LightWorks on Linux/MacOSX does produce random audio artifacts when rendering a project. This script is a workaround comparing three independent renderings to guess those that do not contain those artifacts.

compare.sh

#!/bin/bash


function usage() {
    echo Usage: $0 dir1 ...dirN [+GLOB] >&2
}

function fail() {
    echo $1 >&2
    usage
    exit 1
}

function perm() {
    for((i=0;i<$1;++i)); do
        for((j=$i+1;j<$1;++j)); do
            echo $i $j
        done
    done
}

[ $# -le 2 ] && fail

DIRS=( "$@" )
GLOB='*'
for((i = 0; i < ${#DIRS[@]}; ++i)); do
    d="${DIRS[i]}"
    case "$d" in
        +*) GLOB="${d:1}"
            unset DIRS[i]
            ;;
        *)  [ -d "$d" ] || fail "$d is not a directory"
    esac
done


# DIR A is assumed to be the "master" directory
(cd "${DIRS[0]}" ; find . -type f -name "${GLOB}" -print0) |
    while IFS= read -r -d $'\0' fpath ; do
        OK=""
        perm ${#DIRS[@]} | while read A B ; do
            if [ -z "$OK" ]
            then
                FA="${DIRS[$A]}/${fpath}"
                FB="${DIRS[$B]}/${fpath}"
                echo Comparing $FA and $FB

                if diff -q "${FA}" "${FB}" > /dev/null
                then
                    OK=1
                    echo "${FA}"
                fi
            fi
        done
        [ -z "$OK" ] || echo "No match for $fpath"
    done

merge.sh

#!/bin/bash

function usage() {
    echo Usage: $0 video.mp4 audio.wav destination
}

function fail() {
    {
        echo $0
        usage 
    } >&2
    exit 1
}

[ $# -ne 3 ] && fail "Bad argumant count"

EPISODE_ID=$(sed -Ee 's/.*?(EP[[:digit:]]+).*/\1/' <<< "$3")
YEAR=$(date +%Y)
DATE=$(date --rfc-3339=seconds)

case "$1" in
*.wav)  AUDIO="$1"
        VIDEO="$2"
        ;;
*)      VIDEO="$1"
        AUDIO="$2"
esac

ffmpeg -i "${VIDEO}" -i "${AUDIO}" -flags:v +global_header -vcodec copy \
    -metadata author="${AUTHOR:-Sylvain Leroux}" \
    -metadata copyright="Copyright (c) ${YEAR} ${AUTHOR:-Sylvain Leroux}" \
    -metadata year="${YEAR}" \
    -metadata title="${TITLE:-Yes, I Know IT !}" \
    -metadata genre="${GENRE:-Education}" \
    -metadata show="${SHOW:-Yes, I Know IT !}" \
    -metadata episode_id="${EPISODE_ID:-EP00}" \
    "$3"