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Bitrate is the amount of digital data for a specific period of time. It is a property for both digital audio and video. Bitrate can be constant (CBR, every second of video uses up the same amount of space) or variable (VBR, each frame will use a different bitrate based on how much information the frame holds, thus producing better quality encodings).

For example, if a video file is said to have a bitrate of 800 Kbps, it means that for each second of the video, 800 kilobits is being used (either constant or an average). You can then use this information to work out the final size of the video.

Digital Measurements

  • Bit - the most basic digital unit, either a 0 or a 1.
  • Byte - 8 bits
  • Kilobyte (kB or KB) - 1000 or 1024 bytes
  • Megabyte (MB) - 1000 kB or 1024 KB
  • Gigabyte (GB) - 1000 MB or 1024 MB