trusty flv to psp converters?

i am having problems converting flv format to psp.
i have the k-lite codec pack installed on my comp which includes FDDShow but when i tried converting my video with youtube downloader, it says i still need codecs (my codecs are the latest version).
I tried super but when i tried it on my psp, it said it was unsupported data when even it was in mp4 format.
i tried some normal converters but it still had an error with converting.
is there some kind of a better way to convert or is there a good flv player for the psp?

It maybe work, if you convert the video once with SUPER to any format and then convert it again with another program. That should remove errors.