EyeTV video conversions freezing

[FredT2]

I passed on my 2009 Mac Mini to my daughter recently. She is using it as a DVR, recording TV shows, converting them to iTunes, and then watching on a TV set using Apple TV. There is a Turbo.264 HD stick on the Mini to make conversions go reasonably fast. The problem is that a fairly large number of conversions have a problem whereby at a certain point the video freezes. The sound continues, but the video stops completely and never starts again. I've had her try different export settings, iPad, Apple TV, etc. but that hasn't helped. I can have her try HandBrake, but that's not a very good solution because it's so slow (doesn't use the Turbo.264 stick) and not automatic. I'm puzzled, because I used that machine for two years without that problem. I was using Snow Leopard and it now has Mountain Lion, maybe that has something to do with it. Any suggestions?