Information about FLV file format

Name FLV
Full name FLV - Flash Video
File extension .flv, .f4v, .f4p, .f4a, .f4b
MIME type video/x-flv
Developed by Adobe Systems
Type of format Media container
Description Flash Video is a container file format used to deliver video over the Internet using Adobe Flash Player version 6 and newer. Flash Video content may also be embedded within SWF files. Flash Video used to be the de facto standard for web-based streaming video. Notable users of it include Hulu, VEVO, Yahoo! Video, metacafe, Reuters.com, and many other news providers.
Technical details There are two different video file formats known as Flash Video: FLV and F4V. The audio and video data within FLV files are encoded in the same manner as they are within SWF files. The F4V file format is based on the ISO base media file format and is starting with Flash Player 9 update 3. Both formats are supported in Adobe Flash Player and developed by Adobe Systems.
Associated programs Adobe Flash Player
Wiki https://en.wikipedia.org/wiki/Flash_Video