This is a script to handle bulk audio and video to mp3 conversion.
It uses the Pydub python package.

Place the script in a directory together with the files you wish to convert to mp3.

.
└── [directory]
    ├── convert2mp3.py
    ├── file1
    ├── file2
    └── file3

Alternatively, if the files are in multiple directories, you can also covert them conserving their directory path.

.
├── convert2mp3.py
├── [subdirectory1]
│   ├── file1
│   ├── file2
│   └── file3
├── [subdirectory2]
│   ├── file1
│   ├── file2
│   └── file3
└── [subdirectory3]
    ├── file1
    ├── file2
    └── file3

Execute the script on terminal:

> python3 convert2mp3.py