Filename extension
Internet media type
Developed byInitially On2, Xiph, and Matroska; later Google
Initial releaseMay 18, 2010; 11 years ago (2010-05-18)[1]
Latest release
December 19, 2019; 2 years ago (2019-12-19)
Type of formatContainer format
Container forVP8/VP9/AV1 (video)
Vorbis/Opus (audio)
Extended fromLimited subset of Matroska
Open format?Yes[3]
Free format?Yes[4]

WebM is an audiovisual media file format.[5] It is primarily intended to offer a royalty-free alternative to use in the HTML5 video and the HTML5 audio elements. It has a sister project, WebP, for images. The development of the format is sponsored by Google, and the corresponding software is distributed under a BSD license.

The WebM container is based on a profile of Matroska.[3][6][7] WebM initially supported VP8 video and Vorbis audio streams. In 2013, it was updated to accommodate VP9 video and Opus audio.[8]

An example of a WebM video
  1. ^ Release v0.9.0 – webmproject/libvpx – GitHub, May 18, 2010
  2. ^ "Release 2020-7-30 v1.9.0 "Quacking Duck"". github.com. July 30, 2020. Retrieved April 15, 2020.
  3. ^ a b "WebM FAQ". May 19, 2010. WebM is an open media file format designed for the web. WebM files consist of video streams compressed with the VP8 video codec and audio streams compressed with the Vorbis audio codec. The WebM file structure is based on the Matroska media container.
  4. ^ WebM (Partial draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. August 19, 2020. Retrieved December 1, 2021.
  5. ^ "The WebM Project – About WebM". webmproject.org.
  6. ^ Doig, Jeremy; Jazayeri, Mike (May 19, 2010), Introducing WebM, an open web media project, WebM Project, retrieved May 19, 2010
  7. ^ Montgomery, Chris (May 19, 2010), Xiph.Org announces support for the WebM open media project, Xiph, retrieved May 20, 2010
  8. ^ "The WebM Open Media Project Blog: VP9 Lands in Chrome Dev Channel". webmproject.org.

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