I have PMS running on a Mac Pro, with all the movies on an external drive connected via USB2. I am playing on an AppleTV (latest version) connected via Cat5 to my router (TimeCapsule), and am running Yosemite (10.10.5). SD quality movies play fine, but HD movies will not play. They play for about 2 minutes, then stop. After that they will only play for about 5 seconds at a time before stopping again.
I have also tried connecting from my iPad, both at home and remotely, and get the same results. My network connection is 200mb down / 20mb up.
An example of an HD Movie that won't play is a 5.16GB mp4 file, 1280x532, - Codecs listed in the get info are AAC, H.264, AC3, Subtitle, CEA 608, QuickTime Text.
Can anyone offer suggestions that will help me solve this. It would be a bummer if I had to re-encode all my HD movies to a lower resolution to watch them.