See the following error message from UndoDB:
ctx":"js","msg":"shell: Started program","attr":{"pid":"1665416","argv":["/home/ec2-user/live-record","-p","1.66541e+06"]}}
the format of the pid is not understood by live-record and so the recording doesn't start. This is bound to happen on systems that allow huge pid values (above 99999) with the current integration.