They can be strung together to form larger units like words. Representing one of the smallest units of digital data, it’s made up of eight bits.īits are either 1 or 0. What is a Byte?Ī byte is a unit of digital information that most computer systems use. For some people, thinking this way makes it easier to remember how many kilobytes are in a gigabyte. However, most people round this number down to one thousand KB in one MB and one million KB in a GB. So that means there are 1,048,576 KB in a GB. I'm oversimplifying a bit since compression is actually a pretty complicated field.Technically speaking, there are 1,024 kilobytes in a megabyte (MB) and 1,024 MB in a gigabyte (GB). (Though the loss of detail will make it slightly unpredictable, so it doesn't hold exactly. The amount of data used to store each pixel is thus the same, so the amount of artifacts should be pretty similar. This will result in a smaller file with similar relative quality, so long as you use similar compression ratios (the relationship between the size of the input and the file size).įor example, as a rough guideline, if a video is 1080p and takes 225MB in total, then you would want the 720p version to take around 100MB because there is a little under half the pixels in a 720p video than there is in the 1080p video. If you intend to make different resolutions for different connection speeds, you should decrease both the resolution and the bitrate. In some situations the best overall quality will be to reduce the resolution and bitrate and in other cases the best result will be to keep the resolution the same but only reduce the bitrate. It is a fluid question as to whether you lose more quality from the downscale or bitrate being used, so there is no preferred value to change. What you end up with is a lower resolution file that more faithfully reproduces the original format since it has more data storage allocated per pixel where as the higher resolution file produces more pixels in the output, but as it has less data available per pixel, it is a less faithful reproduction. The resolution has nothing to do with how much data is used, it only impacts the number of points of data which are encoded (and thus determines part of the quality of the video output for a given bitrate). The bitrate determines how much data is used per second. You are using the same bitrate for each video.
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