diff --git a/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp b/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp
index 6b7792c4428..d69c6ef1c5e 100644
--- a/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp
+++ b/mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp
@@ -1048,6 +1048,8 @@ bool MPEGStreamData::ProcessTSPacket(const TSPacket& tspacket)
 
     if (IsVideoPID(tspacket.PID()))
     {
+        QMutexLocker locker(&m_listenerLock);
+
         for (auto & listener : m_tsAvListeners)
             listener->ProcessVideoTSPacket(tspacket);
 
@@ -1056,6 +1058,8 @@ bool MPEGStreamData::ProcessTSPacket(const TSPacket& tspacket)
 
     if (IsAudioPID(tspacket.PID()))
     {
+        QMutexLocker locker(&m_listenerLock);
+
         for (auto & listener : m_tsAvListeners)
             listener->ProcessAudioTSPacket(tspacket);