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Remove background noise consistently?

I've got a video with many audio cuts. I want to remove background noise for all of them. But when I select all the clips and apply the "remove background noise" filter, it doesn't remove the noise at the start of each clip. That leaves me with a video where the background noise appears for the first fraction of the clip and then goes away, making it come and go annoyingly frequently.

Is there a way to avoid this? 

Using a MacMini, 5120x1440, Mac 12.0.1, SF 10.0.3

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  • Lessig  There are probably a few ways to do this. I use other software to remove background noise ... but I think my approach should work in your case. What I do (after editing) is I export the audio as a WAV file. (Then I run through my other software.) Once I'm done with the audio I then add it to the media drawer. Then I drag into the timeline and I activate that track and de-activate the track with the edited audio. Then if you run your "remove background noise" filter it should work just fine as it's working with one clip. 

    When you export it's crucial that you do so as lossless. (or uncompressed). Otherwise you'll experience some degradation in audio quality.

    I'm sure there may be other ways to do this, but this is one that should work for you.

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      • Lessig
      • Lessig
      • 10 mths ago
      • Reported - view

      Mathew Mitchell This is a brilliant solution! Thanks. 

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    • Lessig Glad it was helpful! CraigS  may end up having a better & more efficient solution for you but at least you have "something" you can use.

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      • Lessig
      • Lessig
      • 10 mths ago
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      Mathew Mitchell Thanks. And can you share what software you use to remove the background noise outside of ScreenFlow? 

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    • Lessig I use one of 2 products: iZotope RX or TwistedWave. RX is pretty expensive software, and likely not needed by you. But it's great. TwistedWave is an audio editor with some very nice added functions. 

      The developer of TwistedWave suggests 2 ways of doing this. Here's what he wrote to me awhile back:

      "You can either use the silence detector in "Select > Detect Silences..." from the main menu. Configure it to select the parts you want to process. When you have selected all the silences, you can either select "Effect > Amplify..." to reduce the level of these parts, or paste a sample of room tone you have copied previously to replace all the silences with some room tone. If you want to paste the room tone without changing the duration of the silences, you can use the "Special Paste" instead, configured in "Replace" mode, and with the attenuation set to -oo.

      The other way to do that is with a noise gate. You can find one in the main menu in "Effects > AudioUnits & VST > Apple > AUDynamicsProcessor". In the factory presets, you have a light, a medium and a hard noise gate."

      I'm not sure this will be helpful to you ... but I use TwistedWave's Effect>Amplify approach most of the time.

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      • Lessig
      • Lessig
      • 10 mths ago
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      Mathew Mitchell this is super helpful. thank you!

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    • CraigSModerator
    • Telestream Desktop Forum Moderator
    • CraigS
    • 10 mths ago
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    Lessig said:
    That leaves me with a video where the background noise appears for the first fraction of the clip and then goes away,

     Can you provide an example so we can hear what's happening and work on improving it?
    Are these imported clips (and what type) or capture audio? That might be signficant.

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      • Lessig
      • Lessig
      • 10 mths ago
      • Reported - view

      CraigS Sure. Here's a short bit from the video. The video is showing each of these (CPU, motherboard, powersupply, GPU) and you can hear the background noise at each cut even through they all have the same reduction. 

      • CraigSModerator
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      • CraigS
      • 10 mths ago
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      Lessig We need a visual example so we know the kinds of clips being affected. Please answer my questions.

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      • Lessig
      • Lessig
      • 10 mths ago
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      CraigS What you said was " Can you provide an example so we can hear what's happening." That's what I provided — the audio clips that have the background noise incompletely removed. Those audio clips are separate from the video clips — they were recorded on a separate track. So I have "answer[ed your] questions," but I'd be happy to provide unrelated video if you could suggest to me how that could possibly matter? I see the same problem if I remove all video from the document. 

      The clips were recorded as the video was recorded, and are synced to the video. They were .aifc. 

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      • CraigSModerator
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      • CraigS
      • 10 mths ago
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      Lessig Again we need to be clear about the audio source. Your example would not be clear to the developers. They need to see the source of the audio as ScreenFlow recorded audio may be different than imported clips. Sorry, but a clear visual example is necessary for the developers to investigate.

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  • 10 mths agoLast active
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