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Note that a video file normally contains both video and audio content, each encoded in its own format. The browser has to support both the video and audio formats. See HTML audio for a table of which audio formats are supported by each browser. The video format can be specified by MIME type in HTML (see example ).
Media Source Extensions ( MSE) is a W3C specification that allows JavaScript to send byte streams to media codecs within web browsers that support HTML video and audio. [5] Among other possible uses, this allows the implementation of client-side prefetching and buffering code for streaming media entirely in JavaScript.
Encrypted Media Extensions. Encrypted Media Extensions ( EME) is a W3C specification for providing a communication channel between web browsers and the Content Decryption Module (CDM) software which implements digital rights management (DRM). [2] This allows the use of HTML video to play back DRM-wrapped content such as streaming video services ...
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VP9 is a traditional block-based transformcoding format. The bitstream format is relatively simple compared to formats that offer similar bitrate efficiency like HEVC. [46] VP9 has many design improvements compared to VP8. Its biggest improvement is support for the use of coding units[47]of 64×64 pixels.
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Audio codecs. FLAC – Lossless codec developed by Xiph.Org Foundation. LAME – Lossy compression (MP3 format). TooLAME / TwoLAME – Lossy compression (MP2 format). Musepack – Lossy compression; based on MP2 format, with many improvements. Speex – Low bitrate compression, primarily voice; developed by Xiph.Org Foundation.