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The HEVC standard defines thirteen levels. [1] [2] A level is a set of constraints for a bitstream.[1] [2] For levels below level 4 only the Main tier is allowed.[1] [2] A decoder that conforms to a given tier/level is required to be capable of decoding all bitstreams that are encoded for that tier/level and for all lower tiers/levels.
High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard designed as part of the MPEG-H project as a successor to the widely used Advanced Video Coding (AVC, H.264, or MPEG-4 Part 10).
In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones. [32] In March 2008, a high-quality mode was added, which increased the resolution to 480×360 pixels. [33] In December 2008, 720p HD support was added. At the time of the 720p launch, the YouTube player was changed from a 4:3 aspect ratio to a widescreen 16:9 ...
This version added the High, High 10, High 4:2:2, and High 4:4:4 profiles. [14] After a few years, the High profile became the most commonly used profile of the standard. Version 4 (Edition 2.1): (September 13, 2005) Corrigendum containing various minor corrections and adding three aspect ratio indicators.
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
A short video explaining the concept of video codecs. A video codec is software or hardware that compresses and decompresses digital video.In the context of video compression, codec is a portmanteau of encoder and decoder, while a device that only compresses is typically called an encoder, and one that only decompresses is a decoder.
Invidious is a free and open-source alternative frontend to YouTube. [2] [3] It is available as a Docker container, [4] or from the GitHub master branch. [5]It is intended to be used as a lightweight and "privacy-respecting" alternative to the official YouTube website. [2]
[274] In 2013 Forbes ' Katheryn Thayer asserted that digital-era artists' work must not only be of high quality, but must elicit reactions on the YouTube platform and social media. [275] Videos of the 2.5% of artists categorized as "mega", "mainstream" and "mid-sized" received 90.3% of the relevant views on YouTube and Vevo in that year. [276]