Index: apps/metadata/mp4.c
===================================================================
--- apps/metadata/mp4.c	(revision 23643)
+++ apps/metadata/mp4.c	(working copy)
@@ -53,6 +53,7 @@
 #define MP4_gnre MP4_ID('g', 'n', 'r', 'e')
 #define MP4_hdlr MP4_ID('h', 'd', 'l', 'r')
 #define MP4_ilst MP4_ID('i', 'l', 's', 't')
+#define MP4_isom MP4_ID('i', 's', 'o', 'm')
 #define MP4_M4A  MP4_ID('M', '4', 'A', ' ')
 #define MP4_M4B  MP4_ID('M', '4', 'B', ' ')
 #define MP4_mdat MP4_ID('m', 'd', 'a', 't')
@@ -568,7 +569,7 @@
                 size -= 4;
                 
                 if ((id != MP4_M4A) && (id != MP4_M4B) && (id != MP4_mp42) 
-                    && (id != MP4_qt) && (id != MP4_3gp6))
+                    && (id != MP4_qt) && (id != MP4_3gp6) && (id != MP4_isom))
                 {
                     DEBUGF("Unknown MP4 file type: '%c%c%c%c'\n", 
                         (int)(id >> 24 & 0xff), (int)(id >> 16 & 0xff),
Index: apps/codecs/libm4a/demux.c
===================================================================
--- apps/codecs/libm4a/demux.c	(revision 23643)
+++ apps/codecs/libm4a/demux.c	(working copy)
@@ -66,7 +66,8 @@
         (type != MAKEFOURCC('M','4','B',' ')) &&
         (type != MAKEFOURCC('m','p','4','2')) &&
         (type != MAKEFOURCC('3','g','p','6')) &&
-        (type != MAKEFOURCC('q','t',' ',' ')))
+        (type != MAKEFOURCC('q','t',' ',' ')) &&
+        (type != MAKEFOURCC('i','s','o','m')))
     {
         DEBUGF("not M4A file\n");
         return;