1 Minute Test

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Post by Zanakon » June 16th, 2021, 10:44 am


Recording software: Audacity
Operating system: Windows
Mic type: USB (Blue Snowball)

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Joined: August 28th, 2006, 8:47 pm
Location: Poictesme

Post by sjmarky » June 16th, 2021, 11:18 am

Hi Kevin

I reviewed your test sample and some changes are needed. LibriVox requires audio that is 128kbps constant bit rate, 44.1kHz sample rate, mono, and between 86db and 92db, preferably 89-90. Everything is correct except the volume, which is much too low at 76.1db.

First, if you have a gain control on your mic, adjust it so your raw recording has wave forms that peak at about the 0.5 marks in the Audacity window. If necessary, adjust the volume level before exporting by going to Filters>Amplify. An alternative is to use Filters>Normalize, choose peak and set it to -3 or -4db.

You can check your audio yourself by downloading the free Checker app: https://cgjennings.ca/projects/checker/

Please record a new test with the same file name and post it as a reply. I’ll return and review it for you.
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Post by Zanakon » June 16th, 2021, 4:57 pm

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Post by Zanakon » June 17th, 2021, 1:07 pm

Is this good?

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Post by mightyfelix » June 18th, 2021, 12:55 pm

The volume on this one is still a bit low. I think what's causing the problem here is that you have a couple of very high peaks, spots where the volume is higher than the rest of the recording. So while those peaks may be in the right range, the overall volume is still low. It's much better than it was, and almost there. I'd recommend running the compressor on this recording before adjusting the volume. Here's a video that explains the compressor: http://www.youtube.com/watch?v=wJ3lOTDsN6c Basically, it lowers the volume of the peaks without bothering the rest of the recording.

If you find that your recordings tend to have a lot of volume spikes in them, you may wish to use the compressor as part of your normal editing process.

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