I have been trying so unsuccessfully to do this for about a year. 3GP files are common Sony Ericsson mobile phone video files, but you are unable to edit them in editing suites etc, as they are better in MPEG for viewing and editing.
I have downloaded various free programs like imtoo and the like. None of them have been great, or convert them into AVI's (which are really big in size)
I finally found a great program called AVOne 3GP Video Converter. The free trial (altho limited) worked perfectly, so I puchased the online version for about 15 pounds.
However this now wont convert all my clips, or will only convert half the clip. The one's it does convert doesn't sync the audio with the video correctly.
I emailed the company but to no avail (download.com reviews state they never reply).
Does anyone have any ideas of what else I can do? Or any other programs I can use? I need them to be converted to MPEGs and not AVIs. It's really frustrating. I understand quality will not be improved and the video clips will still be small etc, but I just have so many video clips I want to convert to MPEGs to use when making videos of my own!
Thanks =) Any replies appreciated!