namespace FFMpegCore.Extend; public static class TimeSpanExtensions { public static string ToLongString(this TimeSpan timeSpan) { var hours = timeSpan.Hours; if (timeSpan.Days > 0) { hours += timeSpan.Days * 24; } return $"{hours:00}:{timeSpan.Minutes:00}:{timeSpan.Seconds:00}.{timeSpan.Milliseconds:000}"; } }