No Facial Detection Ubuntu 18.04

Martin Vachovski Martin.Vachovski at
Tue Sep 11 13:06:00 UTC 2018

Hi Timm,

I think you should make sure you have the "profiles" for face/nose/mouth etc.

These are the Haar features that OpenCV uses for the face detection.

You can specify them with

... ! facedetect profile=[path] ! ...

According to

gst-inspect-1.0 facedetect

The default path is:


As a first check. See if you have that file




From: gstreamer-devel <gstreamer-devel-bounces at> on behalf of Timm Murray <tmurray at>
Sent: Tuesday, September 11, 2018 12:06 AM
To: Discussion of the development of and with GStreamer
Subject: No Facial Detection Ubuntu 18.04

I'm using the following pipeline for facial detection:

gst-launch-1.0 v4l2src device=/dev/video0 \
   ! 'video/x-raw,width=640,height=480' \
   ! videoconvert \
   ! facedetect \
   ! videoconvert \
   ! xvimagesink

This should display the video stream from my web cam to a window, with faces highlighted.  It does show the stream, but it's not drawing boxes around the faces.

I think something with my environment might be messed up, as the same pipeline had worked for me in the past.  Just not sure where to start looking.  This is on Ubuntu 18.04, GStreamer 1.14.1, and OpenCV 3.2.0.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the gstreamer-devel mailing list