diff --git a/ChangeLog b/ChangeLog
index 30b42dc4af..619e4bbd76 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2004-04-30  Ronald Bultje  <rbultje@ronald.bitfreak.net>
+
+	* gst/matroska/matroska-demux.c: (gst_matroska_demux_audio_caps):
+	  Really detect ac-3 audio.
+	* gst/typefind/gsttypefindfunctions.c: (matroska_type_find):
+	  really detect matroska files (off-by-1).
+
 2004-04-30  David Schleef  <ds@schleef.org>
 
 	* gst/qtdemux/qtdemux.c: (gst_qtdemux_loop_header),
diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index a038aade26..895b8d220c 100644
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -2375,7 +2375,8 @@ gst_matroska_demux_audio_caps (GstMatroskaTrackAudioContext * audiocontext,
     } else {
       gst_caps_set_simple (caps, "width", GST_TYPE_INT_RANGE, 32, 64, NULL);
     }
-  } else if (!strcmp (codec_id, GST_MATROSKA_CODEC_ID_AUDIO_AC3) ||
+  } else if (!strncmp (codec_id, GST_MATROSKA_CODEC_ID_AUDIO_AC3,
+          strlen (GST_MATROSKA_CODEC_ID_AUDIO_AC3)) ||
       !strcmp (codec_id, GST_MATROSKA_CODEC_ID_AUDIO_DTS)) {
     caps = gst_caps_new_simple ("audio/x-ac3", NULL);
   } else if (!strcmp (codec_id, GST_MATROSKA_CODEC_ID_AUDIO_VORBIS)) {
@@ -2427,6 +2428,7 @@ gst_matroska_demux_audio_caps (GstMatroskaTrackAudioContext * audiocontext,
         "mpegversion", G_TYPE_INT, mpegversion, NULL);
   } else {
     GST_WARNING ("Unknown codec '%s', cannot build Caps", codec_id);
+    g_print ("Codec=%s\n", codec_id);
     return NULL;
   }