The main issue I have here is are the 720P, 480P, 240P. Classes for defining video quality or do they unambiguously define the resolution of the video? If you have a video file, and all you know is that it's 1080p then it's safe to assume it's 1920x1080. The 1080p and 720p formats are often 16:9 aspect ratio. If you have a video file, and all you know is that it's 480p then it's safe to assume it's 720x480.

The main issue I have here is are the 720P, 480P, 240P. Classes for defining video quality or do they unambiguously define the resolution of the video? For example, the wikipedia article about 240P refers to a family of resolutions.

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The 480p formats are often 4:3 aspect ratio. While it's true that 1080p only tells you scan lines you can assume the video resolution if the context is that of a regular video file. There are exceptions. NetFlix uses HD Video but it's shown at 720p which isn't true HD. So later they came out with UltraHD which is 1080p. Still, the video compression is high so the quality is low.

Samsung has released new TVs that display UltraHD which is 4320p at 16:9. Unless resolution is explicitly stated it's difficult to always know exactly what it is. One trick is to divide by 45. If you get an remainder then it's 4:3 and if no remainder it's 16:9. 4320 / 45 = 96 (16:9) 1080 / 45 = 24 (16:9) 720 / 45 = 16 (16:9) 480 / 45 = 10.6666 (4:3) 240 / 45 = 5.3333 (4:3).

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This needs clarifying. Clime is correct. The P in 1080p 720p refers to 'progressive'. It means that the image is intended to be render its lines to screen one line at a time, sequentially. This comes from the old days where TV was a cathode-ray tube device that needed to render images in an interlaced manner to improve the temporal appearance to the viewer -- start at the top, then emit the even lines first then return to the top then the odd lines odd lines. The set of lines that is half a picture it called a 'field' and a full image is made up of two interlaced fields. We refer to these formats as 1080i, 720i.

To get the spatial resolution you must look beyond the name of the format because, as you've found, they are as best ambiguous. The info you need is in the file's header as metadata.