Since both MPG4 and M4V files are probably the same, it could be enough to simply rename the extension. If that doesn't work, you can always convert them with any of the converter programs that support MPEG-4.
Convert MPEG-4 video file format to MPEG-4 video file format.
We found 3 software records in the database related to .mpg4 to .m4v file format conversion.
Microsoft Windows software - convert mpg4 to m4v on Windows
One of the most popular and succesfful free video conversion sofrware
Convert from mpg4 file format
|Yes, Freemake Video Converter supports mpg4 file conversion as a source file type.||No||No||No||No||No||No||No|
|Yes, Freemake Video Converter supports m4v 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 mpg4 to m4v. 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 fully-featured video conversion program
A software video converter for Apple TV