omxmjpegdec not working on Raspi 4?

[rookie1]

Just in case this is important, here are my gstreamer package versions on the
Raspi 4:

pi at raspberrypi:~ $ dpkg -l | grep gstreamer
ii  gir1.2-gstreamer-1.0:armhf           1.14.4-1                             
armhf        GObject introspection data for the GStreamer library
ii  gstreamer1.0-gl:armhf                1.14.4-2                             
armhf        GStreamer plugins for GL
ii  gstreamer1.0-omx                     1.14.4-1+rpt1                        
armhf        GStreamer OpenMAX plugins
ii  gstreamer1.0-omx-rpi                 1.14.4-1+rpt1                        
armhf        OpenMax plugins for GStreamer
ii  gstreamer1.0-omx-rpi-config          1.14.4-1+rpt1                        
armhf        OpenMax plugins for GStreamer
ii  gstreamer1.0-plugins-bad:armhf       1.14.4-1+b1                          
armhf        GStreamer plugins from the "bad" set
ii  gstreamer1.0-plugins-base:armhf      1.14.4-2                             
armhf        GStreamer plugins from the "base" set
ii  gstreamer1.0-plugins-good:armhf      1.14.4-1+rpt1                        
armhf        GStreamer plugins from the "good" set
ii  gstreamer1.0-plugins-ugly:armhf      1.14.4-1                             
armhf        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-tools                   1.14.4-1                             
armhf        Tools for use with GStreamer
ii  gstreamer1.0-x:armhf                 1.14.4-2                             
armhf        GStreamer plugins for X11 and Pango
ii  libgstreamer-gl1.0-0:armhf           1.14.4-2                             
armhf        GStreamer GL libraries
ii  libgstreamer-plugins-bad1.0-0:armhf  1.14.4-1+b1                          
armhf        GStreamer libraries from the "bad" set
ii  libgstreamer-plugins-base1.0-0:armhf 1.14.4-2                             
armhf        GStreamer libraries from the "base" set
ii  libgstreamer1.0-0:armhf              1.14.4-1                             
armhf        Core GStreamer libraries and elements
ii  libgstreamer1.0-dev:armhf            1.14.4-1                             
armhf        GStreamer core development files



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