動画と音声をマージ

merge.py

#pip install ffmpeg-python
import ffmpeg


in_file = ffmpeg.input('output.avi')
in_wave = ffmpeg.input('1554859795.wav')


(
    ffmpeg
    .concat(
        in_file,
        in_wave,
        v = 1,
        a = 1
    )
    .output('out.mp4')
    .run()
)