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-rw-r--r--src/lib/video_decoder.cc2
1 files changed, 1 insertions, 1 deletions
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) {