From eb47cfe0cfe8afeea8207c4a78d8441b30b92c28 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Sun, 10 Dec 2017 21:54:50 +0000
Subject: Give a better error.

---
 src/lib/reel_writer.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/lib')

diff --git a/src/lib/reel_writer.cc b/src/lib/reel_writer.cc
index 10d405961..1e730259f 100644
--- a/src/lib/reel_writer.cc
+++ b/src/lib/reel_writer.cc
@@ -493,7 +493,12 @@ ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr
 	}
 
 	if (reel_subtitle_asset) {
-		DCPOMATIC_ASSERT (reel_subtitle_asset->duration() == period_duration);
+		if (reel_subtitle_asset->duration() != period_duration) {
+			throw ProgrammingError (
+				__FILE__, __LINE__,
+				String::compose ("%1 vs %2", reel_subtitle_asset->duration(), period_duration)
+				);
+		}
 		reel->add (reel_subtitle_asset);
 	}
 
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