Free FLV to MP4 Converter does exactly what the name promises with a few extra options to edit or combine several clips into one video.
Batch conversion: If you have several files to convert, you won't have to convert them individually.
Four-step process: It's actually three, since choosing a Profile isn't really necessary, and each step is easily initiated with large buttons to add and edit files before converting.
Basic editing tools: While you won't find anything fancy here, you can crop, add effects, and add audio to your videos.
Profile confusion: The default is iPad, but there are 15 devices or apps to choose from. If the software handled multiple outputs, the numerous options would be beneficial. But since you're limited to MP4, choosing iPad over Windows from the lengthy Profile pull-down menu just adds a bit of confusion.
Free FLV to MP4 is limited in scope, but it works exactly as promised. If your needs are elementary, and you just want to convert your FLV files to play elsewhere, this app gets the job done. If you want more flexibility, look elsewhere.