Mobile advertising analyst Freewheel has announced that the iPad and the iPhone are by far the most popular non-PC devices when it comes to streaming video. Together, the two devices make up more than 60 percent of all non-PC video viewing. The conclusion comes from analysis of more than 14 billion videos viewed through ad-supported apps (such as Hulu), which also found that viewing video on mobile devices has tripled since 2011 to a total of 1.3 billion videos streamed to users….