如何使用Python在线程中运行多个相机

Question

下面是我使用多线程池并行播放多个视频的代码。但每个输入仅播放一个视频。我希望每个视频单独打开。未合并

import concurrent.futures

RTSP_URL = "rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4"
RTSP_List = [RTSP_URL, RTSP_URL, RTSP_URL, RTSP_URL]


def url_to_video(url):
    video = cv2.VideoCapture(url)
    while True:
        _, frame = video.read()
        cv2.imshow("RTSP", frame)
        k = cv2.waitKey(1)
        if k == ord('q'):
            break
    video.release()
    cv2.destroyAllWindows()


while True:
    with concurrent.futures.ThreadPoolExecutor() as executor:
        executor.map(url_to_video, RTSP_List)```

how to play each video separately.

Answer 1

您只需要每个线程为 中的窗口使用不同的名称cv2.imshow，以便每个线程都会生成不同的窗口，并且您应该将它们放置在不同的地方，这样它们就不会出现在另一个之上，我只是添加到index它们中这样每个不同的窗口index都会在屏幕上有一个位置和不同的标题，而且当一个窗口完成后，你也不应该销毁所有窗口......

import concurrent.futures
import cv2
RTSP_URL = "rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4"
RTSP_List = [(RTSP_URL,0), (RTSP_URL,1), (RTSP_URL,2), (RTSP_URL,3)]


def url_to_video(tup):
    url,index = tup
    video = cv2.VideoCapture(url)
    while True:
        _, frame = video.read()
        cv2.imshow(f"RTSP {index}", frame)
        cv2.moveWindow(f"RTSP {index}", index*300, 0)
        k = cv2.waitKey(1)
        if k == ord('q'):
            break
    video.release()


while True:
    with concurrent.futures.ThreadPoolExecutor() as executor:
        executor.map(url_to_video, RTSP_List)
    cv2.destroyAllWindows()