To work this out you just need to know the average length of the videos, what bitrate you are encoding them to, and whether you are going to provide different download sizes (different bitrates).
Example: if your videos are an average of 12 minutes, and you encode to an average 600Kb/s, that will give you a file size of (12 x 60 x 600) / 8 = 54000Kb or about 53Mb. If you want to store 100k of those, you'll need about 5175Tb. That's without offering different video sizes.
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