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RealMedia
RealMedia is a proprietary multimedia container format (digital), container format created by RealNetworks with the filename extension . RealMedia is used in conjunction with RealVideo and RealAudio, while also being used for Streaming media, streaming content over the Internet. Typically these streams are in CBR (constant bitrate), but a container for VBR (variable bitrate) streams named RMVB (RealMedia variable bitrate) has been developed. Overview A RealMedia file consists of a series of chunks that can be of several different types: * ''.RMF'': RealMedia file header * ''PROP'': File properties header * ''MDPR'': Media properties header * ''CONT'': Content description header * ''DATA'': Data header * ''INDX'': Index header Supported audio formats * RealAudio 1.0 (VSELP), * RealAudio 2.0 (LD-CELP), 28_8 * Dolby AC-3, AC3, * Sipro, * cook Codec, cook, cook * ATRAC, ATRAC3, * RealAudio Lossless Format, * LC-AAC, * HE-AAC, Supported video formats * ClearVideo (fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RealVideo
RealVideo, also spelled as Real Video, is a suite of proprietary format, proprietary video compression formats developed by RealNetworks — the specific format changes with the version. It was first released in 1997 and was at version 15. RealVideo is supported on many platforms, including Microsoft Windows, Windows, MacOS, Mac, Linux, Solaris, and several mobile phones. RealVideo is usually paired with RealAudio and packaged in a RealMedia (.rm) container. RealMedia is suitable for use as a streaming media format, that one is viewed while it is being sent over the network. Streaming video can be used to watch live television since it does not require downloading the entire video in advance. Technology The first version of RealVideo was announced in 1997 and was based on the H.263 format. At the time, RealNetworks issued a press release saying they had licensed Iterated Systems' ClearVideo technology and were including it as the RealVideo Fractal Codec. However, support for Cle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RMVB
RealMedia Variable Bitrate (RMVB) is a variable bitrate extension of the RealMedia multimedia digital container format developed by RealNetworks. As opposed to the more common RealMedia container, which holds streaming media encoded at a constant bitrate (CBR), RMVB is typically used for multimedia content stored locally. Files using this format have the file extension ".rmvb". Details RealMedia uses compression similar to MPEG-4 Part 10 encoders such as x264. RMVB files are popular for distributing Asian content, especially Chinese television episodes and movies. For this reason, they have become noticeably present (though not entirely popular, partly due to their incompatibility with other media players) on file sharing platforms such as BitTorrent, eDonkey and Gnutella. On the Windows platform, the proprietary RealPlayer SP (RealPlayer 10 and later) and the open-sourced Media Player Classic support RMVB, using an appropriate DirectShow filter or Real Alternative. On Linux a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RealPlayer
RealPlayer, formerly RealAudio Player, RealOne Player and RealPlayer G2, is a cross-platform media player (software), media player app, developed by RealNetworks. The media player is compatible with numerous container file formats of the multimedia realm, including MP3, MP4, QuickTime File Format, Advanced Systems Format, Windows Media format, and the Proprietary format, proprietary RealAudio and RealVideo formats. RealPlayer is also available for other operating systems; Linux, Unix, Palm OS, Windows Mobile, and Symbian versions have been released. The program is powered by an underlying open-source software, open-source media engine called Helix (multimedia project), Helix. History The first version of RealPlayer was introduced on April 3, 1995 as "RealAudio Player" and was one of the first media players capable of streaming media over the Internet. Then, version 4.01 of RealPlayer was included as a selectable Internet tool in Windows 98's installation package. Subsequent ver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of Video Container Formats
These tables compare features of multimedia container format (digital), container formats, most often used for storing or streaming digital video or digital audio content. To see which multimedia players support which container format, look at comparison of video player software, comparison of media players. General information In many ways, derived containers are similar to those on which they are based, sometimes extending them, sometimes limiting their capabilities. * QuickTime File Format, QTFF ** ISO base media file format, ISO BMFF *** MPEG-4 Part 14, MP4 *** 3GP and 3G2, 3GPP, 3GPP2 *** Flash Video, F4V * MPEG program stream, MPEG-PS ** MPEG transport stream, MPEG-TS *** .m2ts, M2TS ** VOB *** Enhanced VOB, EVOB * Multimedia Container Format, MCF ** Matroska *** WebM * Resource Interchange File Format, RIFF ** Audio Video Interleave, AVI *** DivX Media Format, DMF * RealMedia, RM ** RMVB Support level legend: Some features are only supported by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RealAudio
RealAudio, also spelled Real Audio, is a proprietary audio format developed by RealNetworks and first released in April 1995. It uses a variety of audio codecs, ranging from low-bitrate formats that can be used over dialup modems, to high-fidelity formats for music. It can be used as a streaming audio format, that is played at the same time as it is downloaded. In the past, many internet radio stations used RealAudio to stream their programming over the internet in real time. In recent years, however, the format has become less common and has given way to more popular audio formats. RealAudio was heavily used by the BBC websites until 2009, though it was discontinued due to its declining use. BBC World Service, the last of the BBC websites to use RealAudio, discontinued its use in March 2011. File extensions RealAudio files were originally identified by a filename extension of .ra (for Real Audio). In 1997, RealNetworks also began offering a video format called RealVideo. The com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Container Format (digital)
