Can't import mp4 files

Hello,
suddenly I can't import/open mp4 files with iTunes on my iMac anymore. I have no problem opening them with another application (quicktime) or open other files (mp3) with iTunes on my iMac. On my MacBook I still can open the exact same mp4 files with iTunes (same OS, same updates).
I opened a couple of files in a row. All the sudden iTunes refuses to open them (just the ones I've already imported before still work). Doubleclicking on a mp4 file makes iTunes start, but that's it. No import, no error, just nothing.
Does anyone have a clue what might have happened?
Katrin

Are they Audio or Video .mp4 files?
Were they created on a Mac or PC?
Have you ever been able to open .mp4 files on these systems before?
~Luke

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.. depends on, what's inside the mp4 ............

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