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RealVideo is a proprietary video format developed by RealNetworks. It was first released in 1997 and as of 2006 is at version 10. RealVideo is supported on many platforms, including Windows, Mac, Linux, Solaris, and several mobile phones. Proprietary indicates that a party exercises private ownership, control or use over an item of property, usually to the exclusion of other parties. ...
RealNetworks NASDAQ: RNWK is a provider of Internet media delivery software and services based in Seattle, United States. ...
1997 (MCMXCVII) was a common year starting on Wednesday of the Gregorian calendar. ...
2006 is a common year starting on Sunday of the Gregorian calendar. ...
RealVideo is usually paired with RealAudio and packaged in a RealMedia (.rm) container. RealMedia is suitable for use as a streaming media format, that is one which 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 video in advance. RealAudio is a proprietary audio format developed by RealNetworks. ...
RealMedia is a multimedia container format created by RealNetworks. ...
Streaming media is media that is consumed (heard or viewed) (mostly in the form of clips) while it is being delivered. ...
Technology
The first version of RealVideo was announced in 1997 and was based on the H.263 codec. At the time, RealNetworks put out a press release saying they had licensed Iterated Systems' ClearVideo technology and were including it in RealVideo. However, support for ClearVideo quietly disappeared in the next version of RealVideo. H.263 is a video codec designed by the ITU-T as a low-bitrate encoding solution for videoconferencing. ...
A Codec is a device or program capable of performing encoding and decoding on a digital data stream or signal. ...
RealVideo continued to use H.263 until RealVideo 8, when the company switched to a proprietary video codec. RealVideo codecs are identified by four character codes. RV10 and RV20 are the H.263-based codecs. RV30 and RV40 are RealNetworks' proprietary formats. These identifiers have been the source of some confusion, as people may assume that RV10 is RealVideo version 10, when it is actually the first version of RealVideo. RealVideo 10 uses RV40. Proprietary indicates that a party exercises private ownership, control or use over an item of property, usually to the exclusion of other parties. ...
A video codec is a device or software module that enables the use of data compression for digital video. ...
A FOURCC (literally, four character code) is a sequence of four bytes used to uniquely identify data formats. ...
RealVideo can be played from a RealMedia file or streamed over the network using the Real Time Streaming Protocol (RTSP), a standard protocol for streaming media developed by the IETF. However, RealNetworks uses RTSP only to set up and manage the connection. The actual video data is sent with their own proprietary RDT protocol. This tactic has drawn criticism because it made it difficult to use RealVideo with other player and server software. However, the open source MPlayer project has now developed software capable of playing the RDT streams. The Real Time Streaming Protocol (RTSP), developed by the IETF and published in 1998 as RFC 2326, is a protocol for use in streaming media systems which allows a client to remotely control a streaming media server, issuing VCR-like commands such as play and pause, and allowing time-based...
The Internet Engineering Task Force (IETF) is charged with developing and promoting Internet standards. ...
RDT (Real Data Transport) is a transport protocol developed by RealNetworks in the 1990s. ...
Open source refers to projects that are open to the public and which draw on other projects that are freely available to the general public. ...
MPlayer is a free media player with support for more multimedia formats than any other media player. ...
To facilitate real-time streaming, RealVideo (and RealAudio) normally uses constant bit rate encoding, so that the same amount of data is sent over the network each second. Recently, RealNetworks has introduced a variable bit rate form called RealMedia Variable Bitrate (rmvb). This allows for better video quality, however this format is less suited for streaming because it is difficult to predict how much network capacity a certain video stream will need. Video with fast motion or rapidly changing scenes will require a higher bit rate. If the bit rate of a video stream increases significantly, it may exceed the speed at which data can be transmitted over the network, leading to an interruption in the video. Constant bit rate (CBR) is a term used in telecommunications, relating to the quality of service. ...
Variable bit rate (VBR) is a term used in telecommunications and computing that relates to sound or video quality. ...
RMVB is an abbreviation for RealMedia variable bitrate. ...
RealVideo Players The official player for RealVideo is RealNetworks RealPlayer, currently at version 10, and is available for various platforms including Windows, Macintosh, and Linux. RealPlayer has been quite controversial due to RealNetworks' reputation for invasive advertising and hard-sell tactics.[1] Some people refuse to use RealPlayer and have sought alternative means of playing RealVideo content. RealPlayer is a media player, created by RealNetworks, that plays a number of multimedia formats including MP3, MPEG-4, QuickTime, as well as multiple generations of proprietary RealAudio and RealVideo codecs. ...
Microsoft Windows is a family of operating systems by Microsoft. ...
The first Macintosh computer, introduced in 1984, upgraded to a 512K Fat Mac. The Macintosh or Mac, is a line of personal computers designed, developed, manufactured, and marketed by Apple Computer. ...
Linux (also known as GNU/Linux) is a Unix-like computer operating system. ...
Several other players exist, including MPlayer and Real Alternative. Many of these rely on the dynamically linked libraries (DLLs) from the official RealPlayer to play the video, and thus require RealPlayer to be installed (or at least its DLLs, if not the actual player). However, the open source ffmpeg library (and its DirectShow counterpart ffdshow) can play the older H.263 RealVideo and does not require RealPlayer or any parts thereof. MPlayer is a free media player with support for more multimedia formats than any other media player. ...
Real Alternative is a codec designed for playing RealMedia files, which normally require Real Player, with any video player. ...
In computer science, a library is a collection of subprograms used to develop software. ...
FFmpeg is a set of free computer programs that can record, convert and stream digital audio and video. ...
Logo of the DirectX Media SDK - the first time DirectShow was distributed under its current name. ...
ffdshow video decoder configuration ffdshow is an open source DirectShow and VfW codec for decoding/encoding many video and audio formats, including DivX and XviD movies using libavcodec, XviD and other open source libraries with a rich set of postprocessing filters. ...
RealNetworks has also developed the open source Helix player, however support for RealVideo in the Helix Project is limited because RealNetworks is still keeping the codecs proprietary. Helix is RealNetworks open source media framework. ...
RealPlayer does not record RealVideo streams, and RealNetworks has advertised this feature to content owners such as broadcasters, film studios, and music labels, as a means of discouraging users from illegally copying content. However, other software exists which can save the streams to files for later viewing. Such copying, known as time-shifting, is usually considered legal. Time shifting is the recording of television shows to some storage medium to be viewed at a time more convenient to the consumer. ...
External links - RealVideo 10 codec description
- Helix Community the open source project of all media framework of RealNetworks
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