What is mkv?
The MKV extension, short for Mastroska Video, is a video stream file created by Matroska Association. The Matroska Association created multiple multimedia container formats from a project called MCF. The MKV extension is related to the MKA extension, but differs in a way that it can contain both audio, video and subtitle tracks, whereas MKA only streams audio.
What is f4v?
The F4V file is a video container file associated with Adobe Flash. This Flash MP4 video file is similar to FLV files, but uses ‘boxes’ to store its data. Examples of boxes supported by the F4V format are the ftyp box (player requirements), the moov box (file header), the mvhd box (playback information), the trak box (media tracks), the uda box (free-form user data) and the meta box (metadata).
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