Editing Video (section)

===Aspect ratio===
[[Image:Aspect ratios.svg|thumbnail|250px|Comparison of common [[cinematography]] and traditional [[television]] (green) aspect ratios]]
[[Display aspect ratio|Aspect ratio]] describes the proportional relationship between the width and height of video screens and video picture elements.  All popular video formats are [[rectangular]], and this can be described by a ratio between width and height. The ratio of width to height for a traditional television screen is 4:3, or about 1.33:1. High-definition televisions use an aspect ratio of 16:9, or about 1.78:1. The aspect ratio of a full 35&nbsp;mm film frame with soundtrack (also known as the [[Academy ratio]]) is 1.375:1.<ref name=":6">{{Cite book |last=Bing |first=Benny |url=https://www.worldcat.org/oclc/672322796 |title=3D and HD broadband video networking |date=2010 |publisher=Artech House |isbn=978-1-60807-052-7 |location=Boston |pages=57–70 |oclc=672322796 |access-date=August 25, 2022 |archive-date=August 25, 2022 |archive-url=https://web.archive.org/web/20220825123924/https://www.worldcat.org/title/672322796 |url-status=live }}</ref><ref name=":7">{{Cite book |last=Stump |first=David |url=https://www.worldcat.org/oclc/1233023513 |title=Digital cinematography : fundamentals, tools, techniques, and workflows |date=2022 |publisher=[[Routledge]] |isbn=978-0-429-46885-8 |edition=2nd |location=New York, NY |pages=125–139 |oclc=1233023513 |access-date=August 25, 2022 |archive-date=August 25, 2022 |archive-url=https://web.archive.org/web/20220825123928/https://www.worldcat.org/title/1233023513 |url-status=live }}</ref>

[[Pixel]]s on computer monitors are usually square, but pixels used in [[digital video]] often have non-square aspect ratios, such as those used in the PAL and NTSC variants of the [[CCIR 601]] digital video standard and the corresponding anamorphic widescreen formats. The [[480p|720 by 480 pixel]] raster uses thin pixels on a 4:3 aspect ratio display and fat pixels on a 16:9 display.<ref name=":6" /><ref name=":7" />

The popularity of viewing video on mobile phones has led to the growth of [[vertical video]].  [[Mary Meeker]], a partner at Silicon Valley venture capital firm [[Kleiner Perkins Caufield & Byers]], highlighted the growth of vertical video viewing in her 2015 Internet Trends Report{{snd}}growing from 5% of video viewing in 2010 to 29% in 2015. Vertical video ads like [[Snapchat]]'s are watched in their entirety nine times more frequently than landscape video ads.<ref name=Constine>{{cite news|author=Constine, Josh|date=May 27, 2015|title=The Most Important Insights From Mary Meeker's 2015 Internet Trends Report|url=https://techcrunch.com/gallery/best-of-meeker/|work=TechCrunch|access-date=August 6, 2015|url-status=live|archive-url=https://web.archive.org/web/20150804234031/http://techcrunch.com/gallery/best-of-meeker/|archive-date=August 4, 2015}}</ref>