Convert an audio album to video for Youtube

album_to_mp4.py

#!/usr/bin/env python3

import shutil
import subprocess
import os
import sys
import sys
from pathlib import Path

INPUT_AUDIO_DIR = './audio'
OUPUT_VIDEO_DIR = './video'
audio_files = os.listdir(INPUT_AUDIO_DIR)
image_file = './cover.png'

if shutil.which('ffmpeg') is None:
  print('Unable to find ffmpeg.')
  sys.exit(1)

def process_file(audio_file: str) -> str:
  abs_image_file = os.path.abspath(INPUT_AUDIO_DIR + '/' + audio_file)
  abs_audio_file = os.path.abspath(image_file)
  video_file = os.path.splitext(audio_file)[0] + '.mp4'
  abs_output_file = os.path.abspath(OUPUT_VIDEO_DIR + '/' + video_file)

  # Create directory if necessary.
  os.makedirs(os.path.dirname(abs_output_file), exist_ok=True)

  # Process with ffmpeg.
  ffmpeg_args = [
    'ffmpeg',
    '-y',                   # Overwrite existing file.
    '-r', '1',              # Framerate of 1 fps.
    '-loop', '1',           # Loop on the image for video.
    '-i', abs_audio_file,   # Input audio.
    '-i', abs_image_file,   # Input image.
    '-c:a', 'libmp3lame',   # Audio codec
    '-b:a', '320k',         # Audio bitrate.
    '-s', '1080x1080',      # Size of the video output.
    '-c:v', 'libx264',      # Video codec.
    '-preset', 'fast',      # Make smallest video possible. #veryslow
    '-crf', '0',            # Constate rate factor (0 means lossless).
    '-shortest',            # Use audio duration.
    abs_output_file
  ]
  returncode = subprocess.call(ffmpeg_args)

  # Exit if any error.
  if returncode != 0:
    sys.exit(returncode)
  
  return abs_output_file

for audio_file in audio_files:
  print(f'Processing: \'{audio_file}\'…')
  output_file = process_file(audio_file)
  print(f'Created {output_file}')

print('Done.')