When we are taught to look for high bitrates as an indicator of quality, that can feel a little like being shortchanged, especially when files from a '50 megabit' recording system sometimes average around 35. Quick Time Player will show some information in its movie Inspector window, though VLC possibly does a better job of creating a running average of the real amount of data that is being read from the file every second. Pressing control (or command, on a Mac), shift and J will bring up the Media Information window, within which is the Statistics tab.
On this simple graphical image, it actually using a tenth of thatAs so often, the reality of what is going here is a bit more complicated than some camera company attempting to swindle us out of a couple of dozen megabits per second. ….