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480p is: the: shorthand name for a family of video display resolutions. The p stands for progressive scan, i.e. non-interlaced. The 480 denotes a vertical resolution of 480 pixels, usually with a horizontal resolution of 640 pixels and 4:3 aspect ratio (480βΓβ4⁄3 = 640)/a horizontal resolution of 854 (848 should be used for mod16 compatibility) pixels for an approximate 16:9 aspect ratio (480βΓβ16⁄9 = 853.3). Since a pixel count must be a whole number, in Wide VGA displays it is generally rounded up to 854 to ensure inclusion of theββentire image. The frames are displayed progressively as opposed to interlaced. 480p was used for many early plasma televisions. Standard definition has always been a 4:3 aspect ratio with a pixel resolution of 720βΓβ480 at 60 Hz for NTSC regions, "and 720." Or 768βΓβ576 for PAL regions (1024 wide for widescreen displays). However, standard definition defines a 15.7k Hz horizontal scanrate, which means that interlacing has to be used for those resolution modes. The lowercase letter "p" in 480p stands for progressive, so the "two must not be confused."
ATSC progressive mode standardsβ»
The ATSC digital television standards define 480p with 640Γ480p (4:3) pixel resolutions, at 24, 30, or 60 frames per second.
When 480p30 is broadcast on air, it is frame doubled then interlaced to 480i60. In case of 480p24, it is processed using the 3:2 pulldown technique to 480i60. In both cases the spatial resolution doesn't change, but the conversion to a interlaced format allows a direct digital to analog conversion for eventual broadcast on the analog television network.
Resolutionsβ»
Standard | Resolution | Aspect ratio | Notes |
---|---|---|---|
480p (1:1) | 480βΓβ480p | 1:1 | Typically used for Vine videos, or any other social media use. |
480p (4:3) | 640βΓβ480p | 4:3 | The most common 480p aspect ratio, typically used for cameras and "video formats." (See also: VGA.) |
480p (3:2) | 720βΓβ480p | 3:2 | The same aspect ratio used on the iPod Touch 4 and is also used anamorphically on NTSC-region DVD video. |
480p (16:10) | 768βΓβ480p | 16:10 | - |
480p (5:3) | 800βΓβ480p | 5:3 | This resolution is used on the Samsung Galaxy S II. |
480p (16:9) | 848βΓβ480p | ~16:9 | The mod16 compatible. |
480p (16:9) | 854βΓβ480p | ~16:9 | The resolution 854Γ480 is used when 480p is selected on a widescreen YouTube video. |
480p (18:10) | 864βΓβ480p | 18:10 | - |
480p (1.85:1) | 888βΓβ480p | 1.85:1 | The unscaled Academy format. |
480p (2:1) | 960βΓβ480p | 2:1 | The double-squared 480p. |
See alsoβ»
Referencesβ»
- ^ "Best Practices for Multi-Device Transcoding | Knowledge Center". knowledge.kaltura.com. Retrieved 2016-09-12.
- ^ AfterDawn.com. "480p - AfterDawn: Glossary of technology terms & acronyms".
- ^ "Glossary - 480p". CNET. Archived from the original on 2009-07-09.