FLV Video Format

What is FLV video format? FLV video format is proprietary file format used to deliver video over the Internet using Adobe Flash Player (formerly known as Macromedia Flash Player) version 6, 7, 8, or 9. FLV video file formats contain video and audio streams as well as metadata. FLV video format may also be embedded within SWF files. Notable users of the FLV video format include YouTube, Google Video, Reuters.com, Yahoo! Video and MySpace.

FLV video format were originally developed and supported by Macromedia, now Adobe, though details of FLV video format are available for other developers to use, hence its widespread use on video streaming websites. FLV video format is an open format that is also supported by non-Adobe/Macromedia programs; FLV video file formats may be exported from QuickTime Pro or other applications that can export to the QuickTime file format. FLV video format gained a huge success and wide spread popularity because it featured many advantages for delivering a live streaming video on internet.

FLV video format can be delivered in several ways. FLV video format can be delivered as a standalone .FLV file. Also, FLV video format can be embedded in an SWF file using the Flash authoring tool . The entire file must be transferred before playback can begin. Changing the video requires rebuilding the SWF file. The third way to deliver FLV video file formats is through progressive download via HTTP. This method uses Action Script to include an externally hosted FLV file client-side for playback. More than the three ways, FLV video format can be delivered through streamed via RTMP to the Flash Player using the Flash Media Server , VCS or the open source Red5 server.

A number of applications can be used to open FLV video format, including Adobe Flash Player, a freely available FLV video player, MPlayer, VLC Media Player and Quicktime. Other applications such as Windows Media Player can also be used to play FLV video file formats if the ffdshow codec is installed. FLV video format can also be opened by web browsers which have the Adobe Flash plug-in installed. FLV video format is becoming more popular on the web since it can easily be embedded in a webpage and is supported by most operating systems via the Adobe Flash Player and web-browser plugin.

The standard video codecs that FLV video format uses are H.263, H.264, VP6 and Mpeg4. Commonly FLV video file formats contain video bit streams which are a variant of the H.263 video standard, under the name of Sorenson Spark. Flash Player 8 and newer revisions support the playback of On2 TrueMotion VP6 video bit streams. On2 VP6 can provide a higher visual quality than Sorenson Spark, especially when using lower bit rates. FLV video format supports two versions of a so called screenshare Codec which is an encoding format designed for screencasts. Both these formats are bitmap tile based, can be lossy by reducing color depths and are compressed using zlib. The second version is only playable in Flash Player 8 and newer.

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