Editing Video (section)

===Video compression method (digital only)===
{{Main|Video compression}}

[[Uncompressed video]] delivers maximum quality, but at a very high [[Uncompressed video#Data rates|data rate]]. A variety of methods are used to compress video streams, with the most effective ones using a [[group of pictures]] (GOP) to reduce spatial and temporal [[Redundancy (information theory)|redundancy]]. Broadly speaking, spatial redundancy is reduced by registering differences between parts of a single frame; this task is known as ''[[intraframe]] compression'' and is closely related to [[image compression]]. Likewise, temporal redundancy can be reduced by registering differences between frames; this task is known as ''[[interframe]] compression'', including [[motion compensation]] and other techniques. The most common modern compression standards are [[MPEG-2]], used for [[DVD]], Blu-ray, and [[satellite television]], and [[MPEG-4]], used for [[AVCHD]], mobile phones (3GP), and the Internet.<ref>{{Cite book |last=Andy Beach |url=https://www.worldcat.org/oclc/1302274863 |title=Real World Video Compression |date=2008 |publisher=Peachpit Press |isbn=978-0-13-208951-7 |oclc=1302274863 |access-date=August 25, 2022 |archive-date=August 25, 2022 |archive-url=https://web.archive.org/web/20220825123925/https://www.worldcat.org/title/1302274863 |url-status=live }}</ref><ref>{{Cite book |last=Sanz |first=Jorge L. C. |url=https://www.worldcat.org/oclc/840292528 |title=Image Technology : Advances in Image Processing, Multimedia and Machine Vision |date=1996 |publisher=Springer Berlin Heidelberg |isbn=978-3-642-58288-2 |location=Berlin, Heidelberg |oclc=840292528 |access-date=August 25, 2022 |archive-date=August 25, 2022 |archive-url=https://web.archive.org/web/20220825124015/https://www.worldcat.org/title/840292528 |url-status=live }}</ref>