---
 libavcodec/libx264.c |   25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index b8974f9..9001597 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -402,6 +402,7 @@ static int X264_frame(AVCodecContext *ctx, AVPacket *pkt, 
const AVFrame *frame,
     x264_nal_t *nal;
     int nnal, i, ret;
     x264_picture_t pic_out;
+    AVFrameSideData *side_data;
 
     /* encoder does not pick b_interlaced changes from x264_encoder_reconfig() 
*/
     if (frame && frame->interlaced_frame && !x4->params.b_interlaced) {
@@ -437,8 +438,30 @@ static int X264_frame(AVCodecContext *ctx, AVPacket *pkt, 
const AVFrame *frame,
             x4->params.vui.i_sar_width  = ctx->sample_aspect_ratio.num;
             x264_encoder_reconfig(x4->enc, &x4->params);
         }
-    }
+#if X264_BUILD >= 111
+        side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_STEREO3D);
+        if (side_data) {
+            AVStereo3D *stereo_info;
+            int type;
+
+            stereo_info = (AVStereo3D *)side_data->data;
+            switch (stereo_info->type) {
+                case STEREO_CHECKERS: type = 0; break;
+                case STEREO_LINES: type = 1; break;
+                case STEREO_COLUMNS: type = 2; break;
+                case STEREO_SIDEBYSIDE: type = 3; break;
+                case STEREO_TOPBOTTOM: type = 4; break;
+                case STEREO_FRAMESEQUENCE: type = 5; break;
+                default: type = -1; break;
+            }
 
+            if (type != x4->params.i_frame_packing) {
+                x4->params.i_frame_packing = type;
+                x264_encoder_reconfig(x4->enc, &x4->params);
+            }
+        }
+#endif
+    }
     do {
         if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, 
&pic_out) < 0)
             return -1;
-- 
1.7.9.5

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