- int const h = t.seconds() / 3600;
- t -= DCPTime::from_seconds (h * 3600);
- int const m = t.seconds() / 60;
- t -= DCPTime::from_seconds (m * 60);
- int const s = t.seconds();
- t -= DCPTime::from_seconds (s);
- int const f = rint (t.seconds() * fps);
+ /* Do this calculation with frames so that we can round
+ to a frame boundary at the start rather than the end.
+ */
+ int64_t f = rint (t.seconds() * fps);
+
+ int const h = f / (3600 * fps);
+ f -= h * 3600 * fps;
+ int const m = f / (60 * fps);
+ f -= m * 60 * fps;
+ int const s = f / fps;
+ f -= s * fps;