iPod extension

I have been unable to convert any FLV to any format for the iPod. iTunes will not recognize it as a proper file.

Any ideas?

this was all fixed several weeks ago.

Is there an extension to make ipod audiobooks? The ones in format .m4b?

I know if you are ripping a video, it will make a .m4a audio file and you can use this (sort of) and manually change the extension to say .M4B. But is there a way to do this automatically to MP3 files without the added step of manually changing the extension?