Nielsen Media Research has gathered its first data on the audience for Apple Computer’s iPod, calling into question the popularity of its video offering. Owners of Apple’s ubiquitous portable media player spend far more time on it listening to music or audio podcasts than they do using it to watch TV or movies. That was among the findings in a preliminary study conducted by the audience-measurement service in October–about one year after a video window was introduced to iPod and its corresponding Internet platform, iTunes.