if [[ -n $ID_AUDIO_ID ]]; then
            O=$IFS IFS=$'\n' AUDIO_NCH=($(grep Audio: "$SCRATCH_FILE")) IFS=$O
            for chn in ${!AUDIO_NCH[@]}; do
                # TODO flesh this out with other possibilities: 7.1 etc
                if grep -q 5:1 <<<  ${AUDIO_NCH[chn]}; then
                    ID_AUDIO_NCH[chn]=6
                elif grep -q channels <<< ${AUDIO_NCH[chn]}; then
                    num_chn=$(sed -r 's/.* ([0-9]+) channels.*/\1/' \
                    <<< ${AUDIO_NCH[chn]})
                    if test_is_number "$num_chn"; then
                        ID_AUDIO_NCH[chn]=$num_chn
                    else
                        ID_AUDIO_NCH[chn]=2
                    fi
                else
                    ID_AUDIO_NCH[chn]=2
                fi
            done
            ID_AUDIO_NCH=${ID_AUDIO_NCH[@]}
            ID_AUDIO_NCH=${ID_AUDIO_NCH// /,}
        fi