diff --git a/test/resize_test.cc b/test/resize_test.cc
index c5f05f31048eeaa2b9964d1c84494057b8917501..017730899b6b525f5682952720684a5538a0ac6b 100644
--- a/test/resize_test.cc
+++ b/test/resize_test.cc
@@ -90,74 +90,178 @@ struct FrameInfo {
   unsigned int h;
 };
 
-unsigned int ScaleForFrameNumber(unsigned int frame, unsigned int val) {
-  if (frame < 10)
-    return val;
-  if (frame < 20)
-    return val * 3 / 4;
-  if (frame < 30)
-    return val / 2;
-  if (frame < 40)
-    return val;
-  if (frame < 50)
-    return val * 3 / 4;
-  if (frame < 60)
-    return val / 2;
-  if (frame < 70)
-    return val * 3 / 4;
-  if (frame < 80)
-    return val;
-  if (frame < 90)
-    return val * 3 / 4;
-  if (frame < 100)
-    return val / 2;
-  if (frame < 110)
-    return val * 3 / 4;
-  if (frame < 120)
-    return val;
-  if (frame < 130)
-    return val * 3 / 4;
-  if (frame < 140)
-    return val / 2;
-  if (frame < 150)
-    return val * 3 / 4;
-  if (frame < 160)
-    return val;
-  if (frame < 170)
-    return val / 2;
-  if (frame < 180)
-    return val * 3 / 4;
-  if (frame < 190)
-    return val;
-  if (frame < 200)
-    return val * 3 / 4;
-  if (frame < 210)
-    return val / 2;
-  if (frame < 220)
-    return val * 3 / 4;
-  if (frame < 230)
-    return val;
-  if (frame < 240)
-    return val / 2;
-  if (frame < 250)
-    return val * 3 / 4;
-  return val;
+void ScaleForFrameNumber(unsigned int frame,
+                         unsigned int initial_w,
+                         unsigned int initial_h,
+                         unsigned int *w,
+                         unsigned int *h,
+                         int flag_codec) {
+  if (frame < 10) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 20) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 30) {
+    *w = initial_w / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 40) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 50) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 60) {
+    *w = initial_w / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 70) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 80) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 90) {
+    *w = initial_w / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 100) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 110) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 120) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 130) {
+    *w = initial_w / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 140) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 150) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 160) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 170) {
+    *w = initial_w / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 180) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 190) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 200) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 210) {
+    *w = initial_w / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 220) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 230) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  if (frame < 240) {
+    *w = initial_w * 3 / 4;
+    *h = initial_h * 3 / 4;
+    return;
+  }
+  if (frame < 250) {
+    *w = initial_w  / 2;
+    *h = initial_h / 2;
+    return;
+  }
+  if (frame < 260) {
+    *w = initial_w;
+    *h = initial_h;
+    return;
+  }
+  // Go down very low.
+  if (frame < 270) {
+    *w = initial_w / 4;
+    *h = initial_h / 4;
+    return;
+  }
+  if (flag_codec == 1) {
+    // Cases that only works for VP9.
+    // For VP9: Swap width and height of original.
+    if (frame < 320) {
+      *w = initial_h;
+      *h = initial_w;
+      return;
+    }
+  }
+  *w = initial_w;
+  *h = initial_h;
 }
 
 class ResizingVideoSource : public ::libvpx_test::DummyVideoSource {
  public:
   ResizingVideoSource() {
     SetSize(kInitialWidth, kInitialHeight);
-    limit_ = 300;
+    limit_ = 350;
   }
-
+  int flag_codec_;
   virtual ~ResizingVideoSource() {}
 
  protected:
   virtual void Next() {
     ++frame_;
-    SetSize(ScaleForFrameNumber(frame_, kInitialWidth),
-            ScaleForFrameNumber(frame_, kInitialHeight));
+    unsigned int width;
+    unsigned int height;
+    ScaleForFrameNumber(frame_, kInitialWidth, kInitialHeight, &width, &height,
+                        flag_codec_);
+    SetSize(width, height);
     FillFrame();
   }
 };
@@ -184,15 +288,17 @@ class ResizeTest : public ::libvpx_test::EncoderTest,
 
 TEST_P(ResizeTest, TestExternalResizeWorks) {
   ResizingVideoSource video;
+  video.flag_codec_ = 0;
   cfg_.g_lag_in_frames = 0;
   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
 
   for (std::vector<FrameInfo>::const_iterator info = frame_info_list_.begin();
        info != frame_info_list_.end(); ++info) {
     const unsigned int frame = static_cast<unsigned>(info->pts);
-    const unsigned int expected_w = ScaleForFrameNumber(frame, kInitialWidth);
-    const unsigned int expected_h = ScaleForFrameNumber(frame, kInitialHeight);
-
+    unsigned int expected_w;
+    unsigned int expected_h;
+    ScaleForFrameNumber(frame, kInitialWidth, kInitialHeight,
+                        &expected_w, &expected_h, 0);
     EXPECT_EQ(expected_w, info->w)
         << "Frame " << frame << " had unexpected width";
     EXPECT_EQ(expected_h, info->h)
@@ -386,6 +492,7 @@ class ResizeRealtimeTest : public ::libvpx_test::EncoderTest,
 
