Playbin + kmssink + aspect ratio black borders

[Daniel Rossi]

I am using kmssink to output video to HDMI on RPI. However, the video is 
overlaying the console text, with the text showing underneath it 
depending on the video scale.

In 16:9 on a TV it still shows text top and bottom but not on my 
monitor. In 4:3 it's apparantly forcing aspect ratio, and the console 
text is displaying underneath it .

Is there a way to force a black border using playbin ?

Example command

gst-launch-1.0 playbin -v video-sink="kmssink" uri=srt://:8888
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