GIF smooth resize

PetPython

I have a problem resizing a .gif file. Qt documentation points out directly that QSize.scaled() method has Qt.KeepAspectRatio argument that should resize the .gif file smoothly preserving the original proportions:

But it doesn't work in my case. It just resizes to the exact pixels I set and ignores the third argument (the original gif's width is larger than height):

Static image has no problem with it since there's Qt.SmoothTransformation argument in QPixmap.scaled() method which works fine. For static images.

So how can I keep the original propotions of the gif when resizing it?
Below is my example code:

import sys
from   PyQt5.QtWidgets import *
from   PyQt5.QtGui     import *
from   PyQt5.QtCore    import *

GIF = 'GIF.gif'        # Insert your gif path here

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(500, 500)
        label = QLabel()
	
        vbox = QVBoxLayout()
        vbox.addWidget(label)
        vbox.setAlignment(Qt.AlignCenter)
        self.setLayout(vbox)

        gif = QMovie(GIF)
        gif.setScaledSize(QSize().scaled(300, 300, Qt.KeepAspectRatio))
        label.setMovie(gif)
        gif.start()

app = QApplication(sys.argv)
screen = Window()
screen.show()
sys.exit(app.exec_())

PetPython

So I just remembered about this post and since there's still no answer, I'll post my own workaround.

from PIL import Image

def smooth_gif_resize(gif, frameWidth, frameHeight):
    gif = Image.open(gif)
    gifWidth0, gifHeight0 = gif.size

    widthRatio = frameWidth / gifWidth0
    heightRatio = frameHeight / gifHeight0

    if widthRatio >= heightRatio:
        gifWidth1 = gifWidth0 * heightRatio
        gifHeight1 = frameHeight
        return gifWidth1, gifHeight1

    gifWidth1 = frameWidth
    gifHeight1 = gifHeight0 * widthRatio
    return gifWidth1, gifHeight1

And then your doing something like this:

gif = QMovie(GIF)
gifSize = QSize(*smooth_gif_resize(gif, 300, 300))
gif.setScaledSize(gifSize)
label.setMovie(gif)
gif.start()

You are welcome!