clockoverlay issue in Gstreamer

[Hiep Huynh]

Hi,
I'm trying to add clockoverlay into my video stream.  However, the text
displayed is not correct (i.e. it shows "boxy" character instead of time
digits).  What's the issue? Fonts not found?  Please help.  I've attached
the screenshot (see text in top right corner of BBB stream).

Thanks for your help.
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