Nippon Telegraph and Telephone

NTTNippon Telegraph and Telephone CorporationNTT East
(presently NTT DOCOMO) started operations. 1994 Basic Concept for the Coming Multimedia Age announced. 1995 NTT DATA listed on the Second Section of the Tokyo Stock Exchange. 1996 21st Century R&D Vision announced. 1996 NTT DATA listed on the First Section of the Tokyo Stock Exchange. 1997 Digitization of communications network in Japan completed. 1998 Global Information Sharing Concept announced. 1998 NTT DOCOMO listed on the First Section of the Tokyo Stock Exchange. 1999 NTT's operations reorganized into a holding-company structure: businesses transferred to three new wholly owned subsidiaries (NTT East, NTT West, and NTT Communications). 2002 prefecture-based subsidiaries of NTT East and


SnowLAV Filterslibavformat
FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the FFmpeg program itself, designed for command-line-based processing of video and audio files, and widely used for format transcoding, basic editing (trimming and concatenation), video scaling, video post-production effects, and standards compliance (SMPTE, ITU).


iPodsApple iPodiPod Touch
The iPod line can play several audio file formats including MP3, AAC/M4A, Protected AAC, AIFF, WAV, Audible audiobook, and Apple Lossless. The iPod Photo introduced the ability to display JPEG, BMP, GIF, TIFF, and PNG image file formats. Fifth- and sixth-generation iPod Classics, as well as third-generation iPod Nanos, can additionally play MPEG-4 (H.264/MPEG-4 AVC) and QuickTime video formats, with restrictions on video dimensions, encoding techniques and data rates. Originally, iPod software only worked with Classic Mac OS and macOS; iPod software for Microsoft Windows was launched with the second-generation model.

Adaptive differential pulse-code modulation

ADPCMAdaptive DPCMAdaptive Differential Pulse Code Modulation
The corresponding FFmpeg audio codecs are adpcm_ima_qt, adpcm_ima_wav, adpcm_ms, adpcm_swf and adpcm_yamaha.


Microsoft CorporationMicrosoft Corp.MS
The company also produces a wide range of other consumer and enterprise software for desktops, laptops, tabs, gadgets, and servers, including Internet search (with Bing), the digital services market (through MSN), mixed reality (HoloLens), cloud computing (Azure), and software development (Visual Studio). Steve Ballmer replaced Gates as CEO in 2000, and later envisioned a "devices and services" strategy.

Digital rights management

DRMDRM-freedigital restrictions management
All forms of DRM for audio and visual material (excluding interactive materials, e.g., videogames) are subject to the analog hole, namely that in order for a viewer to play the material, the digital signal must be turned into an analog signal containing light and/or sound for the viewer, and so available to be copied as no DRM is capable of controlling content in this form. In other words, a user could play a purchased audio file while using a separate program to record the sound back into the computer into a DRM-free file format.

Adaptive Transform Acoustic Coding

In a test conducted by an independent firm, but financed by Sony, it was concluded that ATRAC3plus at 64 kbit/s is equal in subjective sound quality to an obsolete MP3 encoder at 128 kbit/s. Performance against modern high quality MP3 encoders was not evaluated. ATRAC Advanced Lossless is a "scalable" lossless audio codec that records a lossy ATRAC3 or ATRAC3plus stream, and supplements it with a stream of correction information stored within the file itself that allows the original signal to be reproduced, if desired.

Windows Media Player

Windows Media Player 11Windows Media Player 12Windows Media Player Mobile
While previous versions streamed media to UPnP compliant devices (Digital Media Server role) and could play media by fetching it from a network share (Digital Media Player role), Windows Media Player 12 can access media from the shared media libraries on the network or HomeGroup, stream media to DLNA 1.5 compliant devices and allows itself (once the remote control option is turned on) to be remotely controlled by Digital Media Controller devices which stream media (Digital Media Renderer role).


MPC.mpcMusepack audio SV7 & SV8(MPC)
The Knife allows ripping Audio CD tracks directly into Musepack files. * Hydrogen Audio Wiki's article on Musepack subband selectable M/S encoding (as in AAC). Huffman coding (as in MP3 and AAC, but more efficient). Since SV8 the bitstream is compressed by highly optimized canonical huffman tables that yields 2% smaller files and faster decoding. noise substitution techniques (as in ATSC A-52 and MPEG-4 AAC V2). pure variable bitrate between 0 and 1300 kbit/s (when needed). Container-independent format. An SV8 MPC is a container file for a Musepack stream. Raw stream encoding is possible. Packetized stream allows muxing into audio and video containers (e.g. MKA/MKV, NUT).

