How to combine audio and video in Pytube?

I am trying to write a code to download YouTube videos using Pytube on Python 3.6. But for most videos progressive download(Audio and Video in same file) format is available only upto 360p. So I want to download audio and video files separately and combine it. I am able to to download the audio and video files. How can I combine the two file together?

Basically I don't find any method to marge Audio and Video in Pytube but you can use ffmpeg for muxing.

First of all you have to install ffmpeg

1. ffmpeg installation guide for Windows

2. for Ubuntu just sudo apt install ffmpeg

Add a dependency ffmpeg-python a python wrapper of ffmpeg

3. pip install ffmpeg-python

Now we are ready to go with this code snippet

import ffmpeg

video_stream = ffmpeg.input('Of Monsters and Men - Wild Roses.mp4')
audio_stream = ffmpeg.input('Of Monsters and Men - Wild Roses_audio.mp4')
ffmpeg.output(audio_stream, video_stream, 'out.mp4').run()

for more, ffmpeg-python API References