What is the resolution of m p4 video in car? Why can't I download the M V in car navigation?

It depends on the decoding scheme of your navigation. Like the DVD navigation I used before, the best one is 480, but it won't work at 720. Now that I have changed the rearview mirror of Yunjing, I basically don't worry about this problem. General 1080P and lossless music are fine. In this case, I suggest the next format factory change the format and try resolution 480 or AVI format.