time length of an mp3 file

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.

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.

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