Use Adapter for Mac to convert 3GPP2 multimedia file to H.264 video file format.
On another platforms you can use FFmpeg command line tool, open Bash (Terminal, command line) and type:
ffmpeg -i /path/to/your/file.3g2 -vcodec copy -acodec copy /path/to/your/newfile.h264
Updated: February 24, 2022
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