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TOPIC: Audio spike at a cut

Re: Audio spike at a cut 1 year, 7 months ago #125230

  • RWAV
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Yes, with the information we have so far I think donkpow is right
The 'spike' we have been exploring is plainly and demonstrably present in the files dwonloaded from YouTube here four pieces of software play the 'spike' straight from the downloaded files. I downloaded the 2,569 Kb/s 371 Kb/s and 233 Kb/s versions from YouTube - it is on all of them.
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Re: Audio spike at a cut 1 year, 7 months ago #125237

  • donkpow
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Here's what Pandautz said in the first post:

The funny thing is: While in Lightworks, the spike is NOT there. It only appears when I export the video, and watch it in Media Player or on Youtube.


Here is what he says about the 10:45 video:

I tried to change the soft cut duration, all 3 possibilities, did not help...
Here is one of the videos with a cut:

<link>

(cut is at 10:34)
That is one of the less "strong" spikes.


That's the only video linked in this thread.
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Re: Audio spike at a cut 1 year, 7 months ago #125240

  • hugly
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Yes, but you can download different resolutions (bitrates) from youtube, view depending on download manger installed, one example.

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Re: Audio spike at a cut 1 year, 7 months ago #125243

  • donkpow
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Yes, it's the only video under question and it is a Lightworks export. Not a source video.

It's a narrow discussion limited to the question as to what causes the noise. The OP says it's not in the source material and not in the Lightworks edit. I don't know why we are talking about microphones, mixing panel, other people's videos, and all the other irrelevant items in the universe.
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Re: Audio spike at a cut 1 year, 7 months ago #125245

  • hugly
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Yes, you are perfectly right.

I tried but I wasn't able to reproduce the spike with a similar setup using different sources compressed and uncompressed with V12.6.

As mentioned, I assume that without additional information provided by OP we won't find out what has caused the spike.
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Last Edit: 1 year, 7 months ago by hugly.

Re: Audio spike at a cut 1 year, 7 months ago #125273

  • RWAV
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Apologies - my error thinking we were downloading the source footage. Of course donkpow is right no amount of staring at the resultant 'spike' will lead to reverse engineering it.

If I were the OP - one at a time I'd slide the cut points of the audio back a few frames - do a 10 second test export of each variation - almost bet one of those will remove or at least chnage it enough to isolate the culprit track - I'd start with the mic recorded VO.

hugly - I have six download options via Internet Download Manager the additional one is a 60fps version.
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Re: Audio spike at a cut 1 year, 7 months ago #125275

  • hugly
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I have six download options via Internet Download Manager the additional one is a 60fps version.

Lucky you, maybe this has something to do with location? If not, I'm going to shoot the developer of my download manager with a paintball next time I'll see him.
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Last Edit: 1 year, 7 months ago by hugly.

Re: Audio spike at a cut 1 year, 7 months ago #125276

  • donkpow
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Re: Audio spike at a cut 1 year, 7 months ago #125325

  • donkpow
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Just as a matter of completeness, I recommend converting all audio to a single format. Personally, I use BWF @ a bit depth of 16 and a sampling frequency of 48 kHz. It works across all programs and flawlessly in Lightworks. Just convert it, that's all.
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Re: Audio spike at a cut 1 year, 7 months ago #125348

  • RWAV
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There was a time when LW automatically converted all audio to .wav - in early EdisShare time new users could not see the point of that and complained - so that behaviour was modified to satisfy them.

Do hope all those who saw the simple automatic conversion as an 'inconvenience' are very happy with the revised arrangements.
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