Tag your videos in iTunes as HD.
There are other apps out there that allow you to tag your videos with the HD tag but none so far that I've found that allow you to tag multiple files at once.
I originally wrote this app for my own personal use and it came in handy when I was digitally storing all of my TV Shows and needed to tag the HD ones with the HD tag so that iTunes would display the HD icon.
HD Tag will save you countless hours, maybe even days, depending on the amount of files you need to tag.
Supported File Types: