diff --git a/aom_util/debug_util.c b/aom_util/debug_util.c
index ea73df8..4f9bdc1 100644
--- a/aom_util/debug_util.c
+++ b/aom_util/debug_util.c
@@ -14,17 +14,6 @@
 #include <string.h>
 #include "aom_util/debug_util.h"
 
-#define QUEUE_MAX_SIZE 2000000
-static int result_queue[QUEUE_MAX_SIZE];
-static int nsymbs_queue[QUEUE_MAX_SIZE];
-static aom_cdf_prob cdf_queue[QUEUE_MAX_SIZE][16];
-
-static int queue_r = 0;
-static int queue_w = 0;
-static int queue_prev_w = -1;
-static int skip_r = 0;
-static int skip_w = 0;
-
 static int frame_idx_w = 0;
 
 static int frame_idx_r = 0;
@@ -37,6 +26,18 @@
 
 int bitstream_queue_get_frame_read(void) { return frame_idx_r; }
 
+#if CONFIG_BITSTREAM_DEBUG
+#define QUEUE_MAX_SIZE 2000000
+static int result_queue[QUEUE_MAX_SIZE];
+static int nsymbs_queue[QUEUE_MAX_SIZE];
+static aom_cdf_prob cdf_queue[QUEUE_MAX_SIZE][16];
+
+static int queue_r = 0;
+static int queue_w = 0;
+static int queue_prev_w = -1;
+static int skip_r = 0;
+static int skip_w = 0;
+
 void bitstream_queue_set_skip_write(int skip) { skip_w = skip; }
 
