Video choppy in Apple TV2, iTunes, RealPlayer and QT - but perfect in VLC

I have some videos that are really choppy when I play then on iTunes on my iMac (OS X with the latest updates). I have rebooted and nothing else is running except iTunes and it is still choppy.
Tried RealPlayer and Quicktime (standalone) and its choppy with both of them.
Playing on my Apple TV is also choppy. Apple TV is on wired network.
All of my video files are on USB SATA drive connected to my iMac.
Note that I can bring up VLC on my iMac, navigate to the video file (mp4) and it plays flawlessly, off of the same USB SATA drive.
Video file is 720x398, H.246 AAC, color profile SD (6-1-6), total bit rate 1,628, frame rate 29.97.
Could be how it is encoded?

Yes, encoding could likely be the culprit. May have more luck posing in the quicktime section

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