I have since created a shell script that deletes partial encodings after a power outage or reboot. The script combines my previous posting command lines into one user job. I call my script DVB2DVD.sh

#!/bin/bash
file=$1;

# Remove any temporary encodings from an unclean restart or reboot

rm -f /myth/tv/tmp/*.mpg

# Convert DVB to DVD

nuvexport --nice 17 --infile /myth/tv/$file --mode DVD --path /myth/tv/tmp/ --force-aspect=1.7777
if [ "$?" -ne "0" ]; then
echo "nuvexport terminated abnormally"
exit 1
fi

# Overwrite original recording with new encoding

mv -f /myth/tv/tmp/*.mpg /myth/tv/$file

# Rebuild keyframes for smooth FF & RR

mythcommflag --file /myth/tv/$file --sleep --rebuild