Fix _position with VIDEO_FRAME_TYPE_3D_ALTERNATE.

diff --git a/src/lib/video_decoder.cc b/src/lib/video_decoder.cc
index 9afbd31c46bbd4d52304b478c054fee62fa2e97d..eb5d2e71f8d340b34cf4f8d6e27e51dd4628b1b7 100644 (file)
--- 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));