Error when writing video file out

Expected Behavior

Using write_videofile("data/output.mp4", fps='30') should produce a video file at data/output.mp4

Actual Behavior

Moviepy throws an error TypeError: must be real number, not str from the file ffmpeg_writer.py and exits the program.

Steps to Reproduce the Problem

Below I have included the section of code that is responsible for actually generating and saving the video file to the disk

clipData = []
for path in clipPaths:
     newClip = VideoFileClip(path)
    normalClip = audio_normalize(VideoFileClip(path))
    clipData.append(newClip)
finalVideo = concatenate_videoclips(clipData, method='compose')
finalVideo.write_videofile("data/output.mp4", fps='30')

• clipPaths is a list of paths to the clips that I am using to make the video.

I have also included the full stack trace that I get when I run the code

Moviepy - Building video data/output.mp4.
MoviePy - Writing audio in outputTEMP_MPY_wvf_snd.mp3
MoviePy - Done.                                                                                                                                                                               
Moviepy - Writing video data/output.mp4

Traceback (most recent call last):
  File "src/videoEditor.py", line 60, in <module>
    globals()[sys.argv[1]]()
  File "src/videoEditor.py", line 51, in GenerateVideo
    finalVideo.write_videofile("data/output.mp4", fps='30')
  File "<decorator-gen-55>", line 2, in write_videofile
  File "/home/mwollam/.local/lib/python3.8/site-packages/moviepy/decorators.py", line 54, in requires_duration
    return f(clip, *a, **k)
  File "<decorator-gen-54>", line 2, in write_videofile
  File "/home/mwollam/.local/lib/python3.8/site-packages/moviepy/decorators.py", line 135, in use_clip_fps_by_default
    return f(clip, *new_a, **new_kw)
  File "<decorator-gen-53>", line 2, in write_videofile
  File "/home/mwollam/.local/lib/python3.8/site-packages/moviepy/decorators.py", line 22, in convert_masks_to_RGB
    return f(clip, *a, **k)
  File "/home/mwollam/.local/lib/python3.8/site-packages/moviepy/video/VideoClip.py", line 300, in write_videofile
    ffmpeg_write_video(self, filename, fps, codec,
  File "/home/mwollam/.local/lib/python3.8/site-packages/moviepy/video/io/ffmpeg_writer.py", line 213, in ffmpeg_write_video
    with FFMPEG_VideoWriter(filename, clip.size, fps, codec = codec,
  File "/home/mwollam/.local/lib/python3.8/site-packages/moviepy/video/io/ffmpeg_writer.py", line 88, in __init__
    '-r', '%.02f' % fps,
TypeError: must be real number, not str

Specifications

• Python Version: Python 3.8.2
• Moviepy Version: moviepy 1.0.3
• Platform Name: Ubuntu 20.04.1 LTS

[smidm]

This happens when moviepy and decorator modules are not compatible (e.g. after the decorator module was upgraded to the last version).

This should solve the issue:

pip uninstall moviepy decorator
pip install moviepy

[SattyAG]

Hi, In my code, I am facing the error TypeError: must be real number, not NoneType and it’s after the first two lines in output section:

Moviepy - Building video data/output.mp4.
MoviePy - Writing audio in outputTEMP_MPY_wvf_snd.mp3

I have set fps as fps=clip.fps where clip contains the original video file.

It worked after upgrading moviepy.

Thank you.