[Theora] How to use ffmpeg2theora with DVD Source?

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I've made a home DVD from my last holidays.

Now i want to pass this DVD to Theora , to show in my
Linux Box.

I copy all .vob files in my HD.

I see the program ffmpeg2theora that can convert a lot
files into Theora , but i don't know how to pass this
.vob files to ffmpeg2theora.

How to use ffmpeg2theora with DVD Source?

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