from moviepy.editor import VideoFileClip, concatenate_videoclips

video1 = VideoFileClip("video1.mp4").set_fps(24) # resample to 24 fps

video2 = VideoFileClip("video2.mp4").set_fps(24) # resample to 24 fps

final_video = concatenate_videoclips([video1, video2])

final_video.write_videofile("output.mp4", fps=24)