diff --git a/lib/rbcodec/codecs/libm4a/demux.c b/lib/rbcodec/codecs/libm4a/demux.c
index 3bf46ef..6ed8756 100644
--- a/lib/rbcodec/codecs/libm4a/demux.c
+++ b/lib/rbcodec/codecs/libm4a/demux.c
@@ -65,7 +65,8 @@ static void read_chunk_ftyp(qtmovie_t *qtmovie, size_t chunk_len)
         (type != MAKEFOURCC('m','p','4','2')) &&
         (type != MAKEFOURCC('3','g','p','6')) &&
         (type != MAKEFOURCC('q','t',' ',' ')) &&
-        (type != MAKEFOURCC('i','s','o','m')))
+        (type != MAKEFOURCC('i','s','o','m')) &&
+        (type != MAKEFOURCC('M','4','A','\0')))
     {
         DEBUGF("not M4A file\n");
         return;
@@ -425,6 +426,7 @@ static bool read_chunk_stco(qtmovie_t *qtmovie, size_t chunk_len)
 {
     uint32_t i, k, old_i;
     uint32_t numentries;
+    uint32_t table_reduce_factor;
     uint32_t idx = 0;
     uint32_t frame;
     uint32_t offset;
@@ -440,9 +442,12 @@ static bool read_chunk_stco(qtmovie_t *qtmovie, size_t chunk_len)
     numentries = stream_read_uint32(qtmovie->stream);
     size_remaining -= 4;

-    qtmovie->res->num_lookup_table = numentries;
-    qtmovie->res->lookup_table = malloc(numentries * sizeof(*qtmovie->res->lookup_table));
-
+    for (i = 0; !qtmovie->res->lookup_table; ++i) {
+      qtmovie->res->lookup_table = malloc((numentries >> i) * sizeof(*qtmovie->res->lookup_table));
+    }
+    table_reduce_factor = i > 0 ? i - 1 : 0;
+    qtmovie->res->num_lookup_table = numentries >> table_reduce_factor;
+
     if (!qtmovie->res->lookup_table)
     {
         DEBUGF("stco too large to allocate lookup_table[]\n");
@@ -489,10 +494,11 @@ static bool read_chunk_stco(qtmovie_t *qtmovie, size_t chunk_len)
             frame += (new_first - old_first) * old_frame;
         }
         frame += (k - old_first) * old_frame;
-
-        qtmovie->res->lookup_table[idx].sample = frame;
-        qtmovie->res->lookup_table[idx].offset = offset;
-        idx++;
+        if (!(k % (1 << table_reduce_factor))) {
+            qtmovie->res->lookup_table[idx].sample = frame;
+            qtmovie->res->lookup_table[idx].offset = offset;
+            idx++;
+        }

         frame -= (k - old_first) * old_frame;

diff --git a/lib/rbcodec/metadata/mp4.c b/lib/rbcodec/metadata/mp4.c
index 6973d3a..d1fc6f4 100644
--- a/lib/rbcodec/metadata/mp4.c
+++ b/lib/rbcodec/metadata/mp4.c
@@ -605,7 +605,7 @@ static bool read_mp4_container(int fd, struct mp3entry* id3,

                 if ((id != MP4_M4A) && (id != MP4_M4B) && (id != MP4_mp42)
                     && (id != MP4_qt) && (id != MP4_3gp6) && (id != MP4_m4a)
-                    && (id != MP4_isom))
+                    && (id != MP4_isom) && id != 1295270144)
                 {
                     DEBUGF("Unknown MP4 file type: '%c%c%c%c'\n",
                         (int)(id >> 24 & 0xff), (int)(id >> 16 & 0xff),