Try freeware Jaksta Free Media Converter, MediaCoder and Format Factory first.

We do NOT recommend even to try software from spammers:
Wondershare spammers, Aimersoft spammers, 4videosoft spammers, Aiseesoft spammers, shine spammers, Nidesoft spammers, Pavtube spammers, Xilisoft spammers, Xlinksoft spammers, iSkysoft spammers.
We are sorry if you have chosen the above mentioned software after reading spam posts. Always try software before buying. And we highly recommend not to buy software promoted by spammers, otherwise you will see more and more useless "reviews" in the Internet.