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  1. I recorded a video capture using OBS studio. Unfortunately my computer mic was on and my voice is mixed in with the audio from the video. I would like to blot out my voice from the .mkv file with silence. I don't care if the audio from the video itself gets blotted out along with my voice for these small segments. Does anyone know how to do this using avidemux or any other kind of editor?

    My OS is Windows 10. Here's the file info from MediaInfo:


    Format : Matroska
    Format version : Version 4
    File size : 676 MiB
    Duration : 19 min 49 s
    Overall bit rate mode : Variable
    Overall bit rate : 4 763 kb/s
    Writing application : Lavf58.20.100
    Writing library : Lavf58.20.100
    ErrorDetectionType : Per level 1

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.2
    Format settings : CABAC / 2 Ref Frames
    Format settings, CABAC : Yes
    Format settings, RefFrames : 2 frames
    Codec ID : V_MPEG4/ISO/AVC
    Duration : 19 min 49 s
    Bit rate mode : Variable
    Maximum bit rate : 40.0 Mb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 60.000 FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Default : Yes
    Forced : No
    Color range : Limited
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.470 System B/G

    Audio
    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : A_AAC-2
    Duration : 19 min 49 s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 44.1 kHz
    Frame rate : 43.066 FPS (1024 SPF)
    Compression mode : Lossy
    Delay relative to video : 3 ms
    Default : Yes
    Forced : No
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  2. Member
    Join Date
    Mar 2008
    Location
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    Basic audio editing?

    Use an audio editor - for example
    Audacity

    Load the audio file, zoom in (CTRL 1), mark the spot with the mouse,
    effects/amplify - set the amplification to about -50.
    Repeat as necessary

    File/export/save as Wav

    Load the original video in Avidemux, disable the original audio, load the new wave file
    Audio(on the left) / change from "copy" to aac/fdk

    Save the new file
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  3. Thanks! I've been able to do everything right up to the point where you say to load the new wave file. I can't figure out how to do that. In avidemux the audio tab at the top only gives me the option "Select Track" and the Audio Output on the left only has the different output formats. Could you or someone explain in a bit more detail how to load the new wave file?

    Oh, and here's a thread I found from 2012 (but interestingly last posted to only 2 days ago) that touches on a similar issue in case anyone reading this in the future wants to reference it.

    https://forum.videohelp.com/threads/344608-Insert-beep-audio-to-black-out-words-in-a-mp4-file
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  4. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    It's here:
    Image Attached Thumbnails Click image for larger version

Name:	add_aud.png
Views:	25
Size:	15.3 KB
ID:	56796  

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  5. Hey, it worked! Thanks a bunch! I was a little worried initially, because when I added the newly edited audio track and played it within avidemux before saving it, all I heard was loud static. Then after I saved it and played it in VLC, it sounded great - no A-V sync issues or anything. So thanks again!
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  6. Member Cornucopia's Avatar
    Join Date
    Oct 2001
    Location
    Deep in the Heart of Texas
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    Using fade outs & ins is workable, but it can sometime result in noticeable "pumping" much like a (manual) noise gate. It has "air"/ambience, then it doesn't, then it does again.

    Possibly better is to do what the pros do and drop in "room tone" aka silent ambience, in those gaps, doing micro-crossfades at the transitions. Often COMPLETELY hides the offending segments without notice.
    If you do this, I recommend you record along segment of room tone* with which to work, so you don't fall into the trap of needing to loop a short segment. That DOES become noticeable.

    Have done thousands of hours of that stuff, so I know it can work if properly acquired & matched.

    Scott

    *Get a recording for each room used, with exact same setup and levels as main recording, in order to best match.
    Last edited by Cornucopia; 19th Jan 2021 at 13:10.
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  7. Thanks for the additional advice Scott. Makes sense. Much appreciated.
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  8. Member netmask56's Avatar
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    Sep 2005
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    Sydney, Australia
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    As it's a MKV file you could just remux the fixed audio track back into the mkv file using MKVToolNix, no need for avidemux.
    BeyonWiz V2 PVR ~ Popcorn A-500 ~ Samsung ES8000 65" LED TV ~ Sony 75" X9500H ~ Windows 7 64bit ~ Yamaha RX-A1070 ~ QnapTS851-4G
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