Watching movie from what device? If it's a blu ray or DVD player let the receiver decode the signal as Dolby Digital, DTS, TrueHD or DTS-HD.
TV, Cable or Sat dish sends HD movies in Dolby Digital.
You should only need Pro Logic II for 2 channel sources like older movies that are not Dolby Digital.
Since you didn't list any of your other devices its hard to give you better info.