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[Andrey Nechypurenko]

> Suppose I don't wanna use playbin2.

I am not sure that I understand your question completely, but what
might be helpful is to start your current playbin2-based working
pipeline using gst-launch, dump it and build the graph as described
here: http://gstreamer.freedesktop.org/wiki/DumpingPipelineGraphs
It will show you what playbin2 constructs under the hood for your
particular case. Then you can try to build similar pipelines in your
application and set corresponding properties of the elements.