time length of an mp3 file

Question

What is the simplest way to determine the length (in seconds) of a given mp3 file, without using outside libraries? (python source highly appreciated)

Answer 1

You can use pymad. It's an external library, but don't fall for the Not Invented Here trap. Any particular reason you don't want any external libraries?

import mad

mf = mad.MadFile("foo.mp3")
track_length_in_milliseconds = mf.total_time()    

Spotted here.

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If you really don't want to use an external library, have a look here and check out how he's done it. Warning: it's complicated.