WebM
 |
|
| Filename extension | .webm |
|---|---|
| Internet media type | video/webm, |
| Developed by | Initially On2, Xiph, and Matroska; later Google |
| Initial release | May 18, 2010 |
| Type of format | Video file format |
| Container for |
VP8/VP9 (video) Vorbis/Opus (audio) |
| Extended from | Limited subset of Matroska |
| Open format? | Yes |
| Website | www |
WebM is a video file format. It is primarily intended to offer a royalty-free alternative to use in the HTML5 video tag. 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. WebM initially supported VP8 video and Vorbis audio streams. In 2013 it was updated to accommodate VP9 video and Opus audio.
Native WebM support by Mozilla Firefox,Opera, and Google Chrome was announced at the 2010 Google I/O conference. Internet Explorer 9 requires third-party WebM software.Safari for Mac OS X relies on QuickTime to play web media, which as of 1 April 2011[update], does not support WebM unless a third-party plug-in is installed. In January 2011, Google announced that the WebM Project Team will release plugins for Internet Explorer and Safari to allow playback of WebM files through the standard HTML5 <video> tag. As of 9 June 2012[update], a public preview version of this plug-in is available for Internet Explorer 9.
VLC media player,MPlayer and K-Multimedia Player have native support for playing WebM files.FFmpeg can encode and decode VP8 videos when built with support for libvpx, the VP8/VP9 codec library of the WebM project, as well as mux/demux WebM-compliant files. On 23 July 2010, Fiona Glaser, Ronald Bultje, and David Conrad of the FFmpeg team announced the ffvp8 decoder. Through testing they determined that ffvp8 was faster than Google's own libvpx decoder.MKVToolNix, the popular Matroska creation tools, have implemented support for multiplexing/demultiplexing WebM-compliant files out of the box. Haali Media Splitter has also announced support for muxing/demuxing of WebM. As of version 1.4.9, the LiVES video editor has support for realtime decoding and for encoding to WebM format using ffmpeg libraries.
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