The most likely choice for a wve to m4v conversion seems to be the export of Wondershare Video Editor projects (.wve) as MPEG-4 video (saved as m4v). If you looking for this particular conversion, you can do that in the program using the default export function found in the program.
It is unlikely that any other software would be able to convert wve to m4v, so using the original program is the only choice here. You will also need the original multimedia data that were processed, considering that the projects contain only references.Open WVE file Open M4V file
A discontinued video editing software replaced by Wondershare Filmora