Save a batch of frames as video using opencv-python

I need to buffer some frames from a VideoCapture and then save the latest n frames

This works:

from cv2 import cv2

cap = cv2.VideoCapture(0)

width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
fps = int(cap.get(cv2.CAP_PROP_FPS))

buffered_frames = []

frame = 0

frames_to_record = 180

while True:
    success, img = cap.read()

    if not success:
        break

    cv2.imshow("Stream", img)
    if cv2.waitKey(fps) == ord('q'):
        break

    frame += 1
    buffered_frames.append(img)

    
    if frame % 500 == 0:
        result = cv2.VideoWriter("./buffer.mp4", cv2.VideoWriter_fourcc(*'mp4v'), fps, (width, height))

        for f in buffered_frames[ frame-frames_to_record: ]:
            result.write(f)

        result.release()
        buffered_frames = []
        frame = 0

cap.release()

However, I'm looking for some way to optimize this, saving the frames as a batch, so, instead of:

for f in buffered_frames[ frame-frames_to_record: ]:
    result.write(f)

I'm looking for a way to save all the list at once, something like:

result.write(buffered_frames[ frame-frames_to_record: ])

But, the example above doesn't work, is there a way to save a batch of frames at once using OpenCV? (So it have some low-level optimization under the hood)