From 8e2c92bcbfe67a47e790ca842d6c99376789f2b7 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Sat, 30 Nov 2019 20:25:48 +0100
Subject: Fix crash when exporting a 2D project containing 3D content (#1680).

---
 src/lib/ffmpeg_encoder.cc | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'src/lib/ffmpeg_encoder.cc')

diff --git a/src/lib/ffmpeg_encoder.cc b/src/lib/ffmpeg_encoder.cc
index 3f5b6f591..4614903db 100644
--- a/src/lib/ffmpeg_encoder.cc
+++ b/src/lib/ffmpeg_encoder.cc
@@ -142,7 +142,10 @@ FFmpegEncoder::go ()
 
 		for (int j = 0; j < gets_per_frame; ++j) {
 			pair<shared_ptr<PlayerVideo>, DCPTime> v = _butler->get_video ();
-			encoder->get(v.first->eyes())->video(v.first, v.second);
+			shared_ptr<FFmpegFileEncoder> fe = encoder->get (v.first->eyes());
+			if (fe) {
+				fe->video(v.first, v.second);
+			}
 		}
 
 		_history.event ();
@@ -220,6 +223,17 @@ FFmpegEncoder::FileEncoderSet::FileEncoderSet (
 shared_ptr<FFmpegFileEncoder>
 FFmpegEncoder::FileEncoderSet::get (Eyes eyes) const
 {
+	if (_encoders.size() == 1) {
+		/* We are doing a 2D export... */
+		if (eyes == EYES_LEFT) {
+			/* ...but we got some 3D data; put the left eye into the output... */
+			eyes = EYES_BOTH;
+		} else if (eyes == EYES_RIGHT) {
+			/* ...and ignore the right eye.*/
+			return shared_ptr<FFmpegFileEncoder>();
+		}
+	}
+
 	map<Eyes, boost::shared_ptr<FFmpegFileEncoder> >::const_iterator i = _encoders.find (eyes);
 	DCPOMATIC_ASSERT (i != _encoders.end());
 	return i->second;
-- 
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