[jknutson]

Technically speaking, how do they accomplish this? Given the amount of advertisers they have, the amount of ads that each advertiser is showing, and the amount of variations of those ads that they’re showing (5s, 15s, etc), I think we can safely rule out the possibly that they’re just splicing together an infinite amount of permutations of ads and videos and saving them to disk.

They must be doing some sort of on-the-fly streaming of these ads? It cannot be the case that they’re trying to actually transcode / edit all those different ad possibilities together.