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youtube-dl is a free and open source software tool for downloading video and audio from YouTube [3] and over 1,000 other video hosting websites. [4] It is released under the Unlicense software license. [5] As of September 2021, youtube-dl is one of the most starred projects on GitHub, with over 100,000 stars. [6]
The Moving Picture Experts Group (MPEG) designed MP3 as part of its MPEG-1, and later MPEG-2, standards.MPEG-1 Audio (MPEG-1 Part 3), which included MPEG-1 Audio Layer I, II, and III, was approved as a committee draft for an ISO/IEC standard in 1991, [14] [15] finalized in 1992, [16] and published in 1993 as ISO/IEC 11172-3:1993. [7]
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The "Photo & Images" section incorporates the programs for image conversion and resizing, extracting JPEG frames from videos (Free Video To JPEG Converter), recording screen activities, making screenshots (Free Screen Recorder). The 3D section is composed of the programs to make 3D videos and 3D images. There are several algorithms which allow ...
Stream ripping (also called stream recording) is the process of saving data streams to a file. The process is sometimes referred to as destreaming.. Stream ripping is most often referred in the context of saving audio or video from streaming media websites and services such as YouTube outside of the officially-provided means of offline playback (if any) using unsanctioned software and tools.
YouTube originally offered videos at only one quality level, displayed at a resolution of 320×240 pixels using the Sorenson Spark codec (a variant of H.263), [29] [30] with mono MP3 audio. [31] In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones. [32]
Free video is used extensively on Wikipedia, and is also the exclusive type of video content stored on the Wikimedia Commons. While Wikipedia allows for the uploading of fair use video (only in Ogg Theora format), the Wikimedia Commons strictly forbids the uploading of fair use video or any video containing depiction of symbols or other content that is prior licensed under a proprietary license.
Each kind of quantification defines a corresponding closure operator on the set of formulas, by adding, for each free variable x, a quantifier to bind x. [9] For example, the existential closure of the open formula n >2 ∧ x n + y n = z n is the closed formula ∃ n ∃ x ∃ y ∃ z ( n >2 ∧ x n + y n = z n ); the latter formula, when ...
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