That is the case with some video file formats, such as WebM (.webm), Windows Media Video (.wmv), Flash Video (.flv), and Ogg Video (.ogv), each of which can only contain a few well-defined subtypes of video and audio coding formats, making it relatively easy to know which codec will play the file. Good design normally dictates that a file extension enables the user to derive which program will open the file from the file extension. A program (or hardware) which can decode compressed video or audio is called a codec playing or encoding a video file will sometimes require the user to install a codec library corresponding to the type of video and audio coding used in the file. not headers, footers, and metadata) is called the essence. The coded video and audio inside a video file container (i.e. webm is a profile specified by a restriction on which container format and which video and audio compression formats are allowed. A standardized (or in some cases de facto standard) video file type such as. The container can also contain synchronization information, subtitles, and metadata such as title. VP9) alongside audio data in an audio coding format (e.g. in the Matroska format) containing video data in a video coding format (e.g. Video is almost always stored using lossy compression to reduce the file size.Ī video file normally consists of a container (e.g.
File format for storing digital video dataĪ video file format is a type of file format for storing digital video data on a computer system.
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