hi, i'm very frustrated with this problem. I've been having this error a few times in the past couple months. it confuses me. the problem occurs on specific films. the first time, i simply checked if the file played back okay on the mac- it did. perfectly fine. remaining confused, i simply tried deleting it from the itunes library and adding it back. still not working with apple tv. i then tried copying it to my macbook HDD (my movies are on a NAS) and added the one on my hard drive to the itunes library.. then it worked. confused still i deleted the copy on the nas and copied this 'working one' from the macbook HDD and put it on the nas. and it seemed to be fix. strange. a month later it happened again, to the same movie. i thought the file must be slightly corrupted - until today! today it happened to another movie, and then strangly, without trying to fix it, it worked again later and still seems to work. and then just now this evening, another different film is giving me this error. this time, attempting my 'fix' hasn't made it work. neither has restarting the apple tv or macbook. i have a library of 200 movies ripped to itunes. before recently, they have always worked (apple tv is almost a year old, my macbook just over a year) is anyone else having this issue or know how to fix it??