Online video is becoming one of the hottest topics in consumer technology this year, with a brand-new Roku product, Apple TV rumors and a big Amazon announcement. And now, the latest online-video rumor, based on reports by tech site re/code, is that Yahoo is building an original video network, to debut this year, where it can replicate the success of some YouTube shows (and perhaps try to steal some of those shows). Regardless of whether the current report about Yahoo video turns out to be true, the company is falling behind in the hot area of original online video and has to do something to catch up.