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Original file (WebM audio/video file, VP9, length 38 s, 1,920 × 1,080 pixels, 22.35 Mbps overall, file size: 101.35 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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.
WebM.webm Google: 2010-05 Royalty-free [38] Yes Yes Yes Yes Yes [39] Yes [39] RealMedia Variable Bitrate .rmvb RealNetworks: 2003 Proprietary: Yes Yes Yes Yes Yes [40] No DivX Media Format (DMF) .divx DivX, Inc. 2005-06 Proprietary: Yes Yes Yes Yes Yes Yes
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.
Each compression specification defines various mechanisms by which raw video (in essence, a sequence of full-resolution uncompressed digital images) can be reduced in size, from simple bit compression (like Lempel-Ziv-Welch) to psycho-visual and motion summarization, and how the output is stored as a bit stream. So long as the encoder component ...
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This is a listing of open-source codecs—that is, open-source software implementations of audio or video coding formats, audio codecs and video codecs respectively. Many of the codecs listed implement media formats that are restricted by patents and are hence not open formats.
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