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I have a large number of audio files, each of which contains the pronounciation of a certain word. I need to batch process these files such that they all sound equaly loud when I'm finished with them. I also wish to remove the short pauses that occur at the start and end of each file.

I am working on Mac Os X Mavericks but I can also do this on Windows 7.

Please state if your solution involves software which must be purchased.

Also, I can program using Python so if there is a command line solution which does not have a batch mode, I can probably program the batch part.

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What's the format of audio files? –  gronostaj Dec 14 '13 at 21:13
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1 Answer

Two options spring to mind:

  1. Audacity (free/open source + multiplatform) - provides batch processing of audio files using something called Chains. You can select from a list of effects, filters and edits. Here's a video example of the process. Check the Audacity docs for further information. MP3 support is provided as a separate (free) install depending on your OS - e.g. LAME encoder.

  2. Adobe Audition (paid + Windows/OSX) - Supports batch processing of audio files with multiple effects, filters, etc. More features and slicker interface than Audacity. Called Favourites in Audition this video gives a quick introduction to the system and this guide may help too.

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