Compression (video)

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Key points

  • A video file has a number of factors that affect file size, including resolution, time is seconds and frame rate.
  • The resolution of the image in a video affects the frame storage size in the same way as a still image. Streaming videos often have a low resolution to reduce the file size.
  • Frame rate is the number of frames displayed per second. This can be reduced to make a video file smaller, but under 10 frames per second humans are unlikely to see a series of images as movement. Most videos are 25 frames per second or above.
  • In a video, lossy compression makes files smaller by identifying areas that do not change colour between frames, as well as creating colour blocks or repeating patterns using graphic compression.

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