can't connect the "decodebin" to pipeline

[Dudi.r]

Hi,

Im trying to build pipeline that transmit video, it works fine with
"gst-launch" but not on code.
the problem is "decodebin2". I don't know why but it can't be connected.

this is the pipeline:
  filesrc location=movie.mp4 ! decodebin2 ! x264enc ! rtph264pay ! udpsink
port=61643


this is the part of the code:

  pipeline = gst_pipeline_new ("pipeline")

  src = gst_element_factory_make ("filesrc", "src"); 
  decbin=gst_element_factory_make ("decodebin2", "decbin"); 
  encoder = gst_element_factory_make ("x264enc", "encoder"); 
  rtppay = gst_element_factory_make ("rtph264pay", "rtppay"); 
  sink = gst_element_factory_make ("udpsink", "sink"); 

  g_object_set(G_OBJECT(src),"location","movie.mp4",NULL);
  g_object_set(G_OBJECT(sink),"port",61643,NULL);

  gst_bin_add_many (GST_BIN (pipeline), src, decbin, encoder, rtppay, sink,
NULL);

  if (gst_element_link_many ( src, decbin, encoder, rtppay , sink, NULL) !=
TRUE)    
   {
       g_printerr ("Elements could not be linked.\n");
       gst_object_unref (pipeline);
       return 0;
    }

if someone know why is the decodebin2 can't be connected it will be great!
thanks..



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