What software do people use to convert mpeg and avi etc. to mp4 and 3gp for the K750 and W800. There seems to be some issues with mp4 video on my phone, some work and some only play the music. I have nero which ends up only being sound when i try to play converted files to mp4 so want a program that will convert film to playable media on my phone. preferrably free as well as it wont be used that much.