Blank kms screen before starting gstreamer video on kmssink

[Rainer Dorsch <ml@bokomoko.de>]

Hello,

I run a gstreamer pipeline like

gst-launch-1.0 filesrc location=$filename ! matroskademux name=d ! queue ! 
h264parse ! v4l2h264dec ! kmssink d. ! queue ! opusdec ! audioconvert ! 
audioresample ! autoaudiosink

which uses the hardware decoder on the NXP i.MX6 SoC.

The problem I have is that for videos which do not match the aspect ratio of 
the screen (e.g. 1280x720 video on 1280x1080 screen) there is still console 
text visible on the portion of the screen which is not overlayed with the 
gstreamer video output.

Does anybody know how I can blank the kms screen in shell script, before the 
script starts gstreamer?

Any hint or idea is welcome.

Thanks
Rainer

-- 
Rainer Dorsch
http://bokomoko.de/