Menu-domain seeks: menu PGCs sequence intro/transition segments and
the looping button segment as programs of one PGC, and the menu
subpicture is a one-shot packet at a cell start. dvdnav's time search
lands mid-cell (erratically so in menu VOBs, which often lack usable
time maps), skipping the subpicture and leaving the menu without
visible buttons until its next loop. Map menu seeks to program skips.
Title seeks: dvdnav_time_search() interpolates the target from cell
durations. On VBR content the landing can fall further short than the
seek step, so repeated relative seeks converge to a fixed point and
never advance. Use dvdnav_jump_to_sector_by_time(), which resolves
through the VTS time maps, with dvdnav_time_search() as the fallback for
titles without one. Accurate landings also let the hr-seek margin
shrink.
Kacper Michajłow
16896f33c0