diff -ru a/source/encoder/encoder.cpp b/source/encoder/encoder.cpp
--- a/source/encoder/encoder.cpp	2016-01-24 22:16:50.000000000 -0700
+++ b/source/encoder/encoder.cpp	2016-02-21 09:02:20.443636332 -0700
@@ -361,7 +361,10 @@
     }
 
     if (m_threadPool)
-        m_threadPool->stopWorkers();
+    {
+        for (int i = 0; i < m_numPools; i++)
+            m_threadPool[i].stopWorkers();
+    }
 }
 
 void Encoder::destroy()