You can export the audio track from a H264 to MP3 format using several suitable multimedia converters.
Convert H.264 video to Compressed audio and music file, mp3 songs or ringtones.
We have found 5 software records in our database eligible for .h264 to .mp3 file format conversion.
Microsoft Windows software - convert h264 to mp3 on Windows
A multimedia converter for formats suitable for iPad tablets
Convert from h264 file format
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 mp3. 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.
A free universal media transcoder for Windows
Video converting software
One of the most popular and succesfful free video conversion sofrware
Apple macOS / Mac OS X software - convert h264 to mp3 on OS X
A free video converter for Mac & PC