piano-vis 0.2.0

A Python piano video exporter.

PianoVis 0.2.0

A Python piano video exporter.

Examples:

• Papillon (Grieg)
• Impromptu Rosamunde (Schubert)
• Sonatina (Clementi)

Quick Start

1. Install PianoVis: pip install piano-vis
2. Follow this code format:

import pianovis

resolution = (1920, 1080)
fps = 30
offset = 1

vid = pianovis.Video(resolution, fps, offset)
vid.add_midi("midi1.mid")
vid.add_midi("midi2.mid")
vid.set_audio("audio.mp3")
vid.export("video.mp4")

pianovis.Video

pianovis.Video is the main video class which stores all midi and audio files, and exports the final video.

• Video.__init__(resolution: Tuple[int, int], fps: int, offset: int) -> None
  • Initializes video.
  • resolution: (x, y) pixel resolution of video.
  • fps: FPS (frames per second) of video.
  • offset: Offset (frames) of video from audio. Usually, a value of 1 makes the video look lined up with the audio.
  • decor_surf=None Decoration surface, blitted under the piano.
• Video.configure(path: str, value: Any) -> None
  • Sets an option for the video (read more in the Customization section).
  • path: Option path.
  • value: Value to set path to.
• Video.add_midi(path: str) -> None
  • Appends path to midi list.
  • path: Midi file path.
• Video.set_audio(path: str) -> None
  • Sets audio file to path.
  • path: Audio file path.
• Video.preview(resolution: Tuple[int, int] = (1600, 900), show_meta: bool = True) -> None:
  • Opens a pygame window to preview the animation.
  • resolution=(1600, 900): Resolution of pygame window.
  • show_meta=True: Show metadata in the corner of window.
  • audio=True: Play audio along preview.
• Video.export(self, path: str, multicore: bool = False, max_cores: int = multiprocessing.cpu_count(), notify: bool = False) -> None:
  • Exports video to path.
  • path: Path to export (mp4)
  • multicore=False: Use multiple cores to export. Can be faster, but will take more power.
  • max_cores=multiprocessing.cpu_count(): Maximum cores to use. Only relevant if using multicore.
  • notify=False: Sends notification when done exporting. Only works on linux.

Customization

Run Video.configure to change options.

• keys.white.gap: Gap (pixels) between white keys.
• keys.white.color: Color (RGB) of white keys.
• keys.black.width_fac: Factor of white key width.
• keys.black.height_fac: Factor of white key height.
• keys.black.color: Color (RGB) of black keys.
• blocks.speed: Speed (pixels per second) of blocks.
• blocks.border: Border width (pixels) of blocks.
• blocks.color_grad: Color gradient of blocks: ((fac1, hsv1), (fac2, hsv2)...)
• blocks.color_hue: Hue adjustment (additive) to color.
• blocks.color_saturation: Saturation adjustment (multiplicative) to color.
• blocks.color_value: Value adjustment (multiplicative) to color.
• blocks.color_border: Color (RGB) of border.
• blocks.rounding: Rounding radius of blocks.
• blocks.motion_blur: Use motion blur in blocks.
• blocks.light: Light up blocks when hit. Still in development.

How It Works

• The user adds midis and sets an audio.
• When the user calls Video.export, a few things happen:
  • All midis are parsed.
  • Single core:
    • Each frame is rendered with pygame, saved, and encoded with opencv.
    • All temporary files are deleted.
  • Multi core:
    • Each core is assigned a chunk of frames and renders and saves them.
    • Each frame is encoded with opencv.
    • All temporary files are deleted.
  • The audio is combined with video with ffmpeg.

Extras

Constants (pianovis.constants)

Note: pianovis.BLACK == pianovis.constants.BLACK

• Colors (Normalized HSV)
• Block color gradient presets.