Merges multiple .mp4 video files into a single file

merge_mp4.py

# Merges multiple .mp4 video files into a single file. 
# Add your .mp4 files into a video/ subdirectory and run this script.
# Will generate a final_video.mp4 file in the same directory as this file

import os
from moviepy.editor import VideoFileClip, concatenate_videoclips

# ### SETTINGS - Modify this to your preferences ###
video_fade_secs = 1  # Video fade in and out duration in seconds.
audio_fade_secs = 1  # Audio fade in and out duration in seconds.
video_directory = "video"  # Directory with video files. Drop your .mp4 files into this directory

# ### MAIN ###
# get .mp4 files from directory
video_files = [
    video_directory + "/" + file
    for file in os.listdir(video_directory)
    if file.endswith(".mp4")
]

# create list of clips
videos = []
for video in video_files:
    videos.append(VideoFileClip(video))

# apply fade effects
videos = [
    video.fadein(video_fade_secs)
    .fadeout(video_fade_secs)
    .audio_fadein(audio_fade_secs)
    .audio_fadeout(audio_fade_secs)
    for video in videos
]

# merge clips
videoclips = concatenate_videoclips(videos, method="compose")

# write to final .mp4
videoclips.write_videofile("final_video.mp4")