diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index d0f42cc..910ae32 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1168,6 +1168,11 @@
                 return ERROR_IO;
             }
 
+            if (!timescale) {
+                ALOGE("timescale should not be ZERO.");
+                return ERROR_MALFORMED;
+            }
+
             mLastTrack->timescale = ntohl(timescale);
 
             // 14496-12 says all ones means indeterminate, but some files seem to use
@@ -2635,6 +2640,11 @@
         return ERROR_MALFORMED;
     }
 
+    if (track->timescale == 0) {
+        ALOGE("timescale invalid.");
+        return ERROR_MALFORMED;
+    }
+
     return OK;
 }