Music Player Daemon

Can be used as a source for an Icecast stream, in Ogg Vorbis and MP3. Other formats can be converted to Ogg/MP3 on the fly before output to the stream server. Built-in HTTP streaming server, capable of producing Ogg Vorbis and MP3 streams of a chosen quality on-the-fly. Independent of a GUI.

Free Studio

DVDVideoSoftDVDVideoSoft Free Studio
Input: .avi; .ivf; .div; .divx; .mpg; .mpeg; .mpe; .mp4; .m4v; .wmv; .asf; .webm; .mkv; .mov; .qt; .ts; .mts; .m2t; .m2ts; .mod; .tod; .vro; .dat; .3gp2; .3gpp; .3gp; .3g2; .dvr-ms; .flv; .f4v; .amv; .rm; .rmm; .rv; .rmvb; .ogv; DVD video Output: .mp4; .wmv; .avi; .mkv; .webm; .flv; .swf; .mov; .3gp; .m2ts; DVD video Input: .mp3 .wav; .aac; .m4a; .m4b; .wma; .ogg; .flac; .ra; .ram; .amr; .ape; .mka; .tta; .aiff; .au; .mpc; .spx; .ac3; audio cd Output: .mp3; .m4a; .aac; .wav; .wma; .ogg; .flac; .ape; audio CD Input: .jpg, .png, .bmp, .gif, .tga Output: .jpg, .png, .bmp, .gif, .tga, .pdf The programs have been tested and endorsed by Chip Online, Tucows, SnapFiles, Brothersoft and Softonic and have

Video file format

video filevideo filesvideo
A video file format is a type of file format for storing digital video data on a computer system. Video is almost always stored using lossy compression to reduce the file size. A video file normally consists of a container (e.g. in the Matroska format) containing video data in a video coding format (e.g. VP9) alongside audio data in an audio coding format (e.g. Opus). The container can also contain synchronization information, subtitles, and metadata such as title. A standardized (or in some cases de facto standard) video file type such as .webm is a profile specified by a restriction on which container format and which video and audio compression formats are allowed.

2000s in the music industry

A-la-carteadvancing state of music distributionchallenges for the record industry
As the International Federation of the Phonographic Industry (IFPI) notes: In 2003, music distribution formats were numbered in single figures – today, they number in the hundreds…In the digital era, record companies are licensing music across a multitude of platforms, in scores of different formats and with hundreds of different partners. Rise of MP3 players, which are consumer electronics devices that stores, organizes and plays audio files. Some DAPs (digital audio players) are also referred to as portable media players as they have image-viewing and/or video-playing support.


Regardless of the desktop media player, or the amount of storage capacity on a mobile phone, Didiom scanned a computer, and made the media collection available for wireless streaming and downloading to mobile phones. All streams were SSL encrypted for high-value transmissions, such as online banking transactions. Didiom's technology supported audio files in the format of DRM-free and DRM-protected Windows Media Audio (WMA), MP3, WAV, Advanced Audio Coding (AAC), M4A and Ogg Vorbis, as well as iTunes playlists, and playlists in Windows Media Player Playlist (WPL), PLS and M3U formats.

GPAC Project on Advanced Content

MP4 and 3GPP file reading (local & http). MP3 and AAC files (local & http) and HTTP streaming (ShoutCast/ICEcast radios). Most common media codecs for image, audio and video. Most common media containers. 3GPP Timed Text / MPEG-4 Streaming Text. MPEG-2 TS demultiplexer (local/UDP/RTP) with DVB support (Linux only). Streaming support through RTP/RTCP (unicast and multicast) and RTSP/SDP. Plugins for Mozilla (osmozilla, Win32 and Linux) and Internet Explorer (GPAX, Win32 and PPC 2003). MP4/3GP file RTP streamer (unicast and multicast). RTP streamer with service timeslicing (DVB-H) simulation. MPEG-2 TS broadcaster using MP4/3GP files or RTP streams as inputs.

Wowza Streaming Engine

Wowza Media ServerWowza
Supported file types include MP4 (QuickTime container - .mp4, .f4v, .mov, .m4a, .m4v, .mp4a, .mp4v, .3gp, and .3g2), FLV (Flash Video - .flv), and MP3 content (.mp3). * MPEG-DASH * 2007 Streaming Media Magazine Editors’ Pick. 2008 Streaming Media Magazine Editors’ Pick. 2008 Streaming Media Magazine US Readers’ Choice (Best Server). 2009 Streaming Media Magazine US Readers’ Choice (Best Server; Best Streaming Innovation). 2010 TV Technology Europe Magazine STAR Award. 2010 Streaming Media Magazine European Readers’ Choice Awards (Best Server; Best Innovation). 2010 WFX New Product Award (Best Overall New Media Product; Best Podcasting, Webcasting, and Website Streaming Media Solution). 2011 Streaming

Pono (digital music service)

PonoPonoMusicPono Music
Young claimed that Pono would provide "...the finest quality, highest-resolution digital music from ... major labels [as well as] prominent independent labels..." using the FLAC audio file format. On March 12, 2014 the company launched a successful crowdfunding campaign on Kickstarter that surpassed its target in one day. PonoMusic raised $6.2 million via pre-orders for the player by the end of the campaign. In June 2014, Young assumed the title of CEO of Pono Music. In August 2014, PonoMusic turned to Crowdfunder to raise more equity. They closed with a total financing of $4 million.

