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是否可以将变量内容复制到给定位置（ stream.copy_to('motion.h264') ），而不是将其保存在变量中以进行进一步处理。我想这样做的原因是，一旦收集了视频缓冲区，就能够降低视频分辨率。

提前致谢！

import io
import random
import picamera

def motion_detected():
    # Randomly return True (like a fake motion detection routine)
    return random.randint(0, 10) == 0

camera = picamera.PiCamera()
stream = picamera.PiCameraCircularIO(camera, seconds=20)
camera.start_recording(stream, format='h264')
try:
    while True:
        camera.wait_recording(1)
        if motion_detected():
            # Keep recording for 10 seconds and only then write the
            # stream to disk
            camera.wait_recording(10)
            stream.copy_to('motion.h264')
finally:
    camera.stop_recording()
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