diff --git a/ChangeLog b/ChangeLog
index 2049d029a..f0add51c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2005-11-16  Moritz Bunkus  <moritz@bunkus.org>
+
+	* mkvmerge: bug fix: mkvmerge will now refuse to append AVC/h.264
+	video tracks whose codec initialization data blocks do not
+	match. Invalidates Anthill bug #163.
+
 2005-11-12  Moritz Bunkus  <moritz@bunkus.org>
 
 	* mkvmerge: bug fix: Fixed a crash If the granulepos (the
diff --git a/src/output/p_video.cpp b/src/output/p_video.cpp
index 09da4e791..d72c0a67e 100644
--- a/src/output/p_video.cpp
+++ b/src/output/p_video.cpp
@@ -779,3 +779,28 @@ mpeg4_p10_video_packetizer_c::process(packet_cptr packet) {
   return FILE_STATUS_MOREDATA;
 }
 
+connection_result_e
+mpeg4_p10_video_packetizer_c::can_connect_to(generic_packetizer_c *src,
+                                             string &error_message) {
+  connection_result_e result;
+  mpeg4_p10_video_packetizer_c *vsrc;
+
+  vsrc = dynamic_cast<mpeg4_p10_video_packetizer_c *>(src);
+  if (NULL == vsrc)
+    return CAN_CONNECT_NO_FORMAT;
+
+  result = video_packetizer_c::can_connect_to(src, error_message);
+  if (CAN_CONNECT_YES != result)
+    return result;
+
+  if ((NULL != ti.private_data) &&
+      memcmp(ti.private_data, vsrc->ti.private_data, ti.private_size)) {
+    error_message = mxsprintf("The codec's private data does not match."
+                              "Both have the same length (%d) but different "
+                              "content.", ti.private_size);
+    return CAN_CONNECT_NO_PARAMETERS;
+  }
+
+  return CAN_CONNECT_YES;
+}
+
diff --git a/src/output/p_video.h b/src/output/p_video.h
index b24a68887..2e990e98b 100644
--- a/src/output/p_video.h
+++ b/src/output/p_video.h
@@ -108,6 +108,9 @@ public:
                                track_info_c &_ti);
   virtual int process(packet_cptr packet);
 
+  virtual connection_result_e can_connect_to(generic_packetizer_c *src,
+                                             string &error_message);
+
 protected:
   virtual void extract_aspect_ratio();
 };