ValueError in write_videofile after concatenate_videoclips

[FedeSpu]

Expected Behavior

Export the video correctly after using concatenate_videoclips and write_videofile

Actual Behavior

ValueError, and the video is not produced

Steps to Reproduce the Problem

from moviepy import *
title_clip = TextClip(text=title_frame_txt, font="Arial", font_size=34, color='white', bg_color='black', size=(width, height), duration=1.5, text_align='center')
video = CompositeVideoClip(clip_list, use_bgclip=True)

final_video = concatenate_videoclips([title_clip, video], method='chain')
final_video.write_videofile(output_file, fps=out_fps, codec='libx264')

Solution

The error is in "ffmpeg_writer.py" file in line frame = np.dstack([frame, mask]). The problem is that the mask has shape [1,1]. This is due to concatenate_videoclips, that in line mask = clip.mask or ColorClip([1, 1], color=1, is_mask=True) produces mask of shape [1,1].
The solution that I've found is to replace this line with mask = clip.mask or ColorClip(clip.size, color=1, is_mask=True)

Specifications

• Python Version: 3.12.2
• MoviePy Version: 2.0.0
• Platform Name: Ubuntu
• Platform Version: 22.04

[Implosiv3]

I faced the same error and this solves it. Apparently, there is no reason to be [1, 1] shape in that situacion as it is fulfilling masks for clips without them when compositing. As FedeSpu says 👇

File: moviepy\video\compositing\CompositeVideoClip.py
Line 292, replace with this: mask = clip.mask or ColorClip(clip.size, color=1, is_mask=True)

[OsaAjani]

Fixed with #2307