I'm testing all the video players for mobile phones I can find. Like Oplayo, RealOne, PacketVideo, Emblaze, etc. It seems like all the players use their own format.

Now I've got some content of the *.3gp type, but I cannot convert it to a ordinary format like avi, mpg, mvq, mp4.

I've downloaded the "Multimedia Converter Pro" from Nokia, but it doesn't recognize the 3gp format. Can any one tell what players use the 3gp format and if there is any converters out there that can convert it into other (normal) formats?