text overlay

[kususe]

I installed a Linux distro on VM and all works. 
Some days ago, I installed some packets about gstreamer and probably I made
a mess, causing a packet conflict. 
Now, I have another question. 

I wanna implement the text overlay, without using playbin, but reading
strings by a file and displaying them on the screen (I need modify their
alignment..). 
I start from a mpeg file. I demux it into two queue (audio and video) wich
ends up into their respective sinks. 
If I want to use the textoverlay, have I create another queue? If yes, what
element should I insert in it?
Is the text overlay sink equal to the video one? 
I attempted to set up the text to display, simple using the parameter
"text", but naturally it doesn't work, because something is wrong. 

Thanks in advance. 
Francesco

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