Concatenating VideoFileClip is too slow

In our django project we are receiving a text from the user and integrating the text to 6 different parts of the the video. Below is the code we are using. It is very slow, takes more than 1 minute to load the page. Is there any way to load it faster ?

def videoView(request):
    if request.method == "POST":
        brand=request.POST["brand"]
        video = VideoFileClip("video.mp4").subclip(0,3)
        
        txt_clip = ( TextClip(brand,fontsize=40,color='black', font="Helvetica-Bold")
                     .set_position((1325,670))
                     .set_duration(3) )
        result1 = CompositeVideoClip([video, txt_clip])

        video = VideoFileClip("video.mp4").subclip(3.01,6)        
        txt_clip = ( TextClip(brand,fontsize=40,color='black')
                     .set_position((450,450))
                     .set_duration(3) )
        result2 = CompositeVideoClip([video, txt_clip]) # Overlay text on video

        video = VideoFileClip("video.mp4").subclip(6.01,9)
        txt_clip = ( TextClip(brand,fontsize=40,color='black')
                     .set_position((1305,590))
                     .set_duration(3) )
        result3 = CompositeVideoClip([video, txt_clip]) # Overlay text on video

        video = VideoFileClip("video.mp4").subclip(9.01,12)
        txt_clip = ( TextClip(brand,fontsize=40,color='black')
                     .set_position((1235,520))
                     .set_duration(3) )
        result4 = CompositeVideoClip([video, txt_clip]) # Overlay text on video

        video = VideoFileClip("video.mp4").subclip(12.01,15)
        txt_clip = ( TextClip(brand,fontsize=40,color='black')
                     .set_position((470,500))
                     .set_duration(3) )

        result5 = CompositeVideoClip([video, txt_clip]) # Overlay text on video

        video = VideoFileClip("video.mp4").subclip(15.01,18.08)
        txt_clip = ( TextClip(brand,fontsize=40,color='black')
                     .set_position((1250,510))
                     .set_duration(3) )
        result6 = CompositeVideoClip([video, txt_clip]) # Overlay text on video

        result = concatenate([result1, result2, result3, result4, result5, result6]) # Overlay text on video
        result.resize(width=480).write_videofile("media/{}.webm".format(brand) ,
        fps=5,threads=4,logger=None, audio=False) # Many options...

    else:
        brand=None
        print("Sorry,Something went wrong.")
    return render(request, 'video/video_display.html',{'brand':brand})

[Beadsworth]

I am also experiencing prohibitively slow video-writing. See below for simple code example – 10 second clip with low-def resolution, 1FPS, ultrafast setting takes 40 seconds to render. This is on a computer with 4.0 GHz, 4 core CPU & 32GB RAM.

import moviepy.editor

input_path = r'some\input\path.mp4'
output_path = r'some\output\path.mp4'

clip1 = moviepy.editor.VideoFileClip(filename=input_path).subclip(t_start=0, t_end=10)

clip1.write_videofile(output_path, preset='ultrafast', fps=1, audio=False)

[keikoro]

Closing this issue as we haven’t heard back from OP since 2019 and the suggestions above sound like useful workarounds.