# in idvid
        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 <<<  ${AUDIO_NCH[chn]}; then
                ID_AUDIO_NCH[chn]=6
            else
                ID_AUDIO_NCH[chn]=2
            fi
        done
        ID_AUDIO_NCH=${ID_AUDIO_NCH[@]}
        ID_AUDIO_NCH=${ID_AUDIO_NCH// /,}


# output
$ ffmpeg -i "$FILE" 2>&1 | grep Audio:
2>&1 |grep Audio:
    Stream #0.1(eng): Audio: mpeg4aac, 48000 Hz, 5:1
    Stream #0.2(ger): Audio: mpeg4aac, 48000 Hz, 5:1
    Stream #0.8(ces): Audio: mpeg4aac, 48000 Hz, stereo
    Stream #0.9(hun): Audio: mpeg4aac, 48000 Hz, stereo
    Stream #0.13(pol): Audio: mpeg4aac, 48000 Hz, stereo

$ idvid -fast -terse "$FILE"
ID_VIDEO_WIDTH=704
ID_VIDEO_HEIGHT=416
V_DURATION=6369
ID_VIDEO_FPS=25.000
ID_VIDEO_FORMAT=avc1
ID_AUDIO_CODEC=faad
ID_VIDEO_BITRATE=1390000
ID_AUDIO_BITRATE=202648
ID_AUDIO_NCH=6,6,2,2,2
ID_AUDIO_TRACKS=0.1,0.2,0.8,0.9,0.13
ID_AUDIO_RATE=48000
V_ASPECT_WIDTH=235
ID_VIDEO_FRAMES=0