diff --git a/FrameGrabber.cpp b/FrameGrabber.cpp
index 4ba12e7..69cad79 100644
--- a/FrameGrabber.cpp
+++ b/FrameGrabber.cpp
@@ -379,11 +379,6 @@ void FrameGrabber::addFrame (GstBuffer *buffer, GstCaps *caps)
     if (buffer == nullptr)
         return;
 
-    // first time initialization
-    if (pipeline_ == nullptr) {
-        initializer_ = std::async( FrameGrabber::initialize, this, caps);
-    }
-
     // initializer ongoing in separate thread
     if (initializer_.valid()) {
         // try to get info from initializer
@@ -412,6 +407,10 @@ void FrameGrabber::addFrame (GstBuffer *buffer, GstCaps *caps)
             }
         }
     }
+    // first time initialization
+    else if (pipeline_ == nullptr) {
+        initializer_ = std::async( FrameGrabber::initialize, this, caps);
+    }
 
     // stop if an incompatilble frame buffer given after initialization
     if (initialized_ && !gst_caps_is_subset( caps_, caps ))