ISO/IEC base media file format

ISO base media file formatMPEG-4 Part 12ISO BMFF
The first MP4 file format specification was created on the basis of the QuickTime format specification published in 2001. The MP4 file format known as "version 1" was published in 2001 as ISO/IEC 14496-1:2001, as revision of the MPEG-4 Part 1: Systems. In 2003, the first version of MP4 file format was revised and replaced by MPEG-4 Part 14: MP4 file format (ISO/IEC 14496-14:2003), commonly known as MPEG-4 file format "version 2". The MP4 file format was generalized into the ISO/IEC Base Media File format (ISO/IEC 14496-12:2004 or ISO/IEC 15444-12:2004), which defines a general structure for time-based media files.

Music download

Digital downloaddownloaddigital
Music downloads are typically encoded with modified discrete cosine transform (MDCT) audio data compression, particularly the Advanced Audio Coding (AAC) format used by iTunes as well as the MP3 audio coding format. Paid downloads are sometimes encoded with Digital Rights Management that restricts copying the music or playing purchased songs on certain digital audio players. They are almost always compressed using a lossy codec (usually MPEG-1 Layer 3, Windows Media, or AAC), which reduces file size and bandwidth requirements. These music resources have been created as a response to expanding technology and needs of customers that wanted easy, quick access to music.

HTTP Live Streaming

HLSApple HLSHLS adaptive bitrate streaming
Notable server implementations supporting HTTP Live Streaming include: HTTP Live Streaming is natively supported in the following operating systems: Server. Codify and encapsulate the input video flow in a proper format for the delivery. Then it is prepared for distribution by segmenting it into different files. In the process of intake, the video is encoded and segmented to generate video fragments and index file. Encoder: codify video files in H.264 format and audio in AAC, MP3, AC-3 or EC-3. This is encapsulated by MPEG-2 Transport Stream to carry it. Segmenter: divides the MPEG-2 TS file into fragments of equal length, kept as .ts files.


SHOUTcast DNAS is cross-platform proprietary software for streaming media over the Internet. The software, developed by Nullsoft, is available free of charge. It allows digital audio content, primarily in MP3 or High-Efficiency Advanced Audio Coding format, to be broadcast to and from media player software, enabling the creation of Internet radio "stations". The most common use of SHOUTcast is for creating or listening to Internet audio broadcasts; however, video streams exist as well. Some traditional radio stations use SHOUTcast to extend their presence onto the Web. SHOUTcast Radio is a related website which provides a directory of SHOUTcast stations.

Monkey's Audio

APE.apeMonkey's Audio (APE)
Monkey's Audio is an algorithm and file format for lossless audio data compression. Lossless data compression does not discard data during the process of encoding, unlike lossy compression methods such as AAC, MP3, Vorbis and Musepack. Data file compression is employed in order to reduce bandwidth, file transfer time, or storage requirements. A digital recording (such as a CD) encoded to the Monkey's Audio format can be decompressed into an identical copy of the original audio data.

HTML5 video

HTML5HTML 5 videoHTML5 tag
H.264 is usually used in the MP4 container format, together with Advanced Audio Coding (AAC) audio. AAC is also patented in itself, so users of MP4 will have to license both H.264 and AAC. In June 2009, the WHATWG concluded that no existing format was suitable as a specified requirement. Apple still only supports H.264, but Microsoft now supports VP9 and WebM, and has pledged support for AV1. On 30 October 2013, Cisco announced that it was making a binary H.264 module available for download. Cisco will pay the costs of patent licensing for those binary modules when downloaded by the using software while it is being installed, making H.264 free to use in that specific case.

MPEG-1 Audio Layer I

MP11MPEG-1/2 Layer-1
MPEG-1 Audio Layer I, commonly abbreviated to MP1, is one of three audio formats included in the MPEG-1 standard. It is a deliberately simplified version of MPEG-1 Audio Layer II, created for applications where lower compression efficiency could be tolerated in return for a less complex algorithm that could be executed with simpler hardware requirements. While supported by most media players, the codec is considered largely obsolete, and replaced by MP2 or MP3. For files only containing MP1 audio, the file extension .mp1 is used. MPEG-1 layer I was also used by the Digital Compact Cassette format, in the form of the PASC audio compression codec.


audiobooksaudio bookaudio books
Audiobooks are distributed on any audio format available, but primarily these are records, cassette tapes, CDs, MP3 CDs, downloadable digital formats (e.g., MP3 (.mp3), Windows Media Audio (.wma), Advanced Audio Coding (.aac)), and solid state preloaded digital devices in which the audio content is preloaded and sold together with a hardware device. In 1955, a German inventor introduced the Sound Book cassette system based on the Tefifon format where instead of a magnetic tape the sound was recorded on a continuous loop of grooved vinylite ribbon similar to the old 8-track tape.

