Welcome to WebmasterWorld Guest from 18.104.22.168
Forum Moderators: open
(length of video in seconds * kbps) / 8
So if you have a 700kbps video that is 20 minutes long (1200 seconds):
(1200 * 700) / 8 = 105,000 Kilobytes
Note the exact number can vary depending on overhead like meta data, variable bitrate video varies too as will the method used for variable bitrate like 2 pass encoding.