Media Foundation

Enhanced Video RendererMedia Foundation TransformEVR
In addition to Windows Media Audio and Windows Media Video encoders and decoders, and ASF file sink and file source introduced in Windows Vista, Windows 7 includes an H.264 encoder with Baseline profile level 3 and Main profile support and an AAC Low Complexity (AAC-LC) profile encoder For playback of various media formats, Windows 7 also introduces an H.264 decoder with Baseline, Main, and High-profile support, up to level 5.1, AAC-LC and HE-AAC v1 (SBR) multichannel, HE-AAC v2 (PS) stereo decoders, MPEG-4 Part 2 Simple Profile and Advanced Simple Profile decoders which includes decoding popular codec implementations such as DivX, Xvid and Nero Digital as well as MJPEG and DV MFT decoders for

HTML5 audio

Web AudioWeb Audio APIaudio
Most AAC files with finite length are wrapped in an MPEG-4 container (.mp4, .m4a), which is supported natively in Internet Explorer, Safari, and Chrome, and supported by the OS in Firefox and Opera. Most AAC live streams with infinite length are wrapped in an Audio Data Transport Stream container (.aac, .adts), which is supported by Chrome, Safari, Firefox and Edge. Many browsers also support uncompressed PCM audio in a WAVE container. In 2012, the free and open royalty-free Opus format was released and standardized by IETF. It is supported by Mozilla, Google, Opera and Edge. This table documents the current support for audio coding formats by the element.

Audio converter

For example, an audio transcoder converts from one compressed audio format to another (e.g., MP3 to AAC) by means of two audio codecs: One for decoding (uncompressing) the source and one for encoding (compressing) the destination file or stream. Audio file format. Comparison of audio coding formats. List of audio conversion software.

Comparison of audio player software

Comparison of media playersaudio playersaudio player
The following comparison of audio players compares general and technical information for a number of software media player programs. For the purpose of this comparison, "audio players" are defined as any media player explicitly designed to play audio files, with limited or no support for video playback. Multi-media players designed for video playback, which can also play music, are included under comparison of video player software. This section lists the operating systems on which the player works. There may be multiple versions of a player for different operating systems.

Speech coding

speech encodingspeech codecSpeech
Usually, speech coding and channel coding methods have to be chosen in pairs, with the more important bits in the speech data stream protected by more robust channel coding, in order to get the best overall coding results. The modified discrete cosine transform (MDCT), a type of discrete cosine transform (DCT) algorithm, was adapted into a speech coding algorithm called LD-MDCT, used for the AAC-LD format introduced in 1999. MDCT has since been widely adopted in voice-over-IP (VoIP) applications, such as the G.729.1 wideband audio codec introduced in 2006, Apple's Facetime (using AAC-LD) introduced in 2010, and the CELT codec introduced in 2011.


More recent testing has shown that MPEG Multichannel (based on MP2), despite being compromised by an inferior matrixed mode (for the sake of backwards compatibility) rates just slightly lower than much more recent audio codecs, such as Dolby Digital (AC-3) and Advanced Audio Coding (AAC) (mostly within the margin of error—and substantially superior in some cases, such as audience applause). This is one reason that MP2 audio continues to be used extensively. The MPEG-2 AAC Stereo verification tests reached a vastly different conclusion, however, showing AAC to provide superior performance to MP2 at half the bitrate.

History of telecommunication

History of telecommunicationsenormously increased speed of telecommunicationsprogress
The development of the modified discrete cosine transform (MDCT) algorithm led to the MP3 audio coding format in 1994, and the Advanced Audio Coding (AAC) format in 1999. Realization and demonstration, on 29 October 2001, of the first digital cinema transmission by satellite in Europe of a feature film by Bernard Pauchon, Alain Lorentz, Raymond Melwig and Philippe Binant.


Film.comReal NetworksRealNetworks, Inc.
ASCAP * RealAudio, a compressed audio format. RealDownloader, a download manager. RealPlayer, a media player. RealVideo, a compressed video format. Rinse, a digital music library cleanup tool. Unifi, a personal cloud media service. Mobile entertainment and messaging services for mobile carriers.


P2Ppeer to peerpeer-to-peer network
Some proprietary multimedia applications use a peer-to-peer network along with streaming servers to stream audio and video to their clients. Peercasting for multicasting streams. Pennsylvania State University, MIT and Simon Fraser University are carrying on a project called LionShare designed for facilitating file sharing among educational institutions globally. Osiris is a program that allows its users to create anonymous and autonomous web portals distributed via P2P network. Bitcoin and alternatives such as Ether, Nxt and Peercoin are peer-to-peer-based digital cryptocurrencies. Dalesa, a peer-to-peer web cache for LANs (based on IP multicasting). FAROO, a peer-to-peer web search engine.


