I don't think there's any tools for that kind of conversion, meaning 3gp to mp4. And about the quality I must disagree with you. There isn't much difference in the quality and you can also wrap MPEG-4 video to 3gp-file format. I also think that most of the phones supporting video will also support 3GPP standards.
V / Forum Nokia
just change extension from 3gp to mp4
Not a good idea in my opinion, because MP4 and 3GP container formats are not the same. For example the AMR speech codec is not allowed in a *.mp4 file, not sure about H.263 video tracks.
Furthermore a *.3gp file does not have a IOD atom, as far as I know, which will confuse many standard-compliant MPEG-4 players.
At least now I know where all these "pseudo MP4" files come from...
By the way, theisborg assumes:
> Mp4 format is supported by the phones and has much higher
> image and sound quality.
Is this really true for Nokia mobile phones or other manufacturers? As far as I know, there is no support for this container format (with MPEG-4 video and AAC audio track) in multimedia mobile phones yet, or am I wrong?
not any that i know , even on manufacturer sites , it's difficult to get info about video most of the time .
Send me a mail at firstname.lastname@example.org , I can send you an interesting excel sheet with the different mp4 specs according to
phones and network