I have previously been able to copy a legitimately purchased dvd into itunes, download it to my ipod touch and watch the film on it. I have downloaded the latest ipod software and am running the latest version of itunes. Having ripped new dvd films using Handbrake into my imac itunes library, when I sync my ipod,  I get the message 'the film could not be copied to your ipod as it cannot be played on this ipod'. These downloads are in exactly the same format as earlier films copied via Handbrake and these do download to my ipod and play on it, in spite of the message claim that my ipod can't do this. Any answers?