It should be possible to convert videos in M4V format to 3GPP using programs like Movavi Video Converter.
Convert MPEG-4 video file format to 3GPP Third generation partnership project movie.
We found 2 software records in the database related to .m4v to .3gpp file format conversion.
Microsoft Windows software - convert m4v to 3gpp on Windows
A fully-featured video conversion program
Convert from m4v file format
|Yes, Movavi Video Converter Personal supports m4v file conversion as a source file type.||No||No||No||No||No||No||No|
|Yes, Movavi Video Converter Personal supports 3gpp 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 m4v to 3gpp. 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.
Apple macOS / Mac OS X software - convert m4v to 3gpp on OS X
A fully-featured video converter for Mac