if (i->position() < ph && ph < i->end(film)) {
FrameRateChange const frc = film->active_frame_rate_change (i->position ());
i->set_trim_end (ContentTime(i->position() + i->full_length(film) - ph, frc) - i->trim_start());
if (i->position() < ph && ph < i->end(film)) {
FrameRateChange const frc = film->active_frame_rate_change (i->position ());
i->set_trim_end (ContentTime(i->position() + i->full_length(film) - ph, frc) - i->trim_start());