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I'm using fingerprinting techniques to detect duplicate audio files on my music library.

The first and easy step is to compare the file-size and if they match I use a md5 sum to compare them.

The problem is sometimes the meta-tags of an audio file have been modified. So I compare the length (in seconds) of the file and if they match I use fpcalc to compare them.

When I finally have two audio files with different md5 sums but the same result of fpcalc I use picard (musicbrainz) to normalize the meta-tags (removing any tag that isn't a "standard" tag). Sometimes after saving the audio files they become identical but sometimes they are just different.

  • Can I use fpcalc to tell that two files have the same audio with the same quality?
  • If not, are there any other tools to compare audio files?

I made a small script to make all this easier https://github.com/falkartis/duplicates

If you think I'm doing it wrong can you please tell me.

In my collection I have lots of different file-types like wav, flac, ogg, mp3, wma...

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    $\begingroup$ What is fpcalc? $\endgroup$ – MBaz Jun 7 '16 at 21:54
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    $\begingroup$ It's a command line tool to make an acoustic fingerprint of an audio file. Musicbrainz/Picard uses it to fingerprint audio files and lookup the correct tags for the track. It's like shazam or soundhound. Should I add this to my question? $\endgroup$ – Falk Jun 7 '16 at 23:02
  • $\begingroup$ yes, you should. You see, this website is a bit about signal processing as in "we're the ones that do the signal processing library, not the ones that use that library"; so maybe we can help you, but every bit of knowledge about the algorithm employed by fpcalc would surely help. I don't think anyone of us has used it, and frankly looking up what algorithms it uses so we can answer your question might be a bit much to ask. $\endgroup$ – Marcus Müller Jun 7 '16 at 23:16
  • $\begingroup$ I see, maybe I'm asking at the wrong place. I tried to understand the algorithm myself, but I'm not smart enough (yet) that's why I asked. $\endgroup$ – Falk Jun 8 '16 at 9:12

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