Is there any free tool capable of doing the job?
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3 Answers
You didn't supply very much information, such as your OS and your desired output format, so I can not give you a detailed answer.
CAF is a container format that can support several audio formats, but Apple Lossless (ALAC) is probably the most common.
ffmpeg can decode ALAC in CAF:
ffmpeg -i input.caf output.wav
This can be turned into a "batch" command with a Bash "for loop".
for f in *.caf; do ffmpeg -i "$f" "${f%.caf}.wav"; done
sox can be added to this example to normalize your audio:
for f in *.caf; do ffmpeg -i "$f" -f sox - | sox --norm=-3 -t sox - "${f%.caf}.wav"; done
As usual, using a recent ffmpeg is recommended since development is so active. See the FFmpeg download page for various methods to acquire it.
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I think that is exactly what I needed. I did a little Googling, and it turns out that ffmpeg and sox are compatible with most platforms, included mine (Mac OS X), thanks very much– rraallvvCommented Nov 18, 2012 at 7:56
Sox is great as some above mentioned, I'd check out Sample Manager by audiofile engineering though. It's cheap and awesome. I use it nearly every day.
OSX?
AFCONVERT(1) BSD General Commands Manual
NAME
afconvert -- Audio File Convert
SYNOPSIS
afconvert [-h] src_audiofile dest_audiofile
DESCRIPTION
Audio File Convert will convert a source audio file to a new audio file
with the specified file and data types
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hi georgi - this doesn't cover off the normalisation part of the question.– Rory Alsop ♦Commented Feb 28, 2014 at 11:54
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true.. i didn't pay attention to the "normaliser" part of the question. that said, the accepted answer also uses another third party tool (sox) to normalise the sounds. i meant to point out that ffmpeg is overkill.– georgiCommented Feb 28, 2014 at 16:44