Confused about writing a media converter

I want to write my own media converter application using ffmpeg. I have a couple of questions

1. Can I use a command line to make the conversion. I don't think that would work if the user hasn't installed ffmpeg on to his system. If that's the case, how'd I over开发者_开发百科come it. I don't believe their API has anything for media conversion.

2. Is it possible to write it in Java?

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You can provide an ffmeg binary with your application, and use the ProcessBuilder and/or Runtime class to invoke it. You would need a different binary for each OS you intend to target though.