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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.
Original file (WebM audio/video file, VP8, length 9.2 s, 1,920 × 1,080 pixels, 5.52 Mbps overall, file size: 6.03 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
VP8 is an open and royalty-free video compression format released by On2 Technologies in 2008.. Initially released as a proprietary successor to On2's previous VP7 format, VP8 was released as an open and royalty-free format in May 2010 after Google acquired On2 Technologies.
Original file (WebM audio/video file, VP9/Opus, length 2 min 29 s, 1,920 × 1,188 pixels, 1.52 Mbps overall, file size: 27.06 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Some containers only support a restricted set of video formats: DMF only supports MPEG-4 Visual ASP with DivX profiles. EVO only supports MPEG-4 AVC, MPEG-1 Video, MPEG-2 Video and VC-1. F4V only supports MPEG-4 AVC, MPEG-4 Visual and H.263. FLV only supports MPEG-4 Visual, VP6, Sorenson Spark and Screen Video. MPEG-4 AVC in FLV is possible ...
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 ...
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.
This was the first version in the TrueMotion series of proprietary lossy video compression formats and video codec. This format compressed frame in either a 32-bit or 16-bit RGB color space with a FourCC of DUCK (or TMOT for a version of TrueMotion S that was licensed by Horizon Technologies [21]). It is usually put in an AVI container.
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