Fix theoretical int overflow.

diff --git a/src/lib/dcpomatic_time.h b/src/lib/dcpomatic_time.h
index 9e7191b1eb7dc239a890aebc2d6efa5fe81d3f75..1b12ea901653ead8afd3f935679eaea8ecf6e57a 100644 (file)
--- a/src/lib/dcpomatic_time.h
+++ b/src/lib/dcpomatic_time.h
@@ -217,11 +217,11 @@ public:
                HMSF hmsf;
 
                hmsf.h = ff / (3600 * r);
-               ff -= hmsf.h * 3600 * r;
+               ff -= static_cast<int64_t>(hmsf.h) * 3600 * r;
                hmsf.m = ff / (60 * r);
-               ff -= hmsf.m * 60 * r;
+               ff -= static_cast<int64_t>(hmsf.m) * 60 * r;
                hmsf.s = ff / r;
-               ff -= hmsf.s * r;
+               ff -= static_cast<int64_t>(hmsf.s) * r;
 
                hmsf.f = static_cast<int> (ff);
                return hmsf;