Since m4v is a kind of mp4 container, would be nice to be directly supoorted in Nuendo. Now simply changing the extension from .m4v to .mp4 it works. As I known m4v is a mp4 container that adds some kind of metadata refered about copy rights.
I usually transfirm lots of mxf into m4v to work and I’ve to do all the walkaround of changing extension.
Thanks SB.