Solved.
Upgraded to gstreamer 1.24.4, using instructions here:
https://www.linuxfromscratch.org/blfs/view/svn/multimedia/gstreamer10.html
BUT, with the setup flag gst_debug=true
This traces back to an issue with gstreamer debug symbols, patched here:
Output below:
```
$ debsums libgstreamer1.0-0
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstcoreelements.so OK
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstcoretracers.so OK
/usr/lib/x86_64-linux-gnu/gstreamer1.0/gstreamer-1.0/gst-plugin-scanner OK
Attached ldd output.
** Attachment added: "ldd_libwebkit2gtk-4.0.so.37"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2064682/+attachment/5777345/+files/ldd_libwebkit2gtk-4.0.so.37
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Desktop Bugs,
Public bug reported:
Gnome Control Center unable to launch. Suspicious of interaction with
libwebkit2gtk. Throws the following error on launch:
`gnome-control-center: symbol lookup error: /lib/x86_64-linux-
gnu/libwebkit2gtk-4.0.so.37: undefined symbol: GST_CAT_DEFAULT`
`nm -D` output for the