DVDNav current time
DVDNav module calculates the current time by taking the total time and then uses the block position to approximate the current playing time. Because of changing lenght of the blocksize this method is inaccurate.
A better method should be found, but this requires accessing the internal DVDread structure (see also [10144]). This functionality should be exposed from the dvdnav API and therefore requires libdvdnav development.