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Spurious pipeline state changes with dynamic-tee-vsink.c

Thanks so much for this example and your work in general.

Quick question here: I just added some state change debug to the pipeline bus loop:

--- dynamic-tee-vsink.c.old	2023-08-20 21:34:20
+++ dynamic-tee-vsink.c	2023-08-20 21:36:36
@@ -45,6 +45,15 @@
 message_cb (GstBus * bus, GstMessage * message, gpointer user_data)
 {
   switch (GST_MESSAGE_TYPE (message)) {
+    case GST_MESSAGE_STATE_CHANGED:{
+      if (GST_MESSAGE_SRC (message) == GST_OBJECT (pipeline)) {
+        GstState old_state, new_state, pending_state;
+        gst_message_parse_state_changed (message, &old_state, &new_state, &pending_state);
+        g_print ("Pipeline state changed from %s to %s (pending: %s)",
+          gst_element_state_get_name (old_state), gst_element_state_get_name (new_state), gst_element_state_get_name (pending_state));
+      }
+      break;
+    }
     case GST_MESSAGE_ERROR:{
       GError *err = NULL;
       gchar *name, *debug = NULL;

I am surprised to see pipeline state changes while the playback doesn't seem to be paused:

% ./dynamic-tee-vsink somevideo.mp4
Pipeline state changed from NULL to READY (pending: PLAYING)
Pipeline state changed from READY to PAUSED (pending: PLAYING)
Pipeline state changed from PAUSED to PLAYING (pending: VOID_PENDING)
add
added
Pipeline state changed from PAUSED to PAUSED (pending: PAUSED)
Pipeline state changed from PAUSED to PAUSED (pending: PLAYING)
Pipeline state changed from PAUSED to PLAYING (pending: VOID_PENDING)
remove
removed
add
added
Pipeline state changed from PAUSED to PAUSED (pending: PAUSED)
Pipeline state changed from PAUSED to PAUSED (pending: PLAYING)
Pipeline state changed from PAUSED to PLAYING (pending: VOID_PENDING)
remove
removed

Is there any reason the pipeline gets its state changed during the add operations (see the 3 lines after added), and why are there PAUSED to PAUSED state changes?

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