Just continuing to try to diagnose this thing ...
sudo bbb-record --debug gives:
E, [2020-10-06T13:58:28.803604 #23497] ERROR -- : SIGTERM
E, [2020-10-06T13:58:28.803708 #23497] ERROR -- : /usr/local/bigbluebutton/core/lib/recordandplayback.rb:104:in `each_line'
E, [2020-10-06T13:58:28.803727 #23497] ERROR -- : /usr/local/bigbluebutton/core/lib/recordandplayback.rb:104:in `block in execute'
E, [2020-10-06T13:58:28.803740 #23497] ERROR -- : /usr/local/bigbluebutton/core/lib/recordandplayback.rb:103:in `popen'
E, [2020-10-06T13:58:28.803753 #23497] ERROR -- : /usr/local/bigbluebutton/core/lib/recordandplayback.rb:103:in `execute'
E, [2020-10-06T13:58:28.803765 #23497] ERROR -- : /usr/local/bigbluebutton/core/lib/recordandplayback.rb:119:in `exec_ret'
E, [2020-10-06T13:58:28.803777 #23497] ERROR -- : /usr/local/bigbluebutton/core/scripts/rap-process-worker.rb:80:in `block (2 levels) in process_archived_meetings'
E, [2020-10-06T13:58:28.803789 #23497] ERROR -- : /usr/local/bigbluebutton/core/scripts/rap-process-worker.rb:56:in `each'
E, [2020-10-06T13:58:28.803810 #23497] ERROR -- : /usr/local/bigbluebutton/core/scripts/rap-process-worker.rb:56:in `block in process_archived_meetings'
E, [2020-10-06T13:58:28.803825 #23497] ERROR -- : /usr/local/bigbluebutton/core/scripts/rap-process-worker.rb:30:in `each'
E, [2020-10-06T13:58:28.803838 #23497] ERROR -- : /usr/local/bigbluebutton/core/scripts/rap-process-worker.rb:30:in `process_archived_meetings'
E, [2020-10-06T13:58:28.803901 #23497] ERROR -- : /usr/local/bigbluebutton/core/scripts/rap-process-worker.rb:155:in `<main>'