Sorry you've waited 5 years. I assume you never found an answer, because Neither have I, nor has anyone. MPC knows and displays frame numbers, until you pause or scrub, then it forgets the frame number. VLC and MPC both had an addon that did this, but none of them work anymore. VirtualDub can do this, but doesn't open literally ANY modern codec or container.

I've found literally hundreds of request for this info, feature requests, complains about previous methods no longer working, and NOBODY, from any video player team, seems to care.