How to convert .3g2 files to .h264 format.
Converting 3GPP2 Multimedia Files directly to H.264 Encoded Video Files (.3g2 to .h264 conversion) is certainly possible and quite straightforward.
Use one of several currently available video editing programs or converters, such as FFmpeg or Adapter.
Alternatively, you can try some online conversion tools, which allow users to easily convert .3g2 to .h264.
A free video converter for Mac & PC
Program for multimedia streaming and conversion