How to use the ffpyplayer.pic.SWScale function in ffpyplayer

image = image.convert('RGB')
                output = BytesIO()
                image.save(output, 'jpeg')
                thumbnail = output.getvalue()

            elif extension in movietypes:
                #This is a video file, use ffpyplayer to generate a thumbnail
                player = MediaPlayer(full_filename, ff_opts={'paused': True, 'ss': 1.0, 'an': True})
                frame = None
                while not frame:
                    frame, value = player.get_frame(force_refresh=True)
                player.close_player()
                player = None
                frame = frame[0]
                frame_size = frame.get_size()
                frame_converter = SWScale(frame_size[0], frame_size[1], frame.get_pixel_format(), ofmt='rgb24')
                new_frame = frame_converter.scale(frame)
                image_data = bytes(new_frame.to_bytearray()[0])

                image = Image.frombuffer(mode='RGB', size=(frame_size[0], frame_size[1]), data=image_data, decoder_name='raw')
                image = image.transpose(1)

                image.thumbnail((self.thumbsize, self.thumbsize), Image.ANTIALIAS)
                output = BytesIO()
                image.save(output, 'jpeg')
                thumbnail = output.getvalue()
            return thumbnail
        except:
            return None

self.filename = filename
        images = []

        while True:
            frame, t = loader.next_frame()
            if frame is None:
                break
            images.append(frame)
        if not len(images):
            raise Exception('No image found in {}'.format(filename))

        w, h = images[0].get_size()
        ifmt = images[0].get_pixel_format()
        if ifmt != 'rgba' and ifmt != 'rgb24':
            fmt = 'rgba'
            sws = SWScale(w, h, ifmt, ofmt=fmt)
            for i, image in enumerate(images):
                images[i] = sws.scale(image)
        else:
            fmt = ifmt if ifmt == 'rgba' else 'rgb'

        return [ImageData(w, h, fmt, img.to_memoryview()[0], source_image=img)
                for img in images]

self.filename = filename
        images = []

        while True:
            frame, t = loader.next_frame()
            if frame is None:
                break
            images.append(frame)
        if not len(images):
            raise Exception('No image found in {}'.format(filename))

        w, h = images[0].get_size()
        ifmt = images[0].get_pixel_format()
        if ifmt != 'rgba' and ifmt != 'rgb24':
            fmt = 'rgba'
            sws = SWScale(w, h, ifmt, ofmt=fmt)
            for i, image in enumerate(images):
                images[i] = sws.scale(image)
        else:
            fmt = ifmt if ifmt == 'rgba' else 'rgb'

        return [ImageData(w, h, fmt, img.to_memoryview()[0], source_image=img)
                for img in images]

self.first_frame = None
        else:
            self.player.set_pause(False)
            frame = None
            while not frame:
                frame, value = self.player.get_frame(force_refresh=False)
                if value == 'eof':
                    return None
            self.player.set_pause(True)
        self.frame_number = self.frame_number + 1
        if self.max_frames:
            if self.frame_number > self.max_frames:
                return None
        frame_image = frame[0]
        frame_size = frame_image.get_size()
        frame_converter = SWScale(frame_size[0], frame_size[1], frame_image.get_pixel_format(), ofmt='rgb24')
        new_frame = frame_converter.scale(frame_image)
        image_data = bytes(new_frame.to_bytearray()[0])
        image = Image.frombuffer(mode='RGB', size=(frame_size[0], frame_size[1]), data=image_data, decoder_name='raw')
        #for some reason, video frames are read upside-down? fix it here...
        image = image.transpose(PIL.Image.FLIP_TOP_BOTTOM)
        if image.mode != 'RGB':
            image = image.convert('RGB')
        image = self.adjust_image(image, preview=False)
        return [image, frame[1]]

def reload_edit_image(self, *_):
        """Regenerate the edit preview image."""
        if self.video:
            if not self.player:
                return
            location = self.length * self.position
            frame = self.seek_player(location)
            frame = frame[0]
            frame_size = frame.get_size()
            pixel_format = frame.get_pixel_format()
            frame_converter = SWScale(frame_size[0], frame_size[1], pixel_format, ofmt='rgb24')
            new_frame = frame_converter.scale(frame)
            image_data = bytes(new_frame.to_bytearray()[0])

            original_image = Image.frombuffer(mode='RGB', size=(frame_size[0], frame_size[1]), data=image_data, decoder_name='raw')
            #for some reason, video frames are read upside-down? fix it here...
            original_image = original_image.transpose(PIL.Image.FLIP_TOP_BOTTOM)
            self.original_width = original_image.size[0]
            self.original_height = original_image.size[1]
            self.original_image = original_image
            image = original_image.copy()

        else:
            original_image = Image.open(self.source)
            try:
                self.exif = original_image.info.get('exif', b'')
            except: