textoverlay stops the video stream

[Sc4reCr0w]

Hello, I'm new with gstreamer. I work with some C code app. It opens
usb-camera and shows its live frames on monitor via gstreamer pipeline
Gstreamer pipeline is created with call:
....
pipeline = gst_parse_launch("appsrc is-live=TRUE name=streamViewer ! queue
max-size-buffers=2 leaky=2 ! ffmpegcolorspace ! videoscale add-borders=TRUE
! autovideosink", NULL);
....
So every frame from camera is saved to some buffer variable. This buffer
works as the source for appsrc.

I need to add some text to be displayed with video stream. I tried such
pipleline:
pipeline = gst_parse_launch("appsrc is-live=TRUE name=streamViewer ! queue
max-size-buffers=2 leaky=2 ! ffmpegcolorspace ! videoscale add-borders=TRUE
! textoverlay text="TEST" ! autovideosink", NULL);

but it displays only first frame captured from camera and didn't react on
all other received frames.
So I think I do something wrong but yet I don't find any solution on
Internet.
Can anyone help me with use of textoverlay in such set up with any ideas,
please ? 

Also I used cairotextoverlay and it worked on the half:
pipeline = gst_parse_launch("appsrc is-live=TRUE name=streamViewer ! queue
max-size-buffers=2 leaky=2 ! ffmpegcolorspace ! videoscale add-borders=TRUE
! cairotextoverlay text="TEST" ! autovideosink", NULL);
but I need several lines of text to be displayed. So 
pipeline = gst_parse_launch("appsrc is-live=TRUE name=streamViewer ! queue
max-size-buffers=2 leaky=2 ! ffmpegcolorspace ! videoscale add-borders=TRUE
! cairotextoverlay text="TEST\nOK" ! autovideosink", NULL);
displays '\n' as a rectangle and it doesn't break string into two lines. I
get 'TESTrectangleOK' but I need 
'TEST
OK'.
So if someone knows how does cairotextoverlay break text into separate
lines, tell me, please.

So help me, please, with this two problems.




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