Usage of rtspsrc instead of uridecodebin

[ironman]

I am working on opencv gstreamer implementation and made a walktrough on the
code. Opencv creates the pipeline with this lines. 

#define COLOR_ELEM "ffmpegcolorspace"

uridecodebin = gst_element_factory_make("uridecodebin", NULL); 
g_object_set(G_OBJECT(uridecodebin), "uri", uri, NULL); 
pipeline = gst_pipeline_new(NULL); 
color = gst_element_factory_make(COLOR_ELEM, NULL); 
sink = gst_element_factory_make("appsink", NULL); 
gst_bin_add_many(GST_BIN(pipeline), uridecodebin, color, sink, NULL); 

The uridecodebin, pipeline, color and sink are declared as GstElement* at
the beginning. 

Now what I am trying to do is change the default latency (which is
2000msec). I have 2 questions: 

1)Is there a way to set the latency of the uridecodebin object by using
function g_object_set? 
2)I replaced the uridecodebin with the rtspsrc and tried the following lines
instead of the upper lines 
  
uridecodebin = gst_element_factory_make("rtspsrc", NULL); 
g_object_set(G_OBJECT(uridecodebin), "latency", 200, NULL); 
pipeline = gst_pipeline_new(NULL); 
my_new_pipe= gst_element_factory_make("decodebin2", NULL);  //I am using
gstreamer0.10 
color = gst_element_factory_make(COLOR_ELEM, NULL); 
sink = gst_element_factory_make("appsink", NULL); 
gst_bin_add_many(GST_BIN(pipeline), uridecodebin, my_new_pipe ,color, sink,
NULL); 

But it does not work. What is the wrong with this? How can I replace
uridecodebin part with the rtspsrc? 

Thanks in advance. 



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