What are the factors affecting video file size

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I want to send various video files from different CCTVs over the internet. To minimiz bandwidth usage and time of upload, I'd like to understand the various factors that affect the file size, so I can arrive at the right mix. All related info is welcome! Thanks in advance!

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The ONLY factors are bitrate and duration. Multiply them together and you get the size. Now bitrate will affect video quality, so you must find the balance for your application.