private ChapterTimeSpan ChangeFps(ChapterTimeSpan timeSpan, double fps)
{
return(ChapterTimeSpan.FromFrameRate(timeSpan.TotalSeconds, _framesPerSecond, fps));
}
public void ChangeFps(double newFps)
{
_chapters = _chapters.Select(cts => ChangeFps(cts, newFps)).ToList();
_duration = ChapterTimeSpan.FromFrameRate(_duration.TotalSeconds, _framesPerSecond, newFps);
_framesPerSecond = newFps;
}