diff --git a/media/libvpx/vp8/vp8_dx_iface.c b/media/libvpx/vp8/vp8_dx_iface.c
--- a/media/libvpx/vp8/vp8_dx_iface.c
+++ b/media/libvpx/vp8/vp8_dx_iface.c
@@ -315,16 +315,46 @@ update_error_state(vpx_codec_alg_priv_t 
     if ((res = error->error_code))
         ctx->base.err_detail = error->has_detail
                                ? error->detail
                                : NULL;
 
     return res;
 }
 
+static void yuvconfig2image(vpx_image_t               *img,
+                            const YV12_BUFFER_CONFIG  *yv12,
+                            void                      *user_priv)
+{
+    /** vpx_img_wrap() doesn't allow specifying independent strides for
+      * the Y, U, and V planes, nor other alignment adjustments that
+      * might be representable by a YV12_BUFFER_CONFIG, so we just
+      * initialize all the fields.*/
+    img->fmt = yv12->clrtype == REG_YUV ?
+        VPX_IMG_FMT_I420 : VPX_IMG_FMT_VPXI420;
+    img->w = yv12->y_stride;
+    img->h = (yv12->y_height + 2 * VP8BORDERINPIXELS + 15) & ~15;
+    img->d_w = yv12->y_width;
+    img->d_h = yv12->y_height;
+    img->x_chroma_shift = 1;
+    img->y_chroma_shift = 1;
+    img->planes[VPX_PLANE_Y] = yv12->y_buffer;
+    img->planes[VPX_PLANE_U] = yv12->u_buffer;
+    img->planes[VPX_PLANE_V] = yv12->v_buffer;
+    img->planes[VPX_PLANE_ALPHA] = NULL;
+    img->stride[VPX_PLANE_Y] = yv12->y_stride;
+    img->stride[VPX_PLANE_U] = yv12->uv_stride;
+    img->stride[VPX_PLANE_V] = yv12->uv_stride;
+    img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
+    img->bps = 12;
+    img->user_priv = user_priv;
+    img->img_data = yv12->buffer_alloc;
+    img->img_data_owner = 0;
+    img->self_allocd = 0;
+}
 
 static vpx_codec_err_t vp8_decode(vpx_codec_alg_priv_t  *ctx,
                                   const uint8_t         *data,
                                   unsigned int            data_sz,
                                   void                    *user_priv,
                                   long                    deadline)
 {
     vpx_codec_err_t res = VPX_CODEC_OK;
@@ -424,30 +454,18 @@ static vpx_codec_err_t vp8_decode(vpx_co
         if (vp8dx_receive_compressed_data(ctx->pbi, data_sz, data, deadline))
         {
             VP8D_COMP *pbi = (VP8D_COMP *)ctx->pbi;
             res = update_error_state(ctx, &pbi->common.error);
         }
 
         if (!res && 0 == vp8dx_get_raw_frame(ctx->pbi, &sd, &time_stamp, &time_end_stamp, ppdeblocking, ppnoise, ppflag))
         {
-            /* Align width/height */
-            unsigned int a_w = (sd.y_width + 15) & ~15;
-            unsigned int a_h = (sd.y_height + 15) & ~15;
-
-            vpx_img_wrap(&ctx->img, VPX_IMG_FMT_I420,
-                         a_w + 2 * VP8BORDERINPIXELS,
-                         a_h + 2 * VP8BORDERINPIXELS,
-                         1,
-                         sd.buffer_alloc);
-            vpx_img_set_rect(&ctx->img,
-                             VP8BORDERINPIXELS, VP8BORDERINPIXELS,
-                             sd.y_width, sd.y_height);
+            yuvconfig2image(&ctx->img, &sd, user_priv);
             ctx->img_avail = 1;
-
         }
     }
 
     return res;
 }
 
 static vpx_image_t *vp8_get_frame(vpx_codec_alg_priv_t  *ctx,
                                   vpx_codec_iter_t      *iter)
diff --git a/media/libvpx/vpx_scale/generic/yv12config.c b/media/libvpx/vpx_scale/generic/yv12config.c
--- a/media/libvpx/vpx_scale/generic/yv12config.c
+++ b/media/libvpx/vpx_scale/generic/yv12config.c
@@ -42,50 +42,61 @@ vp8_yv12_de_alloc_frame_buffer(YV12_BUFF
 /****************************************************************************
  *
  ****************************************************************************/
 int
 vp8_yv12_alloc_frame_buffer(YV12_BUFFER_CONFIG *ybf, int width, int height, int border)
 {
 /*NOTE:*/
 
-    int yplane_size = (height + 2 * border) * (width + 2 * border);
-    int uvplane_size = ((1 + height) / 2 + border) * ((1 + width) / 2 + border);
-
     if (ybf)
     {
+        int y_stride = ((width + 2 * border) + 31) & ~31;
+        int yplane_size = (height + 2 * border) * y_stride;
+        /** There is currently a bunch of code which assumes
+          *  uv_stride == y_stride/2, so enforce this here. */
+        int uv_width = width >> 1;
+        int uv_height = height >> 1;
+        int uv_stride = y_stride >> 1;
+        int uvplane_size = ((1 + height) / 2 + border) * uv_stride;
+
         vp8_yv12_de_alloc_frame_buffer(ybf);
 
+        /** Only support allocating buffers that have a height and width that
+          *  are multiples of 16, and a border that's a multiple of 32.
+          * The border restriction is required to get 16-byte alignment of the
+          *  start of the chroma rows without intoducing an arbitrary gap
+          *  between planes, which would break the semantics of things like
+          *  vpx_img_set_rect(). */
+        if ((width & 0xf) | (height & 0xf) | (border & 0x1f))
+            return -3;
+
         ybf->y_width  = width;
         ybf->y_height = height;
-        ybf->y_stride = width + 2 * border;
+        ybf->y_stride = y_stride;
 
-        ybf->uv_width = (1 + width) / 2;
-        ybf->uv_height = (1 + height) / 2;
-        ybf->uv_stride = ybf->uv_width + border;
+        ybf->uv_width = uv_width;
+        ybf->uv_height = uv_height;
+        ybf->uv_stride = uv_stride;
 
         ybf->border = border;
         ybf->frame_size = yplane_size + 2 * uvplane_size;
 
         /* Added 2 extra lines to framebuffer so that copy12x12 doesn't fail
          * when we have a large motion vector in V on the last v block.
          * Note : We never use these pixels anyway so this doesn't hurt.
          */
-        ybf->buffer_alloc = (unsigned char *) duck_memalign(32,  ybf->frame_size + (ybf->y_stride * 2) + 32, 0);
+        ybf->buffer_alloc = (unsigned char *) vpx_memalign(32,  ybf->frame_size);
 
         if (ybf->buffer_alloc == NULL)
             return -1;
 
-        ybf->y_buffer = ybf->buffer_alloc + (border * ybf->y_stride) + border;
-
-        if (yplane_size & 0xf)
-            yplane_size += 16 - (yplane_size & 0xf);
-
-        ybf->u_buffer = ybf->buffer_alloc + yplane_size + (border / 2  * ybf->uv_stride) + border / 2;
-        ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size + (border / 2  * ybf->uv_stride) + border / 2;
+        ybf->y_buffer = ybf->buffer_alloc + (border * y_stride) + border;
+        ybf->u_buffer = ybf->buffer_alloc + yplane_size + (border / 2  * uv_stride) + border / 2;
+        ybf->v_buffer = ybf->buffer_alloc + yplane_size + uvplane_size + (border / 2  * uv_stride) + border / 2;
     }
     else
     {
         return -2;
     }
 
     return 0;
 }