How to scale up video with Python moviepy?

Question

I am using Python 3.10 and moviepy library to process videos. I need to scale up (zoom) video without changing its resolution . There are a lot of example of using moviepy resize method , but it changes only the resolution .

Are there any options of scaling video with moviepy or maybe you can suggest some solutions with openCV?

Answer 1

For achieving zoomed in video, we may combine scaling and cropping .

Example:

from moviepy.editor import VideoFileClip

clip = VideoFileClip("input.mp4")
width, height = clip.size
resized_and_cropped_clip = clip.resize(2).crop(x1=width//2, y1=height//2, x2=width*3//2, y2=height*3//2)
resized_and_cropped_clip.write_videofile("output.mp4")

• resize(2) - resize the video by a factor of 2 in each axis.
• crop(x1=width//2, y1=height//2, x2=width*3//2, y2=height*3//2) - crop a rectangle with the original image size around the center of the resized video.

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Alternately we may first crop and then resize.
It is more efficient, but may result minor degradation at the frame's margins:

from moviepy.editor import VideoFileClip

clip = VideoFileClip("input.mp4")
width, height = clip.size
resized_and_cropped_clip = clip.crop(x1=width//4, y1=height//4, x2=width*3//4, y2=height*3//4).resize(2)
resized_and_cropped_clip.write_videofile("output.mp4")

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The above examples show zoom in by a factor of x2.
For zooming by other factor, we have to adjust the computation of x1 , y1 , x2 , y2 arguments.