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| Name | MKV | FLV |
| Full name | MKV - Matroska | FLV - Flash Video |
| File extension | .mkv, .mk3d, .mka, .mks | .flv, .f4v, .f4p, .f4a, .f4b |
| MIME type | video/x-matroska, audio/x-matroska | video/x-flv |
| Developed by | www.matroska.org | Adobe Systems |
| Type of format | Container format | Media container |
| Description | The Matroska Multimedia Container is an open standard free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is intended to serve as a universal format for storing common multimedia content, like movies or TV shows. | 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 | Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF), but is entirely open in specification, with implementations consisting mostly of open source software. | 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 | VLC Media Player | Adobe Flash Player |
| Wiki | https://en.wikipedia.org/wiki/Matroska | https://en.wikipedia.org/wiki/Flash_Video |