transport of [[elementary stream]]s over a channel, because the broad range of MPEG-4 applications have delivery requirements that are too wide to easily characterize with a single solution.

The capabilities of a transport layer and the communication between transport, multiplex, and demultiplex functions are described in the [[Delivery Multimedia Integration Framework]] (DMIF) in ISO/IEC 14496-6.<ref name="mpeg4audio-version4-2009" /> A wide variety of delivery mechanisms exist below this interface, e.g., [[MPEG transport stream]], [[Real-time Transport Protocol]] (RTP), etc.

Transport in Real-time Transport Protocol is defined in RFC 3016 (RTP Payload Format for MPEG-4 Audio/Visual Streams), RFC 3640 (RTP Payload Format for Transport of MPEG-4 Elementary Streams), RFC 4281 (The Codecs Parameter for "Bucket" Media Types) and RFC 4337 (MIME Type Registration for MPEG-4).

LATM and LOAS were defined for natural audio applications, which do not require sophisticated object-based coding or other functions provided by MPEG-4 Systems.