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| Name | AVI | FLV |
| Full name | AVI - Microsoft Audio/Visual Interleaved | FLV - Flash Video |
| File extension | .avi | .flv, .f4v, .f4p, .f4a, .f4b |
| MIME type | video/vnd.avi, video/avi, video/msvideo, video/x-msvideo | video/x-flv |
| Developed by | Microsoft | Adobe Systems |
| Type of format | video file format | Media container |
| Description | Audio Video Interleaved (also Audio Video Interleave), known by its initials AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows software. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. | 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 | AVI is a derivative of the Resource Interchange File Format (RIFF), which divides a file's data into blocks, or "chunks." Each "chunk" is identified by a FourCC tag. An AVI file takes the form of a single chunk in a RIFF formatted file, which is then subdivided into two mandatory "chunks" and one optional "chunk". | 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. |
| File conversion | AVI conversion | FLV conversion |
| Associated programs | Windows Media Player, Windows Movie Maker, Avidemux, AviSynth, Adobe After Effects, Media Player Classic, VLC. | Adobe Flash Player |
| Wiki | https://en.wikipedia.org/wiki/Audio_Video_Interleave | https://en.wikipedia.org/wiki/Flash_Video |