Video podcast in iTunes

I use iTunes for both music and various podcasts. One of the podcasts I subscribe to is the Lost official podcast, both video and audio, from ABC. I notice that the video podcasts, when played in iTunes, are anamorphically compressed and I can’t find any way to stretch them out to the correct aspect ratio. When I navigate to my iTunes folder and play it with Media Player Classic, it automatically stretches it to the correct aspect ratio. I’ve looked in vain for some setting in iTunes that would control this behavior, but can’t find any. Anyone know what to do?