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sjmarky
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Joined: August 28th, 2006, 8:47 pm
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Post by sjmarky » June 15th, 2021, 7:59 am

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. Your audio is in stereo and only 69.3db.

I'm not sure what the "online audio converter" is, so I don't know if the standard Audacity advice works, or even if you are using Audacity as part of your process. However you are doing it, you need to produce a mono file with volume between 86db and 92db.

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.

When exporting your MP3 from Audacity, be sure to first check Bit Rate Mode - Constant, then select 128kb from the pull-down menu, and check Force Export to Mono.

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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