I’ve ran into a situation in iTunes where I have video blog content or movies that I create not syncing with my iPod. Instead I get this error:

I tracked the problem down to the profile in the MPEG settings for H.264 video. I had to set the Restrict Profile(s) to Baseline. I was specifically using QuickTime Pro, however, this setting should be set in any video editing application. I’m not sure what issues there might be there for Windows users.