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WebM is an audiovisual media file format. [5] It is primarily intended to offer a royalty-free alternative to use in the HTML video and the HTML audio elements. It has a sister project, WebP , for images.
Basic: The Basic edition is the smallest version and enables a Microsoft Windows computer to play the contents of AVI, Matroska (MKV), MP4, Ogg, Flash Video (FLV) and WebM files, etc. It only consists of LAV Filters (for video demultiplexing and audio and video decoding), DirectVobSub (for subtitle decoding), Codec Tweak Tool, Icaros ...
A standardized (or in some cases de facto standard) video file type such as .webm is a profile specified by a restriction on which container format and which video and audio compression formats are allowed. The coded video and audio inside a video file container (i.e. not headers, footers, and metadata) is called the essence.
Original file (WebM audio/video file, VP9, length 1 min 28 s, 1,920 × 1,080 pixels, 20 kbps overall, file size: 210 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The files uploaded to the Commons repository can be used like locally uploaded files on all projects on the Wikimedia servers in all languages, including Wikipedia, Wikibooks, Wikisource and Wikinews, or downloaded for offsite use, as all of the content is either in the public domain or released under licenses such as the Creative Commons ...
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All modern browsers will play video (Theora and WebM) and audio (Vorbis and MP3) files from Wikipedia, no modifications needed. On older iOS, iPadOS, and macOS devices, software decoding will be used. This might be a bit slow compared to what you are used to on such devices. Internet Explorer is NOT supported.
Now it says: "A WebM file consists of VP8 video and Vorbis audio streams in a container based on a profile of Matroska." Since we're now talking about files rather than formats, I changed the expression "container format" to "container", because the actual file is (or contains) the container, not the container specification (format).