A container format (informally, sometimes called a wrapper) or metafile is a file format that allows multiple data streams to be embedded into a single computer file, file, usually along with metadata for identifying and further detailing those streams. Notable examples of container formats include archive files (such as the ZIP (file format), ZIP format) and formats used for multimedia playback (such as Matroska, MPEG-4 Part 14, MP4, and Audio Video Interleave, AVI). Among the earliest cross-platform container formats were Distinguished Encoding Rules and the 1985 Interchange File Format. Design Although containers may identify how data or metadata is encoded, they do not actually provide instructions about how to decode that data. A Computer program, program that can open a container must also use an appropriate codec to decode its contents. If the program doesn't have the required algorithm, it can't use the contained data. In these cases, programs usually emit an error mess ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helix (project)
Helix DNA was a project to produce computer software that can play audio and video media in various formats and aid in creating such media. It was intended as a largely free and open-source digital media framework compatible with numerous operating systems and processors (including mobile phones) and it was started by RealNetworks, which contributed much of the code. The Helix Community was an open collaborative effort to develop and extend the Helix DNA platform. The Helix Project has been discontinued. Helix DNA Client is a software package for multi-platform, multi-format media playback. Helix Player is a media player compatible with Linux, Solaris, Symbian, and FreeBSD and uses the Helix DNA Client. The Helix DNA Producer application aids in producing media files, and Helix DNA Server can stream media files over a network. Licenses The code is released in binary and source code form under various licenses, notably the proprietary RealNetworks Community Source License and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Container Format (digital)
A container format (informally, sometimes called a wrapper) or metafile is a file format that allows multiple data streams to be embedded into a single computer file, file, usually along with metadata for identifying and further detailing those streams. Notable examples of container formats include archive files (such as the ZIP (file format), ZIP format) and formats used for multimedia playback (such as Matroska, MPEG-4 Part 14, MP4, and Audio Video Interleave, AVI). Among the earliest cross-platform container formats were Distinguished Encoding Rules and the 1985 Interchange File Format. Design Although containers may identify how data or metadata is encoded, they do not actually provide instructions about how to decode that data. A Computer program, program that can open a container must also use an appropriate codec to decode its contents. If the program doesn't have the required algorithm, it can't use the contained data. In these cases, programs usually emit an error mess ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of Video Player Software
The following comparison of video players compares general and technical information for notable software media player programs. For the purpose of this comparison, ''video players'' are defined as any media player which can play video, even if it can also play audio files. General Active players Inactive players Operating system compatibility This section lists the operating systems on which the player works. There may be multiple versions of a player, each one for a given operating system. Features Extended features Consumer video format ability Information about what video formats the players understand. Footnotes lead to information about abilities of future versions of the players or plugins/filters that provide such abilities. Production video format ability Audio format ability Information about what audio formats the players understand. Footnotes lead to information about abilities of future versions of the players or plugins/filters that pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Container Format
A container format (informally, sometimes called a wrapper) or metafile is a file format that allows multiple data streams to be embedded into a single file, usually along with metadata for identifying and further detailing those streams. Notable examples of container formats include archive files (such as the ZIP format) and formats used for multimedia playback (such as Matroska, MP4, and AVI). Among the earliest cross-platform container formats were Distinguished Encoding Rules and the 1985 Interchange File Format. Design Although containers may identify how data or metadata is encoded, they do not actually provide instructions about how to decode that data. A program that can open a container must also use an appropriate codec to decode its contents. If the program doesn't have the required algorithm, it can't use the contained data. In these cases, programs usually emit an error message that complains of a missing codec, which users may be able to acquire. Container ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RealNetworks
RealNetworks LLC is an American technology company and provider of Internet streaming media delivery software and services based in Seattle, Washington. The company also provides subscription-based online entertainment services and mobile entertainment and messaging services. History RealNetworks (then known as Progressive Networks) was founded in 1994 by Rob Glaser, an ex-Microsoft executive, and a management team including Phil Barrett, Andy Sharpless, and Stephen Buerkle. The original goal of the company was to provide a distribution channel for politically progressive content. It evolved into a technology venture to leverage the Internet as an alternative distribution medium for audio broadcasts. Progressive Networks became RealNetworks in September 1997, in advance of the company's initial public offering (IPO) in October 1997 when shares of the company started trading on Nasdaq as "RNWK". RealNetworks were pioneers in the streaming media markets and broadcast one of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple Inc
Apple Inc. is an American multinational corporation and technology company headquartered in Cupertino, California, in Silicon Valley. It is best known for its consumer electronics, software, and services. Founded in 1976 as Apple Computer Company by Steve Jobs, Steve Wozniak and Ronald Wayne, the company was incorporated by Jobs and Wozniak as Apple Computer, Inc. the following year. It was renamed Apple Inc. in 2007 as the company had expanded its focus from computers to consumer electronics. Apple is the largest technology company by revenue, with billion in the 2024 fiscal year. The company was founded to produce and market Wozniak's Apple I personal computer. Its second computer, the Apple II, became a best seller as one of the first mass-produced microcomputers. Apple introduced the Lisa in 1983 and the Macintosh in 1984, as some of the first computers to use a graphical user interface and a mouse. By 1985, internal company problems led to Jobs leavin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
