With specialized video processing tools, such as VirtualDub, users may edit or convert various MPEG videos, including those that have mpg and mpv suffixes, but generally are of the same format. You can download the program for free and try it yourself.
Convert MPEG 1 video file format to MPEG 1 video.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert mpg to mpv on Windows
A free program for video capture and processing for Windows
Convert from mpg file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.