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TOPIC: Audio spike at a cut

Re: Audio spike at a cut 2 years, 2 months ago #125107

  • RWAV
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What happens if the audio is converted to .wav before ingest into LW?
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Re: Audio spike at a cut 2 years, 2 months ago #125108

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I also downloaded the file - here this seems to have nought to do with LW but can be very easily fixed in LW.

I can hear a recorded audio anomaly at the 10:34 area in LW, VLC and Quicktime Player. It is easily removed by placing empty cuts around the 'spike' and slipping the audio until the silence before the spike replaces the spike. A very basic NLE edit trimming idea.

Please see the attached.

@donkpow - maybe a mike switch or just a bit of handling noise??
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Re: Audio spike at a cut 2 years, 2 months ago #125109

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If it isn't in the source, I really don't know.
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Re: Audio spike at a cut 2 years, 2 months ago #125115

  • RWAV
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What I'm saying is - it is in the source - here anyway - as the source is played in three pieces of software LW, VLC, Quicktime the spike is there. It may be that the OP's reference to a cut point threw us all off the track - but as guidance for the OP - if one is simply wishing to drop/raise the overall level of a clip - the gain slider is safer to use - it will not place any audio nodes - as soon as you access the dynamic 'level' slider is is prudent to check the status of audio nodes - errors can be made.

The other issue to consider - I downloaded the 60fps 720p HD version - other downloads may be different simply because of the difference in YouTube encoding??

I was going to muck about with setting different project parameters in LW - but life's too short - so what I have posted is for a 60fps project with the project video format set to 720p 59.94fps - other combinations may sound different - but for this 'spike' event it would still remain.
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Re: Audio spike at a cut 2 years, 2 months ago #125119

  • donkpow
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I didn't look at it, file length is too long for me to look download. Give me just the audio and I'll look at it.

Consider the difference between "electronic" and "analog" noise. Electronic noise is created by a digital system so it is going to comply with the rules of electronic created things.
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Re: Audio spike at a cut 2 years, 2 months ago #125149

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This is audio only of the video above. The spike is visible at appr. 10:34.25 in Audacity.

I have trouble attaching the file to the web page, I stored it at Google Drive instead: drive.google.com/open?id=0B0gGXdDHD8pHSTlleE9mYTdFNDA
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Re: Audio spike at a cut 2 years, 2 months ago #125158

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Okay, then. I shall review it.
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Re: Audio spike at a cut 2 years, 2 months ago #125160

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donkpow wrote:
Okay, then. I shall review it.

You named it, you got it.
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Re: Audio spike at a cut 2 years, 2 months ago #125164

  • donkpow
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Here is the segment.
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Last Edit: 2 years, 2 months ago by donkpow.

Re: Audio spike at a cut 2 years, 2 months ago #125165

  • hugly
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Very nice!

Does this sound like an analogue or a digital spike to your experienced ears?
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Re: Audio spike at a cut 2 years, 2 months ago #125168

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Just started looking. Don't over estimate my ability. Look at all elements before judgement. I can tell you the third sound in the segment is not related to the noise (second sound). Listening in isolation, you might assume hum of the mains' frequency.
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Re: Audio spike at a cut 2 years, 2 months ago #125169

  • donkpow
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Here we have a comparison of the original audio and an attempt to silence the offending sound with a volume envelope.


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Re: Audio spike at a cut 2 years, 2 months ago #125173

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So far, my assumption is that the spike is caused by a switched analogue device further amplified and distorted by audio mixer pan sliders centered and already present in the original footage. I believe it is visible to the right of the cutpoint at A1,A2 in OP's screenshot above,
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Re: Audio spike at a cut 2 years, 2 months ago #125174

  • donkpow
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Here we see a frequency analysis of the noise. Recall previously, the noise is broad band in nature. Note below the obvious lack of natural harmonics in the noise.


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Re: Audio spike at a cut 2 years, 2 months ago #125178

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That's a very interesting screenshot. What program (or hardware) did you use for this?
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