FLV

More Knowledge about FLV

FLV (Flash Video) is a 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 content may also be embedded within SWF files. Notable users of the FLV format include YouTube, Google Video, Reuters.com, Yahoo! Video and MySpace.

Flash Video is viewable on most operating systems, via the widely available Adobe Flash Player and web browser plugin, or one of several third-party programs such as Media Player Classic (with the ffdshow codecs installed), MPlayer, or VLC media player.

The Adobe Flash Player is a multimedia and application player created and distributed by Adobe. It plays SWF files which can be created by the Adobe Flash Authoring tool, Adobe Flex or a number of other Adobe and third party tools. It has support for a programming language called ActionScript, which can be used to display Flash Video from an SWF file. Because the Flash Player runs as a browser plug-in, it is possible to embed Flash Video in web pages and view the video within a web browser.

Commonly FLV files 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. On the other hand it is computationally more complex and therefore will not run as well on certain older system configurations.

An optional alpha channel which represents per pixel transparency is supported by including a second simultaneous video stream which encodes the alpha channel only, dropping any chromatic information. The implementation makes the assumption that the YUV data of the main On2 VP6 video stream is always converted to RGB by the client before compositing occurs as the resulting RGB values are alpha premultiplied and clamped accordingly. This option is only available for On2 VP6 encoded video streams.

The FLV file 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.

Support for encoding FLV files is provided by an encoding tool included with Adobe's Macromedia Flash Professional 8 product, On2's Flix encoding tools, Sorenson Squeeze, FFmpeg and other third party tools.

Audio in FLV files is usually encoded as MP3. However, FLV files recorded from the user's microphone use the proprietary Nellymoser codec. There is currently no open source product available that can Decode the nellymoser codec. FLV files also support uncompressed audio or ADPCM format audio.

How to Convert DVD to FLV?

Believing it or not, best movie resources are still from your DVD collections. Besides watching movies on TV with DVD player, sometimes you may also want to enjoy the films with iPod, iPad, PSP, or PC players; sometimes you may want to back up a special disc; sometimes you want to upload DVD disc content to YouTube but just find only FLV files are accepted...At this moment, you do need to rip DVD to video in common formats. On the other hand, DVD discs takes some space while converting DVD to videos to store the movies on PC will save your space. Needless to say, backing up DVD disc and making DVD copy are necessary to ensure never losing those important data.

The following guide will tell you exactly how to rip and convert DVD movies to video in desired format, like ripping DVD to FLV/AVI/MP4, step by step.

First, it is necessary to install the software: DVD Converter;
Secondly, you should have a DVD disc in your driver or DVD folder in your PC;
Last, make sure your PC has enough free space in a hard disk for saving temporary files.

Step 1: Add DVD Movie to DVD Converter

Launch DVD Converter. Click button “Open DVD” to open a DVD disc (DVD-5 or DVD-9) in your driver or a DVD folder (containing VOB files) in your PC.

Step 2: Specify DVD to Video/Audio Conversion

After DVD titles are all listed in the program, you may go to General Settings or Advanced Settings panel to specify your conversion. Click the drop down arrow under "Target profile" and select a profile from the list. It lists kinds of DVD to video/audio conversion pre-sets, which are specified different dimension, bit rate, codec, file size and so on.

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Step 3: Rip DVD

Click button "Rip DVD" on the top of the tool bar to start DVD to video/audio conversion.

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