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WebM

WebM is an audiovisual media file format. 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. Wikipedia
Container for: VP8/VP9/AV1 (video); Vorbis/Opus (audio)
Developed by: Initially On2, Xiph, and Matroska; later Google
Filename extension: webm
Initial release: May 18, 2010; 13 years ago
Latest release: v1.13.0; January 31, 2023; 13 months ago