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The eleven character YouTube video identifier (64 possible characters used in each position), allows for a theoretical maximum of 64 11 or around 73.8 quintillion (73.8 billion billion) unique ids. YouTube announced that it would remove video responses for being an underused feature on August 27, 2013. [96]
The following tables compare general and technical information for a number of current, notable video hosting services. Please see the individual products' articles for further information. Please see the individual products' articles for further information.
In some countries, YouTube is blocked for more limited periods of time such as during periods of unrest, the run-up to an election, or in response to upcoming political anniversaries. In cases where the entire site is banned due to one particular video, YouTube will often agree to remove or limit access to that video in order to restore service.
Previously, there were three large services—Amazon Music, Apple's iTunes Match, and YouTube Music [2] —each incorporating an online music store (see comparison), with purchased songs from the associated music store not counting toward storage limits.
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.
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For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes: C o m p r e s s i o n R a t i o = U n c o m p r e s s e d D a t a R a t e C o m p r e s s e d D a t a R a t e {\displaystyle {\rm {Compression\;Ratio}}={\frac {\rm ...
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.