Freeze effect removes with_start and with_end from clip

[Pierrad]

Hi, thanks for this great library!

Problem

When working on a video, we just run into the following bug (we think it's a bug).

When you use the Freeze effect on a VideoClip, you need to put the with_start() after the with_effects()otherwise it will remove the previous clip (if exists) from the final video. It seems that the Freeze effect redefine the start and end of a VideoClip.

Non-working code :

from moviepy import *

clip = VideoFileClip("clip.mp4")
clip = clip.with_start(other_clip.end)
clip = clip.with_effects([vfx.Freeze(12, 2)]) # Effect after with_start()

Working code :

from moviepy import *

clip = VideoFileClip("clip.mp4")
clip = clip.with_effects([vfx.Freeze(12, 2)]) # Effect before with_start()
clip = clip.with_start(other_clip.end)

Expected behavior

We think that whenever the position of the effect, it should not erase the start and end of the video. Or otherwise, it should be specified somewhere in the documentation.

Specifications

• Python Version: 3.10
• MoviePy Version: 2.1.1
• Platform Name: MacOS
• Platform Version: 14.5

[Implosiv3]

Yes, thats a good point. I've been watching the code and that is because that effect is creating a new clip instead of just transforming the original one (as most of the effects do), so the new clip doesn't have those start and end properties.

As the Freeze effect will always increase the duration, I think setting the start and end of that new clip would not be a problem, so it would work as the others (preserving start and end), but lets listen one of the main project maintainers.