what exactly mean 2160p, 1440p, 1080p, ... 144p?

Question

I need to tag each video i receive with either 2160p, 1440p, 1080p, ... 144p. But what is the exact definition of it ?

I know the definition of wikipedia :

2160p=3840x2160
1440p=2560×1440
1080p=1920×1080 
720p=1280×720   
480p=640×480    
360p=480×360    
240p=426×240    
144p=256×144    

ok, but with tag to assign to a video of for example 1200x700 ? 720p or 480p ? Same for a resolution of 1920x480, did i need to assign a resolution of 480p or 720p or 1080p ?

Answer 1

it is the pixel count.

1200x700 simply means: 1200 pixels in width and 700 pixels in height

so 1920x480 would not choose one of the other resolutions, it would stretch the video

the 360p here actually stands for the height. With this value and the screen ratio you can calculate the real resulotion.

so lets asume you use a typical 16:9 screen:

• 360p = 640x360 (360/9*16 = 640)
• 720p = 1280x720 (720/9*16 = 1280)
• 1080p = 1920x1080 (1080/9*16 = 1920)
• and so on..

the resolution youtube uses maybe is a bit different (e.g. the video player could be 5 pixels smaller due to the way they programmed it) and the developer just made it easy by writing the common value, so that everybody would understand it