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  1. Member
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    I've tried ffmpeg, nero, eac3to, tsmuxer, libav, qaac and megui. I have a 6 channel aac from a movie. I just want to demux it to 6 mono wavs. I keep getting the error the Nero Decoder 2 instance failed, no matter what I do, trying other versions, etc.
    In 2020 is there still no easy way to do this? Please advise. I'm on Win 10.
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  2. Member
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    Audacity with the FFmpeg add-on can do it.

    Set Preferences / import - export / use advanced mixing options.
    Open your file
    File / export/ export multiple
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  3. Member Cornucopia's Avatar
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    Have not verified this yet, but why don't you try doing it in 2 steps?:
    multichannel AAC -> multichannel WAV, and then
    multichannel WAV -> individual mono WAV files

    There seems to be a number of tools that should do that.


    Scott
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  4. You could try:
    ffmpeg -i in.aac -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -map "[FL]" front_left.wav -map "[FR]" front_right.wav -map "[FC]" front_center.wav -map "[LFE]" lfe.wav -map "[BL]" back_left.wav -map "[BR]" back_right.wav
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  5. Member
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    Originally Posted by ProWo View Post
    You could try:
    ffmpeg -i in.aac -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -map "[FL]" front_left.wav -map "[FR]" front_right.wav -map "[FC]" front_center.wav -map "[LFE]" lfe.wav -map "[BL]" back_left.wav -map "[BR]" back_right.wav
    Input #0, aac, from 'in.aac':
    Duration: 00:03:15.35, bitrate: 216 kb/s
    Stream #0:0: Audio: aac (LC), 48000 Hz, 5.1, fltp, 216 kb/s
    front_left.wav: Permission denied

    ?
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  6. Member
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    Originally Posted by davexnet View Post
    Audacity with the FFmpeg add-on can do it.

    Set Preferences / import - export / use advanced mixing options.
    Open your file
    File / export/ export multiple
    I can't locate the proper libraries for it...?
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  7. Originally Posted by takearushfan View Post
    Originally Posted by ProWo View Post
    You could try:
    ffmpeg -i in.aac -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -map "[FL]" front_left.wav -map "[FR]" front_right.wav -map "[FC]" front_center.wav -map "[LFE]" lfe.wav -map "[BL]" back_left.wav -map "[BR]" back_right.wav
    Input #0, aac, from 'in.aac':
    Duration: 00:03:15.35, bitrate: 216 kb/s
    Stream #0:0: Audio: aac (LC), 48000 Hz, 5.1, fltp, 216 kb/s
    front_left.wav: Permission denied

    ?
    You have to add a target path to all outputs, g.e. "D:\video\ front_left.wav"
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  8. Originally Posted by ProWo View Post
    You have to add a target path to all outputs, g.e. "D:\video\ front_left.wav"
    Or just put the aac file and batch file in a folder the CLI can write to.

    Try this minor modification in a batch file:

    Code:
    ffmpeg -i %1 -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -map "[FL]" "%~dpn1.front_left.wav" -map "[FR]" "%~dpn1.front_right.wav" -map "[FC]" "%~dpn1.front_center.wav" -map "[LFE]" "%~dpn1.lfe.wav" -map "[BL]" "%~dpn1.back_left.wav" -map "[BR]" "%~dpn1.back_right.wav"
    You can drag/drop any AAC file onto it and the output WAVs will be generated in the same folder as the AAC file. If you put the batch file in your SendTo folder with the name AAC2WAV.BAT you can right click on any AAC file and select Send To -> AAC322WAV.BAT.
    Last edited by jagabo; 29th Jul 2020 at 11:45.
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  9. Member
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    Originally Posted by takearushfan View Post
    Originally Posted by davexnet View Post
    Audacity with the FFmpeg add-on can do it.

    Set Preferences / import - export / use advanced mixing options.
    Open your file
    File / export/ export multiple
    I can't locate the proper libraries for it...?
    Just in case you may need it later ....
    https://manual.audacityteam.org/man/installing_ffmpeg_for_windows.html
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  10. Member hech54's Avatar
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    BeSweet and BeSweet GUI would have been my first choice.
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