It should be quite possible to convert H264 based videos to common 3G2 (3GP) format using programs like Adapter. However, this could also be done with any other converter that supports various 3GP formats, so maybe check for H264 to 3GP conversion as well.
Convert H.264 video to 3GPP2 multimedia data.
We have found 2 software records in our database eligible for .h264 to .3g2 file format conversion.
Apple macOS / Mac OS X software - convert h264 to 3g2 on OS X
Adapter is a free video converter for Mac & PC. It is able to convert avi, save flash .flv, crop video and much more!
Convert from h264 file
|Yes, Adapter supports h264 file conversion as a source file type.||No||No||No||No||No||No||No|
to 3g2 file
|Yes, Adapter supports 3g2 file conversion as a target file type.||No||No||No||No||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned h264 to 3g2. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert h264 to 3g2 on any platform
FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge. No matter if they were designed by some standards committee, the community or a corporation.