diff --git a/vp8/common/generic/systemdependent.c b/vp8/common/generic/systemdependent.c
index 28dc262ae..6d5f302d7 100644
--- a/vp8/common/generic/systemdependent.c
+++ b/vp8/common/generic/systemdependent.c
@@ -94,6 +94,8 @@ void vp8_machine_specific_config(VP8_COMMON *ctx)
 {
 #if CONFIG_MULTITHREAD
     ctx->processor_core_count = get_cpu_count();
+#else
+    (void)ctx;
 #endif /* CONFIG_MULTITHREAD */
 
 #if ARCH_ARM
diff --git a/vp8/decoder/decodeframe.c b/vp8/decoder/decodeframe.c
index 566972ea7..51acdbb9c 100644
--- a/vp8/decoder/decodeframe.c
+++ b/vp8/decoder/decodeframe.c
@@ -144,8 +144,6 @@ static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
              */
             pbi->frame_corrupt_residual = 1;
             memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
-            vp8_conceal_corrupt_mb(xd);
-
 
             corruption_detected = 1;
 
@@ -625,8 +623,7 @@ static void decode_mb_rows(VP8D_COMP *pbi)
                      */
                     vp8_interpolate_motion(xd,
                                            mb_row, mb_col,
-                                           pc->mb_rows, pc->mb_cols,
-                                           pc->mode_info_stride);
+                                           pc->mb_rows, pc->mb_cols);
                 }
             }
 #endif
diff --git a/vp8/decoder/error_concealment.c b/vp8/decoder/error_concealment.c
index fbfae61e7..a73813fc0 100644
--- a/vp8/decoder/error_concealment.c
+++ b/vp8/decoder/error_concealment.c
@@ -558,8 +558,7 @@ static void interpolate_mvs(MACROBLOCKD *mb,
 
 void vp8_interpolate_motion(MACROBLOCKD *mb,
                         int mb_row, int mb_col,
-                        int mb_rows, int mb_cols,
-                        int mi_stride)
+                        int mb_rows, int mb_cols)
 {
     /* Find relevant neighboring blocks */
     EC_BLOCK neighbors[NUM_NEIGHBORS];
@@ -585,13 +584,3 @@ void vp8_interpolate_motion(MACROBLOCKD *mb,
     mb->mode_info_context->mbmi.partitioning = 3;
     mb->mode_info_context->mbmi.segment_id = 0;
 }
-
-void vp8_conceal_corrupt_mb(MACROBLOCKD *xd)
-{
-    /* This macroblock has corrupt residual, use the motion compensated
-       image (predictor) for concealment */
-
-    /* The build predictor functions now output directly into the dst buffer,
-     * so the copies are no longer necessary */
-
-}
diff --git a/vp8/decoder/error_concealment.h b/vp8/decoder/error_concealment.h
index 9a1e02486..b6b49725b 100644
--- a/vp8/decoder/error_concealment.h
+++ b/vp8/decoder/error_concealment.h
@@ -34,13 +34,7 @@ void vp8_estimate_missing_mvs(VP8D_COMP *pbi);
  * (mb_row, mb_col). */
 void vp8_interpolate_motion(MACROBLOCKD *mb,
                             int mb_row, int mb_col,
-                            int mb_rows, int mb_cols,
-                            int mi_stride);
-
-/* Conceal a macroblock with corrupt residual.
- * Copies the prediction signal to the reconstructed image.
- */
-void vp8_conceal_corrupt_mb(MACROBLOCKD *xd);
+                            int mb_rows, int mb_cols);
 
 #ifdef __cplusplus
 }  // extern "C"
diff --git a/vp8/decoder/threading.c b/vp8/decoder/threading.c
index 97979e3b2..3c1b8387e 100644
--- a/vp8/decoder/threading.c
+++ b/vp8/decoder/threading.c
@@ -136,8 +136,6 @@ static void mt_decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
              */
             pbi->frame_corrupt_residual = 1;
             memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
-            vp8_conceal_corrupt_mb(xd);
-
 
             corruption_detected = 1;
 
@@ -447,8 +445,7 @@ static void mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd, int start_mb_row)
                     */
                    vp8_interpolate_motion(xd,
                                           mb_row, mb_col,
-                                          pc->mb_rows, pc->mb_cols,
-                                          pc->mode_info_stride);
+                                          pc->mb_rows, pc->mb_cols);
                }
            }
     #endif
diff --git a/vp8/vp8_cx_iface.c b/vp8/vp8_cx_iface.c
index b19ab7a23..22a82b734 100644
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -783,6 +783,7 @@ static void pick_quickcompress_mode(vpx_codec_alg_priv_t  *ctx,
     }
 
 #else
+    (void)duration;
     new_qc = MODE_REALTIME;
 #endif