Master Quality Authenticated

Master Quality Authenticated (MQA) is an audio codec using lossy compression and a form of file fingerprinting, intended for high fidelity digital audio internet streaming and file download. Launched in 2014 by Meridian Audio, it is now owned and licensed by MQA Ltd, which was founded by Bob Stuart, co-founder of Meridian Audio.

Flash Video

Specifically, Flash Player now supports video compressed in H.264 (MPEG-4 Part 10), audio compressed using AAC (MPEG-4 Part 3), the F4V, MP4 (MPEG-4 Part 14), M4V, M4A, 3GP and MOV multimedia container formats, 3GPP Timed Text specification (MPEG-4 Part 17) which is a standardized subtitle format and partial parsing support for the 'ilst' atom which is the ID3 equivalent iTunes uses to store metadata. MPEG-4 Part 2 video (e.g. created with DivX or Xvid) is not supported.

Adobe Flash

FlashMacromedia FlashFlash-based
Specifically, Flash Player will work with video compressed in H.264 (MPEG-4 Part 10), audio compressed using AAC (MPEG-4 Part 3), the F4V, MP4 (MPEG-4 Part 14), M4V, M4A, 3GP and MOV multimedia container formats, 3GPP Timed Text specification (MPEG-4 Part 17), which is a standardized subtitle format and partial parsing capability for the "ilst" atom, which is the ID3 equivalent iTunes uses to store metadata. MPEG-4 Part 2 and H.263 will not work in F4V file format. Adobe also announced that it will be gradually moving away from the FLV format to the standard ISO base media file format (MPEG-4 Part 12) owing to functional limits with the FLV structure when streaming H.264.


apt-XaptX-HDapt-X audio codec
In digital audio data reduction technology, aptX (formerly apt-X) is a family of proprietary audio codec compression algorithms owned by Qualcomm. The original aptX algorithm was developed in the 1980s by Dr.


Real Audio.ramRA
raac: MPEG-4 LC-AAC (RealAudio 9). racp: MPEG-4 HE-AAC (RealAudio 10). ralf: RealAudio Lossless Format (RealAudio 10). Comparison of audio coding formats. Icecast – a free and open source streaming server for internet radio stations, supports formats AAC, MP3, Ogg Vorbis, Theora, and NSV. SHOUTcast – a freeware server for internet radio stations, supports AAC, MP3, and NSV. Windows Media Audio – Microsoft's media formats. RealPlayer – Official media player for RealAudio. Helix Player is an open source media player for Linux, Solaris, and Symbian.

Logitech Media Server

SlimServerSqueezeCenterSqueezebox Server
Logitech Media Server (formerly SlimServer, SqueezeCenter and Squeezebox Server) is a streaming audio server supported by Logitech (formerly Slim Devices), developed in particular to support their Squeezebox range of digital audio receivers. The software is designed for streaming music over a network, allowing users to play their music collections from virtually anywhere there is an Internet connection. It supports audio formats including MP3, FLAC, WAV, Ogg, and AAC, as well as transcoding. It can stream to both software and hardware receivers, including the various Squeezebox models, as well as any media player capable of playing MP3 streams.

WMA Convert

WMA Convert is a software created for audio and video files conversion. The program supports conversion of MP3, M4A AAC, WAV, WMA audio file formats and MP4, WMV, AVI video formats. Also coverts M4P files to MP3. The option "convert directly to the iPod" is available. Software is capable with all most common audio file formats for portable media players. Removes DRM protection legally, because it is capable to bypass restriction using a unique audio and video converting mechanism. * Comparison of video converters. Audio compression (data). List of audio formats. List of music software.

Switch Audio File Conversion Software

FLAC, AAC, Ogg and other lossless formats were becoming more popular in the early 2000's, so Software such as Switch was needed to help users move audio files from one device to another and migrate old legacy audio formats into more efficient modern formats. The ability for a computer user to convert audio files becomes critical when they are unable to edit or use a particular audio file format due to limitations within their software or hardware platforms. Switch gives users the ability to convert WAV, MP3, WMA, M4A, Ogg, AVI, MID and most other audio file formats (40+ formats supported, see charts below).