X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fvideo_decoder.cc;fp=src%2Flib%2Fvideo_decoder.cc;h=8d6f7e6c77651af66ebe4a46235274e47531f5d8;hb=32cb43f74ff60d37e809e2e70e751574d6c286b2;hp=cee4bcdc696d64fde8d4e69957c1355b517560d1;hpb=01e979c79f7d0aa20fac1bb24c699e0636168294;p=dcpomatic.git

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) {