From 50e6acde52c7eaa3afa239bc14f08eced3787bd9 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Mon, 8 Jul 2013 23:10:01 +0100
Subject: Somewhat hacky fix to crashes in A/B with some filters.

---
 src/lib/combiner.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src')

diff --git a/src/lib/combiner.cc b/src/lib/combiner.cc
index 367cefa7f..f7d634832 100644
--- a/src/lib/combiner.cc
+++ b/src/lib/combiner.cc
@@ -45,6 +45,14 @@ Combiner::process_video (shared_ptr<const Image> image, bool, shared_ptr<Subtitl
 void
 Combiner::process_video_b (shared_ptr<const Image> image, bool, shared_ptr<Subtitle> sub, double t)
 {
+	if (!_image) {
+		/* It's possible for filters in the A-side to mean that we get a B frame
+		   before any A; just skip the B frame in that case.  This at least prevents
+		   a crash, but may not be right.
+		*/
+		return;
+	}
+	
 	/* Copy the right half of this image into our _image */
 	/* XXX: this should probably be in the Image class */
 	for (int i = 0; i < image->components(); ++i) {
-- 
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