Napster LiveFleemsterMP3 sharing
It was founded as a pioneering peer-to-peer (P2P) file sharing Internet software that emphasized sharing digital audio files, typically audio songs, encoded in MP3 format. As the software became popular, the company ran into legal difficulties over copyright infringement. It ceased operations and was eventually acquired by Roxio. In its second incarnation, Napster became an online music store until it was acquired by Rhapsody from Best Buy on December 1, 2011. Later, more decentralized projects followed Napster's P2P file-sharing example, such as Gnutella, Freenet, BearShare and Soulseek.

Variable bitrate

VBRvariable bit ratevariable
Support for VBR in AAC and MP3 files is found in most modern digital audio players, including those released by Apple, Microsoft, Creative Technology, and SanDisk. Early VBR algorithms occasionally introduced audible artifacts when encoding monotone or minimal tones (for example audiobooks and acoustic music). These artifacts often mimicked a "digital chirp" during the quiet portions of the song or when there was only speaking. As VBR encoding algorithms have improved, these problems have been resolved in subsequent generations of the VBR standard. Note that the choice of a variable bitrate (VBR) method only affects the encoding process.

Transform coding

transformtransform codectransform coder
In audio coding, MPEG audio compression analyzes the transformed data according to a psychoacoustic model that describes the human ear's sensitivity to parts of the signal, similar to the TV model. MP3 uses a hybrid coding algorithm, combining the modified discrete cosine transform (MDCT) and fast Fourier transform (FFT). It was succeeded by Advanced Audio Coding (AAC), which uses a pure MDCT algorithm to significantly improve compression efficiency. The basic process of digitizing an analog signal is a kind of transform coding that uses sampling in one or more domains as its transform. Karhunen–Loève theorem. Transformation (function). Wavelet transform.


The MPEG-4 Low Delay Audio Coder (a.k.a. AAC Low Delay, or AAC-LD) is audio compression standard designed to combine the advantages of perceptual audio coding with the low delay necessary for two-way communication. It is closely derived from the MPEG-2 Advanced Audio Coding (AAC) standard. It was published in MPEG-4 Audio Version 2 (ISO/IEC 14496-3:1999/Amd 1:2000) and in its later revisions. AAC-LD uses a version of the modified discrete cosine transform (MDCT) audio coding technique called the LD-MDCT. AAC-LD is widely used by Apple as the voice-over-IP (VoIP) speech codec in FaceTime.


onlinethe Internetweb
Podcasting is a variation on this theme, where – usually audio – material is downloaded and played back on a computer or shifted to a portable media player to be listened to on the move. These techniques using simple equipment allow anybody, with little censorship or licensing control, to broadcast audio-visual material worldwide. Digital media streaming increases the demand for network bandwidth. For example, standard image quality needs 1 Mbit/s link speed for SD 480p, HD 720p quality requires 2.5 Mbit/s, and the top-of-the-line HDX quality needs 4.5 Mbit/s for 1080p. Webcams are a low-cost extension of this phenomenon.

Linear predictive coding

LPClinear prediction coefficientsBlock Independent LPC
Linear predictive coding (LPC) is a method used mostly in audio signal processing and speech processing for representing the spectral envelope of a digital signal of speech in compressed form, using the information of a linear predictive model. It is one of the most powerful speech analysis techniques, and one of the most useful methods for encoding good quality speech at a low bit rate and provides highly accurate estimates of speech parameters. LPC is the most widely used method in speech coding and speech synthesis.

Lossless compression

losslesslossless data compressioncompression
Apple Lossless (ALAC – Apple Lossless Audio Codec). Adaptive Transform Acoustic Coding (ATRAC). Audio Lossless Coding (also known as MPEG-4 ALS). Direct Stream Transfer (DST). Dolby TrueHD. DTS-HD Master Audio. Free Lossless Audio Codec (FLAC). Meridian Lossless Packing (MLP). Monkey's Audio (Monkey's Audio APE). MPEG-4 SLS (also known as HD-AAC). OptimFROG. Original Sound Quality (OSQ). RealPlayer (RealAudio Lossless). Shorten (SHN). TTA (True Audio Lossless). WavPack (WavPack lossless). WMA Lossless (Windows Media Lossless). HEIF – High Efficiency Image File Format (lossless or lossy compression, using HEVC). ILBM – (lossless RLE compression of Amiga IFF images).

Compact disc

CDCDsCD single
Monaural audio has no existing standard on a Red Book CD; thus, mono source material is usually presented as two identical channels in a standard Red Book stereo track (i.e., mirrored mono); an MP3 CD, however, can have audio file formats with mono sound. CD-Text is an extension of the Red Book specification for audio CD that allows for storage of additional text information (e.g., album name, song name, artist) on a standards-compliant audio CD. The information is stored either in the lead-in area of the CD, where there is roughly five kilobytes of space available, or in the subcode channels R to W on the disc, which can store about 31 megabytes.