 void bitstream_queue_set_skip_read(int skip) { skip_r = skip; }
@@ -74,3 +75,178 @@
     }
   }
 }
+#endif  // CONFIG_BITSTREAM_DEBUG
+
+#if CONFIG_MISMATCH_DEBUG
+static int frame_buf_idx_r = 0;
+static int frame_buf_idx_w = 0;
+static int max_frame_buf_num = 5;
+#define MAX_FRAME_STRIDE 1280
+#define MAX_FRAME_HEIGHT 720
+static uint8_t
+    frame_pre[5][3][MAX_FRAME_STRIDE * MAX_FRAME_HEIGHT];  // prediction only
+static uint8_t
+    frame_tx[5][3][MAX_FRAME_STRIDE * MAX_FRAME_HEIGHT];  // prediction + txfm
+static int frame_stride = MAX_FRAME_STRIDE;
+static int frame_height = MAX_FRAME_HEIGHT;
+static int frame_size = MAX_FRAME_STRIDE * MAX_FRAME_HEIGHT;
+void mismatch_move_frame_idx_w() {
+  frame_buf_idx_w = (frame_buf_idx_w + 1) % max_frame_buf_num;
+  if (frame_buf_idx_w == frame_buf_idx_r) {
+    printf("frame_buf overflow\n");
+    assert(0);
+  }
+}
+
+void mismatch_reset_frame() {
+  for (int plane = 0; plane < 3; ++plane) {
+    memset(frame_pre[frame_buf_idx_w][plane], 0,
+           sizeof(frame_pre[frame_buf_idx_w][plane][0]) * frame_size);
+    memset(frame_tx[frame_buf_idx_w][plane], 0,
+           sizeof(frame_tx[frame_buf_idx_w][plane][0]) * frame_size);
+  }
+}
+
+void mismatch_move_frame_idx_r() {
+  if (frame_buf_idx_w == frame_buf_idx_r) {
+    printf("frame_buf underflow\n");
+    assert(0);
+  }
+  frame_buf_idx_r = (frame_buf_idx_r + 1) % max_frame_buf_num;
+}
+
+void mismatch_record_block_pre(const uint8_t *src, int src_stride, int plane,
+                               int pixel_c, int pixel_r, int blk_w, int blk_h) {
+  if (pixel_c + blk_w >= frame_stride || pixel_r + blk_h >= frame_height) {
+    printf("frame_buf undersized\n");
+    assert(0);
+  }
+  for (int r = 0; r < blk_h; ++r) {
+    for (int c = 0; c < blk_w; ++c) {
+      frame_pre[frame_buf_idx_w][plane][(r + pixel_r) * frame_stride + c +
+                                        pixel_c] = src[r * src_stride + c];
+    }
+  }
+#if 0
+  int ref_frame_idx = 3;
+  int ref_plane = 1;
+  int ref_pixel_c = 162;
+  int ref_pixel_r = 16;
+  if (frame_idx_w == ref_frame_idx && plane == ref_plane &&
+      ref_pixel_c >= pixel_c && ref_pixel_c < pixel_c + blk_w &&
+      ref_pixel_r >= pixel_r && ref_pixel_r < pixel_r + blk_h) {
+    printf(
+        "\nrecord_block_pre frame_idx %d plane %d pixel_c %d pixel_r %d blk_w "
+        "%d blk_h %d\n",
+        frame_idx_w, plane, pixel_c, pixel_r, blk_w, blk_h);
+  }
+#endif
+}
+void mismatch_record_block_tx(const uint8_t *src, int src_stride, int plane,
+                              int pixel_c, int pixel_r, int blk_w, int blk_h) {
+  if (pixel_c + blk_w >= frame_stride || pixel_r + blk_h >= frame_height) {
+    printf("frame_buf undersized\n");
+    assert(0);
+  }
+  for (int r = 0; r < blk_h; ++r) {
+    for (int c = 0; c < blk_w; ++c) {
+      frame_tx[frame_buf_idx_w][plane][(r + pixel_r) * frame_stride + c +
+                                       pixel_c] = src[r * src_stride + c];
+    }
+  }
+#if 0
+  int ref_frame_idx = 3;
+  int ref_plane = 1;
+  int ref_pixel_c = 162;
+  int ref_pixel_r = 16;
+  if (frame_idx_w == ref_frame_idx && plane == ref_plane &&
+      ref_pixel_c >= pixel_c && ref_pixel_c < pixel_c + blk_w &&
+      ref_pixel_r >= pixel_r && ref_pixel_r < pixel_r + blk_h) {
+    printf(
+        "\nrecord_block_tx frame_idx %d plane %d pixel_c %d pixel_r %d blk_w "
+        "%d blk_h %d\n",
+        frame_idx_w, plane, pixel_c, pixel_r, blk_w, blk_h);
+  }
+#endif
+}
+void mismatch_check_block_pre(const uint8_t *src, int src_stride, int plane,
+                              int pixel_c, int pixel_r, int blk_w, int blk_h) {
+  if (pixel_c + blk_w >= frame_stride || pixel_r + blk_h >= frame_height) {
+    printf("frame_buf undersized\n");
+    assert(0);
+  }
+  int mismatch = 0;
+  for (int r = 0; r < blk_h; ++r) {
+    for (int c = 0; c < blk_w; ++c) {
+      if (frame_pre[frame_buf_idx_r][plane]
+                   [(r + pixel_r) * frame_stride + c + pixel_c] !=
+          src[r * src_stride + c]) {
+        mismatch = 1;
+      }
+    }
+  }
+  if (mismatch) {
+    printf(
+        "\ncheck_block_pre failed frame_idx %d plane %d pixel_c %d pixel_r "
+        "%d blk_w %d blk_h %d\n",
+        frame_idx_r, plane, pixel_c, pixel_r, blk_w, blk_h);
+    printf("enc\n");
+    for (int rr = 0; rr < blk_h; ++rr) {
+      for (int cc = 0; cc < blk_w; ++cc) {
+        printf("%d ", frame_pre[frame_buf_idx_r][plane]
+                               [(rr + pixel_r) * frame_stride + cc + pixel_c]);
+      }
+      printf("\n");
+    }
+
+    printf("dec\n");
+    for (int rr = 0; rr < blk_h; ++rr) {
+      for (int cc = 0; cc < blk_w; ++cc) {
+        printf("%d ", src[rr * src_stride + cc]);
+      }
+      printf("\n");
+    }
+    assert(0);
+  }
+}
+void mismatch_check_block_tx(const uint8_t *src, int src_stride, int plane,
+                             int pixel_c, int pixel_r, int blk_w, int blk_h) {
+  if (pixel_c + blk_w >= frame_stride || pixel_r + blk_h >= frame_height) {
+    printf("frame_buf undersized\n");
+    assert(0);
+  }
+  int mismatch = 0;
+  for (int r = 0; r < blk_h; ++r) {
+    for (int c = 0; c < blk_w; ++c) {
+      if (frame_tx[frame_buf_idx_r][plane]
+                  [(r + pixel_r) * frame_stride + c + pixel_c] !=
+          src[r * src_stride + c]) {
+        mismatch = 1;
+      }
+    }
+  }
+  if (mismatch) {
+    printf(
+        "\ncheck_block_tx failed frame_idx %d plane %d pixel_c %d pixel_r "
+        "%d blk_w %d blk_h %d\n",
+        frame_idx_r, plane, pixel_c, pixel_r, blk_w, blk_h);
+    printf("enc\n");
+    for (int rr = 0; rr < blk_h; ++rr) {
+      for (int cc = 0; cc < blk_w; ++cc) {
+        printf("%d ", frame_tx[frame_buf_idx_r][plane]
+                              [(rr + pixel_r) * frame_stride + cc + pixel_c]);
+      }
+      printf("\n");
+    }
+
+    printf("dec\n");
+    for (int rr = 0; rr < blk_h; ++rr) {
+      for (int cc = 0; cc < blk_w; ++cc) {
+        printf("%d ", src[rr * src_stride + cc]);
+      }
+      printf("\n");
+    }
+    assert(0);
+  }
+}
+#endif  // CONFIG_MISMATCH_DEBUG