Concatenation with TextClip and VideoFileClip results in unplayable video, MoviePy 1.0.3

Expected Behavior

Concatenating a TextClip with a VideoFileClip should put the two clips together and be playable.

Actual Behavior

Concatenating a TextClip with a VideoFileClip renders an unplayable video. When opened in the Movies & TV Windows app, it simply cannot be played. When opened with Windows Media Player it also cannot be played and causes the app to become unresponsive.

Steps to Reproduce the Problem

• Initialize virtual environment and install moviepy=1.0.3
• Download Windows ImageMagick-7.0.10-Q16-HDRI
• Set binary locations for ffmpeg and ImageMagick in config_defaults.py
• Run the following code

from moviepy.editor import *

first_five_seconds = VideoFileClip('./videos/2019-10-18.mp4').subclip(0, 5)
first_five_seconds.write_videofile('./clips/first_five_seconds.mp4')

title = TextClip('Title', fontsize=75, color='green')
title = title.set_position('bottom').set_duration(4)

with_title_screen = CompositeVideoClip([title, first_five_seconds])
with_title_screen.write_videofile('./clips/with_title_screen.mp4')

• The first is playable while the second is unplayable

Specifications

• Python Version: 3.8.3
• Moviepy Version: 1.0.3
• ImageMagick Binary Version: ImageMagick-7.0.10-Q16-HDRI
• Platform Name: Windows
• Platform Version: Windows 10

[riyanWi]

have same problem with TextClip and VideoFileClip with same specifications, but in my case there’s glitch in the end of the video.

[jcbrockschmidt]

Interestingly, removing with_position and font_size creates a working 36x12 video (using Moviepy version 2.0.0.dev2 at f5944d4):

from moviepy.editor import *

sub_clip = VideoFileClip("./media/big_buck_bunny_0_30.webm").subclip(0, 5)
title = TextClip("Title", color="green").with_duration(sub_clip.duration)
comp_clip = CompositeVideoClip([title, sub_clip])
comp_clip.write_videofile("./clips/with_title_screen.mp4")

What I think is happening is the section of sub_clip that overlaps with title is being shown. I experimented a bit with TextClips and found that setting the position to "bottom" often places them off screen (you usually want to use the align property for this sort of thing anyway). So perhaps in the original script the lack of overlap between first_five_seconds and title causes the compositing to break. Although, it should be noted that changing the order of title and first_five_seconds in CompositeVideoClip([...]) creates a functional video, so its more than just a lack of overlapping (if that’s even the cause).