_frame = _frame->scale (_frame->size(), Scaler::from_id ("fastbilinear"), PIX_FMT_RGB24, false);
_position = pvf.front()->time ();
_inter_position = pvf.front()->inter_position ();
_frame = _frame->scale (_frame->size(), Scaler::from_id ("fastbilinear"), PIX_FMT_RGB24, false);
_position = pvf.front()->time ();
_inter_position = pvf.front()->inter_position ();