Flash Video - Wikipedia, the free encyclopedia. Flash Video. Filename extension. Internet media typevideo/x- flv, video/mp. Developed by. Adobe Systems (originally developed by Macromedia)Type of format. Media container. Container for.
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Audio, video, text, data. Extended from. FLV: SWFF4. V: MPEG- 4 Part 1.
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Flash Video is a container file format used to deliver digital video content (e. TV shows, movies, etc.) over the Internet using Adobe Flash Player version 6 and newer. Flash Video content may also be embedded within SWF files. There are two different video file formats known as Flash Video: FLV and F4.
V. The audio and video data within FLV files are encoded in the same manner as they are within SWF files. The F4. V file format is based on the ISO base media file format and is starting with Flash Player 9 update 3. FLV was originally developed by Macromedia. In the early 2. 00. Flash Video used to be the de facto standard for web- based streaming video (over RTMP). Notable users of it include Hulu, VEVO, Yahoo! Programming Ruby 1.9 & 2.0 Download.
Video, metacafe, Reuters. Flash Video FLV files usually contain material encoded with codecs following the Sorenson Spark or VP6video compression formats. The most recent public releases of Flash Player (collaboration between Adobe Systems and Main. Concept) also support H. HE- AAC audio. Flash Video is viewable on most operating systems via the Adobe Flash Player and web browserplugin or one of several third- party programs. Apple's i. OS devices, along with almost all other mobile devices, do not support the Flash Player plugin and so require other delivery methods such as provided by the Adobe Flash Media Server. In 2. 00. 3, Flash Player 7 added direct support for FLV file format.
Because of restrictions in the FLV file format, Adobe Systems has created in 2. ISO base media file format (MPEG- 4 Part 1. Flash Player does not check the extension of the file, but rather looks inside the file to detect which format it is.
For example, F4. V does not support Screen video, Sorenson Spark, VP6 video compression formats and ADPCM, Nellymoser audio compression formats. There are functional limits with the FLV structure when streaming H.
AAC which could not be overcome without a redesign of the file format. This is one reason why Adobe Systems is moving away from the traditional FLV file structure. Adobe branded file suffixes exist for . Adobe Access DRM scheme with . MIME derived Internet media type of audio/mp.
SWF files published for Flash Player 6 and later versions are able to exchange audio, video, and data over RTMP connections with the Adobe Flash Media Server. One way to feed data to Flash Media Server is from files in the FLV file format. Starting with SWF files created for Flash Player 7, Flash Player can play FLV file format directly (MIME type video/x- flv). Starting with SWF files created for Flash Player 9 Update 3, Flash Player can also play the new F4.
V file format. On. VP6 is the preferred video compression format for use with Flash Player 8 and higher. On the other hand, it is computationally more complex and therefore will not run as well on certain older system configurations. 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. Audio in Flash Video files is usually encoded as MP3.
However, audio in Flash Video FLV files recorded from the user's microphone use the proprietary Nellymoser Asao Codec. Recent versions of Flash Player 9 support AAC (HE- AAC/AACSBR, AAC Main Profile, and AAC- LC).
Support for encoding Flash Video files is provided by an encoding tool included with Adobe's Flash Professional and Creative Suite products, On. Flix encoding tools, Sorenson Squeeze, FFmpeg and other third party tools.
Media type support. Below is a list of popular free video converters which support conversion to FLV. These programs run under Microsoft Windows. Hand. Brake, FFmpeg and VLC also run under Mac OS X and Linux.
Flash Video Structure. The first four bytes denote the size of the previous packet/tag (including the header), and aid in seeking backward. Field. Data Type. Default. Details.
Size of previous packetuint. The third bit indicates the payload is encrypted using the same mechanism as RTMP uses, however this is rarely used due to encrypted transports such as RTMP being used instead. The FLV packet encryption is generally inherited from a MP4 file that is stored on a Adobe Flash Media Server.
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