public function changeFPS($_old_fps, $_new_fps)
{
$cuesCount = $this->getCuesCount();
for ($i = 0; $i < $cuesCount; $i++) {
$cue = $this->getCue($i);
$old_start = $cue->getStart();
$old_stop = $cue->getStop();
$new_start = $old_start * ($_new_fps / $_old_fps);
$new_stop = $old_stop * ($_new_fps / $_old_fps);
$cue->setStart($new_start);
$cue->setStop($new_stop);
}
return $this;
}