diff --git a/apps/aomdec.c b/apps/aomdec.c
index 4895258..2d8a962 100644
--- a/apps/aomdec.c
+++ b/apps/aomdec.c
@@ -99,14 +99,15 @@
     ARG_DEF(NULL, "framestats", 1, "Output per-frame stats (.csv format)");
 static const arg_def_t outbitdeptharg =
     ARG_DEF(NULL, "output-bit-depth", 1, "Output bit-depth for decoded frames");
-static const arg_def_t tilem = ARG_DEF(NULL, "tile-mode", 1,
-                                       "Tile coding mode "
-                                       "(0 for normal tile coding mode)");
+static const arg_def_t tilem =
+    ARG_DEF(NULL, "tile-mode", 1,
+            "Tile coding mode "
+            "(1 for large scale tile mode, refer to lightfield example)");
 static const arg_def_t tiler = ARG_DEF(NULL, "tile-row", 1,
-                                       "Row index of tile to decode "
+                                       "(debug) Row index of tile to decode "
                                        "(-1 for all rows)");
 static const arg_def_t tilec = ARG_DEF(NULL, "tile-column", 1,
-                                       "Column index of tile to decode "
+                                       "(debug) Column index of tile to decode "
                                        "(-1 for all columns)");
 static const arg_def_t isannexb =
     ARG_DEF(NULL, "annexb", 0, "Bitstream is in Annex-B format");
diff --git a/examples/lightfield_bitstream_parsing.c b/examples/lightfield_bitstream_parsing.c
index 7768e27..159f161 100644
--- a/examples/lightfield_bitstream_parsing.c
+++ b/examples/lightfield_bitstream_parsing.c
@@ -213,6 +213,7 @@
     if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
                                       pts))
       die_codec(&codec, "Failed to copy compressed camera frame header.");
+    free(frame_hdr_buf);
   }
 
   // Read out the image format.
@@ -220,6 +221,7 @@
   if (aom_codec_control(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
     die_codec(&codec, "Failed to get the image format");
   const int bps = get_image_bps(ref_fmt);
+  if (!bps) die_codec(&codec, "Invalid image format.");
   // read out the tile size.
   unsigned int tile_size = 0;
   if (aom_codec_control(&codec, AV1D_GET_TILE_SIZE, &tile_size))