 TEST_P(ResizeRealtimeTest, TestExternalResizeWorks) {
   ResizingVideoSource video;
+  video.flag_codec_ = 1;
   DefaultConfig();
   // Disable internal resize for this test.
   cfg_.rc_resize_allowed = 0;
@@ -395,9 +502,10 @@ TEST_P(ResizeRealtimeTest, TestExternalResizeWorks) {
   for (std::vector<FrameInfo>::const_iterator info = frame_info_list_.begin();
        info != frame_info_list_.end(); ++info) {
     const unsigned int frame = static_cast<unsigned>(info->pts);
-    const unsigned int expected_w = ScaleForFrameNumber(frame, kInitialWidth);
-    const unsigned int expected_h = ScaleForFrameNumber(frame, kInitialHeight);
-
+    unsigned int expected_w;
+    unsigned int expected_h;
+    ScaleForFrameNumber(frame, kInitialWidth, kInitialHeight,
+                        &expected_w, &expected_h, 1);
     EXPECT_EQ(expected_w, info->w)
         << "Frame " << frame << " had unexpected width";
     EXPECT_EQ(expected_h, info->h)
diff --git a/vp9/common/vp9_alloccommon.c b/vp9/common/vp9_alloccommon.c
index 24c6c54edd40dca33d4f96ffe1771ad7826eb71a..7dd1005d3febe8fe0c6fb3ba0a04f3a0e7514e34 100644
--- a/vp9/common/vp9_alloccommon.c
+++ b/vp9/common/vp9_alloccommon.c
@@ -119,6 +119,20 @@ void vp9_free_context_buffers(VP9_COMMON *cm) {
   cm->lf.lfm = NULL;
 }
 
+
+int vp9_alloc_loop_filter(VP9_COMMON *cm) {
+  vpx_free(cm->lf.lfm);
+  // Each lfm holds bit masks for all the 8x8 blocks in a 64x64 region.  The
+  // stride and rows are rounded up / truncated to a multiple of 8.
+  cm->lf.lfm_stride = (cm->mi_cols + (MI_BLOCK_SIZE - 1)) >> 3;
+  cm->lf.lfm = (LOOP_FILTER_MASK *)vpx_calloc(
+      ((cm->mi_rows + (MI_BLOCK_SIZE - 1)) >> 3) * cm->lf.lfm_stride,
+      sizeof(*cm->lf.lfm));
+  if (!cm->lf.lfm)
+    return 1;
+  return 0;
+}
+
 int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
   int new_mi_size;
 
@@ -151,15 +165,8 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
     cm->above_context_alloc_cols = cm->mi_cols;
   }
 
-  vpx_free(cm->lf.lfm);
-
-  // Each lfm holds bit masks for all the 8x8 blocks in a 64x64 region.  The
-  // stride and rows are rounded up / truncated to a multiple of 8.
-  cm->lf.lfm_stride = (cm->mi_cols + (MI_BLOCK_SIZE - 1)) >> 3;
-  cm->lf.lfm = (LOOP_FILTER_MASK *)vpx_calloc(
-      ((cm->mi_rows + (MI_BLOCK_SIZE - 1)) >> 3) * cm->lf.lfm_stride,
-      sizeof(*cm->lf.lfm));
-  if (!cm->lf.lfm) goto fail;
+  if (vp9_alloc_loop_filter(cm))
+    goto fail;
 
   return 0;
 
diff --git a/vp9/common/vp9_alloccommon.h b/vp9/common/vp9_alloccommon.h
index c0e51a6ce64082fbe0c5a640c77484cea760247e..e53955b99883d3683451b8d3ec62bab20160709d 100644
--- a/vp9/common/vp9_alloccommon.h
+++ b/vp9/common/vp9_alloccommon.h
@@ -23,6 +23,7 @@ struct BufferPool;
 
 void vp9_remove_common(struct VP9Common *cm);
 
+int vp9_alloc_loop_filter(struct VP9Common *cm);
 int vp9_alloc_context_buffers(struct VP9Common *cm, int width, int height);
 void vp9_init_context_buffers(struct VP9Common *cm);
 void vp9_free_context_buffers(struct VP9Common *cm);
diff --git a/vp9/encoder/vp9_encoder.c b/vp9/encoder/vp9_encoder.c
index ff176fb9376e98cf6df233c225c3d76525fa710b..429a9cecd6579796729d31ddf3a6def73cc0496d 100644
--- a/vp9/encoder/vp9_encoder.c
+++ b/vp9/encoder/vp9_encoder.c
@@ -1538,8 +1538,12 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
       realloc_segmentation_maps(cpi);
       cpi->initial_width = cpi->initial_height = 0;
       cpi->external_resize = 0;
+    } else if (cm->mi_alloc_size == new_mi_size &&
+             (cpi->oxcf.width > last_w || cpi->oxcf.height > last_h)) {
+        vp9_alloc_loop_filter(cm);
     }
   }
+
   update_frame_size(cpi);
 
   if ((last_w != cpi->oxcf.width || last_h != cpi->oxcf.height) &&