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That would actually be a decent Google interview question. You'd need to identify units, make ballpark estimates, do a little bit of math.
For example, they say a picture is worth one thousand words. I estimate a typical newspaper contains 10,000 words and weighs one pound. So we have a rate of 10 pictures per pound. Let's ignore that newspapers also contain pictures.
A video contains roughly 30 frames per second, each frame a picture. YouTube has an absurd amount of video. They get about a million hours of uploads per day. Let's say that over their history they have 10 billion hours of video. That works out to 10 billion hours * 30 frames per second = 1,080,000,000,000,000 frames. Or, 108 trillion pounds.
In SotA multi-modal models, images are getting tokenized to 256 tokens, or ~196 words :)
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As SerialStateLineXer implied, given any of the usual compressions, only a fraction of the frames in a video will actually be pictures as such. Interesting technicalities I'm happy to remember from my university days: https://en.wikipedia.org/wiki/Video_compression_picture_types
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A frame of video will, on average, differ only slightly from the previous frame, and be worth much less than the thousand words a single picture is worth. This is why videos can compressed at much higher ratios than still images with minimal perceivable loss of quality.
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