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  1. Hello!

    I would like to replace the audio of an MP4 video with another aac audio file and split the video.

    I tried to do it with AviDemux but for some reason it keeps crashing. Then, I tried with VirtualDub2 but I get the message that I must choose another input driver.

    What am I missing? Is there some other (free) tool to do this?

    Thanks!
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  2. Member budwzr's Avatar
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    Apr 2007
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    City Of Angels
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    AAC? Isn't that Apple? What you're missing is that AAC is proprietary. You need to convert to non-Apple codec.
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  3. Member hech54's Avatar
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    Jul 2001
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    Yank in Europe
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    Once you get the audio straightened out....replace the audio and create a new file....THEN split the new file.
    Don't make the software try to decide whether to wind it's butt or scratch it's watch.
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  4. Thanks guys!

    The Mp4 video I have has already an aac sound. And I want to replace it with another one of the same format.

    Ok, let's say that I break the whole process in two steps. Which tool should I use for each process?
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  5. Member
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    Mar 2008
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    United States
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    With the tools I'm currently aware of, I'd use mkvtooknix to create an mkv with the streams I want,
    then turn it back to an mp4 after it was done. The task shouldn't be this hard
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  6. Map the audiostream using ffmpeg

    ffmpeg -i original.mp4 -i new.aac -c copy -map 0:v:0 -map 1:a:0 output.mp4
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  7. These two methods will reencode?
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  8. Member
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    Mar 2008
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    United States
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    The option I mentioned does not; I don't think the ffmpeg method does, but you should try it and see
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  9. The ffmpeg method doesn't re-encode either. It keeps the original video stream and simply replaces the audio stream in the mp4 container.
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