Encoding a FLV file to MP4

I am relatively new to Adobe and all of its products, and this is my first exposure to Media Encoder CS5.
Quite simply I would like to encode a FLV file to MP4. When I drag the FLV file into AME, it tells me "The source compression type is not supported."
Just curious how to resolve this or whether I am doing something incorrect. I use a Mac Laptop running OS X 5.
Thanks

Colin is right. There's a bit more information about what what kind of FLV files AME CS5 can import here. The main point is that AME CS5 and later can only import FLV files that conatin video encoded with the On2 VP6 codec.

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