Analog, DSR, and PDTV sources used to be often reencoded to 512×384 if fullscreen, currently to 640x480 if fullscreen and 720x404 if widescreen. HDTV sources are reencoded to multiple resolutions such as 720x404 (360p), 960×540 (540p), 1280×720 (720p), and 1920x1080 (1080p) at various file sizes for pirated releases. They can be progressive scan captured or not (480i digital transmission or 1080i broadcast for HD caps).
Blu-ray or Bluray rips (once known as BDRip) are encoded directly from a Blu-ray disc source to a 2160p, 1080p or 720p (depending on the source), and use the x264 or x265 codec. They can be ripped from BD25, BD50 disc (or UHD Blu-ray at higher resolutions or bitrates), and even Remuxes. BDRip now refers to a Blu-ray source that has been encoded to a lower resolution (i.e. 1080p down to 720p/576p/480p). BDRips can go from 2160p to 1080p, etc as long as they go downward in resolution of the source disc. BRRips, which are often mistaken for BDRips, are an already encoded video at HD resolution that is then transcoded to another resolution (usually SD). BDRips are not a transcode, but BRRips are, which change their quality. BD/BRRips in DVDRip resolutions can vary between XviD/x264/x265 codecs (commonly 700 MB and 1.5 GB in size as well as larger DVD5 or DVD9: 4.5 GB or 8.4GB). Size fluctuates depending on the length and quality of releases, but the higher the size the more likely they use the x264/x265 codecs. A BD/BRRip to a lower resolution looks better, regardless, because the encode is from a higher quality source. BDRips have followed the above guideline after Blu-ray replaced the BDRip title structure in scene releases.
Although it's the most common specification used to sell TVs these days, partly because "eight million pixels" sounds really impressive, resolution is not the most important ingredient in picture quality. Just because a TV says "4K Ultra HD" doesn't always mean it's better than a 1080p TV. It usually does, but not always, and for reasons that have little to do with resolution. See the article Why 4K TVs aren't stupid (anymore) for more on that.
By the way, 1080i is the same resolution as 1080p, but only these days appears as a source resolution, not as a TV resolution. There are no 1080i TVs anymore, but many HDTV broadcasts are still in 1080i.
Today, televisions throughout the world use the standard window sizes known as High Definition or HD. There are two different sizes recognized by that standard usually displayed as 1080p/1080i or 720p/720i. The window size for those are 1920 pixels wide x 1080 pixels high, or 1280 pixels wide x 720 pixels high, respectively. A pixel is the smallest dot on a screen that is made up of a red, green and blue light source.
Choosing resolution can be quite puzzling and there is a temptation to just to shoot the highest quality available, without first considering what the video is being used for. Some of the latest smartphones can shoot up to 8K resolution, which is higher than many DSLRs. Some new DSLRs are still limited to HD (1080p) resolution when shooting video.
As it happens, the human eye has less problem with missing chroma (colour) information than luma (brightness) information. So in compressed video formats colour information is sacrificed. Due to this process, 1080p video can look poorer quality than 4K, EVEN when you are viewing the video at HD resolution.
Therefore, it makes sense to record at a higher video resolution, even if you will master the video at a lower quality. In addition, uploading a 4K video to a platform like YouTube should result in a better looking video than uploading 1080p, even when viewed at 1080p.
There have been jokes and gimmicks and workarounds, but there has never been anything like high-quality, high-definition 3D for Hollywood movies in the home before now. The reality of a major manufacturer's consumer display that offers true 3D--in full 1080p HD--is finally upon us. Samsung has managed bring to market one of the very first 3D HDTVs with their exceptionally well-featured UN55C8000 LED LCD HDTV, the 55-inch model in a line which also includes 46- and 65-inch screen sizes. This 3D TV was reviewed in conjunction with the Samsung BD-C6900 Blu-ray 3D Player, so I'm not spoiling any surprises when I say that 3D in the home can be pretty darned incredible. 2b1af7f3a8