The factors that affect the amount of storage needed for a video system are Video Resolution, Bitrate and Codec. There are different video resolutions used for different sources. The higher resolution of a video, the bigger the file size. Bitrate refers to the depth of information and is often measured as the amount of information per second. Higher bitrates mean more information, but you also need more storage for that information-heavy footage. A codec is a mathematical algorithm that defines how the image information is stored in the same digitized video sequence. Depending on your codec, the same media can be defined with different bitrates. Hence, all three factors affect the file size, which will determine the amount of storage needed for your video system.