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  1. Member
    Join Date
    Apr 2004
    Location
    United States
    Search Comp PM
    Is there a way to take an mp4 file with aac audio, edit the audio volume so certain parts are louder, some are quieter (say I just want to mute a section), without transcoding/re-encoding the video stream? I don't really care if the audio has to be re-encoded.

    I'm sure something like Premiere could do this, but are there any free/cheap tools that'll do the job?

    Here's the media info for a file I'm working with, in case it helps:
    Click image for larger version

Name:	media-info.jpg
Views:	281
Size:	162.6 KB
ID:	27782

    Thanks!
    Last edited by Brent212; 1st Oct 2014 at 00:41. Reason: added media info screencap
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  2. Member turk690's Avatar
    Join Date
    Jul 2003
    Location
    ON, Canada
    Search Comp PM
    It's possible to do that by
    • demuxing the clip into its audio and video streams with, say, MP4Box
    • opening the audio stream in Audacity and do a combination of limiting and dynamic range compression, then saving to another audio file
    • remuxing saved processed new audio clip with the video to create new MP4 file
    For the nth time, with the possible exception of certain Intel processors, I don't have/ever owned anything whose name starts with "i".
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  3. Member
    Join Date
    Apr 2004
    Location
    United States
    Search Comp PM
    Cool, I'll give that a try, thanks.
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  4. Member hech54's Avatar
    Join Date
    Jul 2001
    Location
    Yank in Europe
    Search Comp PM
    You may be able to just drag the video file into GoldWave without demuxing. It will decompress only the audio to a workable WAV file.
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