def build_movie(self):
""" Concatenate self._full_frames images into video file, add back original music. """
from moviepy.editor import AudioFileClip, ImageSequenceClip
outname = self.decomposer.wav_file.replace('input', 'output')
outname = outname.replace('wav', 'mp4')
output = ImageSequenceClip(
[self._generate_keyboard(t)[0] for t in range(self.decomposer.chromagram_raw.shape[1])], fps=self.fps_out/2
)
output = output.cutout(0, 1) # trim to compensate for FFT lag
output = output.set_audio(AudioFileClip(self.decomposer.wav_file))
output.write_videofile(
outname,
fps=self.fps_out,
temp_audiofile="temp-audio.m4a",
remove_temp=True,
codec="libx264",
audio_codec="aac"
)