void seek_by (dcpomatic::DCPTime by, bool accurate);
/** @return our `playhead' position; this may not lie exactly on a frame boundary */
dcpomatic::DCPTime position () const {
void seek_by (dcpomatic::DCPTime by, bool accurate);
/** @return our `playhead' position; this may not lie exactly on a frame boundary */
dcpomatic::DCPTime position () const {