concatenate_video.py

from moviepy.editor import concatenate_videoclips, VideoFileClip


def concatenate(video_clip_paths, output_path, method="compose"):
    """Concatenates several video files into one video file
    and save it to `output_path`. Note that extension (mp4, etc.) must be added to `output_path`
    `method` can be either 'compose' or 'reduce':
        `reduce`: Reduce the quality of the video to the lowest quality on the list of `video_clip_paths`.
        `compose`: type help(concatenate_videoclips) for the info"""
    # create VideoFileClip object for each video file
    clips = [VideoFileClip(c) for c in video_clip_paths]
    if method == "reduce":
        # calculate minimum width & height across all clips
        min_height = min([c.h for c in clips])
        min_width = min([c.w for c in clips])
        # resize the videos to the minimum
        clips = [c.resize(newsize=(min_width, min_height)) for c in clips]
        # concatenate the final video
        final_clip = concatenate_videoclips(clips)
    elif method == "compose":
        # concatenate the final video with the compose method provided by moviepy
        final_clip = concatenate_videoclips(clips, method="compose")
    # write the output video file
    final_clip.write_videofile(output_path)


if __name__ == "__main__":
    import argparse
    parser = argparse.ArgumentParser(
        description="Simple Video Concatenation script in Python with MoviePy Library")
    parser.add_argument("-c", "--clips", nargs="+",
                        help="List of audio or video clip paths")
    parser.add_argument("-r", "--reduce", action="store_true", 
                        help="Whether to use the `reduce` method to reduce to the lowest quality on the resulting clip")
    parser.add_argument("-o", "--output", help="Output file name")
    args = parser.parse_args()
    clips = args.clips
    output_path = args.output
    reduce = args.reduce
    method = "reduce" if reduce else "compose"
    concatenate(clips, output_path, method)