Unroll

Unroll is a Python module to ease transcription of piano rolls to sheet music. It transcribes either a MIDI file or a video of a piano roll. It finds the notes, the tempo, roughly separates the hands, and writes the result in a Lilypond file. In particular

You can use it like this: ::

# TO TRANSCRIBE FROM A VIDEO

from unroll import video2scan, rollscan2keystrikes
focus = lambda im : im[[156],58:478]
scan = video2scan(videofile = "limehouse_nights.mp4", focus = focus)
keystrikes = rollscan2keystrikes(scan)
keystrikes = ks.transposed(26)
keystrikes.transcribe('score.ly', quarter_durations = [2,10,0.02])

# TO TRANSCRIBE FROM A MIDI FILE

from unroll import midi2keystrikes
keystrikes = midi2keystrikes('tiger_rag.mid')
ks.transcribe('score.ly', quarter_durations = [50,100,0.02])

Then you must edit score.ly to correct the mistakes and when you are done you compile it with ::

lilypond score.ly

Installation

Unroll can be installed by unzipping the source code in one directory and using this command: ::

(sudo) python setup.py install

You can also install it directly from the Python Package Index (PYPI_) with this command: ::

(sudo) pip install unroll

Contribute

Unroll is an open-source software originally written by Zulko_ and released under the MIT licence. The project is hosted on Github_ and everyone is welcome to contribute ! Please give feedback if you are using it and encounter difficulties.

.. _PYPI: https://pypi.python.org/pypi/unroll .. _Github: https://github.com/Zulko/Unroll .. _Zulko : https://github.com/Zulko