Code Challenge 56 - Calculate the Duration of a Directory of Audio Files

PyBites, Tue 23 October 2018, Challenge

audio, challenges, code challenge, datetime, FFmpeg, glob, music, os.path, pathlib, subprocess

There is an immense amount to be learned simply by tinkering with things. - Henry Ford

Hey Pythonistas,

It's time for another code challenge! This week we're asking you to work with directory, files and audio meta data!

The Challenge

Write a script that receives a directory name and retrieves all mp3 (or mp4 or m4a) files. It then sums up the durations of each file and prints them in a nice table with a total duration.

This could look like the following:

    $ ~/Music/iTunes/iTunes\ Media/Music/Manu\ Chao/Manu\ Chao\ -\ Esperanza/
    Manu Chao - Bixo.m4a                    : 112
    Manu Chao - Denia.m4a                   : 279
    Manu Chao - El Dorrado 1997.m4a         : 89
    Manu Chao - Homens.m4a                  : 198
    Manu Chao - Infinita Tristeza.m4a       : 236
    Manu Chao - La Chinita.m4a              : 93
    Manu Chao - La Marea.m4a                : 136
    Manu Chao - La Primavera.m4a            : 112
    Manu Chao - La Vacaloca.m4a             : 143
    Manu Chao - Le Rendez Vous.m4a          : 116
    Manu Chao - Me Gustas Tu.m4a            : 240
    Manu Chao - Merry Blues.m4a             : 216
    Manu Chao - Mi Vida.m4a                 : 152
    Manu Chao - Mr Bobby.m4a                : 229
    Manu Chao - Papito.m4a                  : 171
    Manu Chao - Promiscuity.m4a             : 96
    Manu Chao - Trapped by Love.m4a         : 114
    Total                                   : 0:45:32

What will you learn?

Why do we think this is cool? There are a couple of subtasks here:

  1. You learn how to do a common sysadmin task of listing files in a directory (check out the os, glob and pathlib modules).

  2. You learn how to convert and calculate mm:ss (minutes/seconds) timings, which will hone your datetime skills.

  3. Check out the Cheese Shop for packages that can read mp3 / mp4 meta data or use an external tool like FFmpeg which gives you the opportunity to play with subprocess:

    The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. - docs

Good luck and have fun!

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