diff --git a/uvcengine/uvccamerasession.cpp b/uvcengine/uvccamerasession.cpp
index 40c46b0d2e8eefdaf61b2a881b10d10631ec3c4b..98f17249899128f77b6601d341526aebe6b1ddf1 100644
--- a/uvcengine/uvccamerasession.cpp
+++ b/uvcengine/uvccamerasession.cpp
@@ -3,7 +3,8 @@
 QMutex UVCCameraSession::sessionMutex;
 
 UVCCameraSession::UVCCameraSession(QObject *parent)
-    : m_surface(Q_NULLPTR),
+    : QObject(parent),
+      m_surface(Q_NULLPTR),
       streaming(false),
       dev(NULL),
       devh(NULL)
@@ -135,7 +136,7 @@ bool UVCCameraSession::startPreview()
         return false;
     }
 
-    res = uvc_stream_start(strmh, cb, (void*) this, 1.5f, 0);
+    res = uvc_stream_start(strmh, cb, (void*) this, 1.3f, 0);
     if (res != UVC_SUCCESS) {
         qWarning() << "uvc_stream_start" << uvc_strerror(res);
         return false;