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Audacity (free, GPL Win, Linux, Mac) to Normalize the audio if the m4b audiobook volume is too low. This is very rare that you'll encounter such a case.
First export from freac. In General Settings under Output filenames put
Filename pattern: <title>Each chapter will be encoded and output to matching the chapter name.
Uncheck
Encode to a single file
Encoder choose opus 32kbps or as high as the original bitrate as these files need to be re-encode three times in total.1) in Audacity import all chapter files at once. Select All (Ctrl-A) then
Effect | Normalize.
2) For that rare chapter if the wavelength doesn't go up like the rest double click on the track to highlight both tracks then Effect | Amplify
and choose an Amplification (db)
of whatever kind of matches the height of the other track waveforms.3)
File | Export | Export Multiple
and choose mp3 or ogg. Don't lower the bitrate lower than the original.Using Audacity seems a tad quicker to use for normalization than Ocenaudio next post.
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