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Please detail your question or problem in as much detail as possible:
I'm trying to rip old security cam footage from a DVD. I've got an mkv file and can convert to a m4v, but handbrake won't let me convert to the mp4 container. It always seems to default to m4v. How can I change this?
Tell us about your environment. What version of HandBrake? What version of OSX are you running. etc.
Running Handbrake 1.0.7 on OS X El Capitan 10.11.6
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m4v and mp4 are interchangeable. iTunes used to need the .m4v extension in order to recognize certain features used in the file. You can safely change the extension to mp4.