From: Carl Hetherington <cth@carlh.net>
Date: Thu, 2 Dec 2021 19:16:02 +0000 (+0100)
Subject: Fix possible incorrect eye mapping with 3D-alternate sources.
X-Git-Tag: checked-for-v2.16.x~155
X-Git-Url: https://git.carlh.net/gitweb/?p=dcpomatic.git;a=commitdiff_plain;h=8f1c55575379cf22389ec034bfce605eba0f47d3

Fix possible incorrect eye mapping with 3D-alternate sources.
---

diff --git a/src/lib/video_decoder.cc b/src/lib/video_decoder.cc
index cee4bcdc6..8d6f7e6c7 100644
--- a/src/lib/video_decoder.cc
+++ b/src/lib/video_decoder.cc
@@ -105,7 +105,7 @@ VideoDecoder::emit (shared_ptr<const Film> film, shared_ptr<const ImageProxy> im
 
 		if (vft == VideoFrameType::THREE_D_ALTERNATE) {
 			frame = decoder_frame / 2;
-			eyes = (decoder_frame % 1) ? Eyes::RIGHT : Eyes::LEFT;
+			eyes = (decoder_frame % 2) ? Eyes::RIGHT : Eyes::LEFT;
 		} else {
 			frame = decoder_frame;
 			if (vft == VideoFrameType::THREE_D) {