X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Flib%2Fvideo_decoder.cc;h=eb5d2e71f8d340b34cf4f8d6e27e51dd4628b1b7;hb=2b1f8bb12adc35dcd7f352885cb0f9a80b04093e;hp=9afbd31c46bbd4d52304b478c054fee62fa2e97d;hpb=130577d2e4e67de15ac8f5d6447729736d4bcac6;p=dcpomatic.git

diff --git a/src/lib/video_decoder.cc b/src/lib/video_decoder.cc
index 9afbd31c4..eb5d2e71f 100644
--- a/src/lib/video_decoder.cc
+++ b/src/lib/video_decoder.cc
@@ -76,6 +76,7 @@ VideoDecoder::emit (shared_ptr<const ImageProxy> image, Frame frame)
 	}
 	case VIDEO_FRAME_TYPE_3D_ALTERNATE:
 		Data (ContentVideo (image, frame / 2, (frame % 2) ? EYES_RIGHT : EYES_LEFT, PART_WHOLE));
+		frame /= 2;
 		break;
 	case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
 		Data (ContentVideo (image, frame, EYES_LEFT, PART_LEFT_HALF));