连接直播地址，并设置每个几秒读取视频帧，并将图片保存
import cv2
from datetime import datetime,timedelta
video_full_path = "rtmp://192.168.18.23:1935/myapp/test1"
cap = cv2.VideoCapture(video_full_path)
print(cap.isOpened())
frame_count = 1
now = datetime.now()
print(now)
strnow = now.strftime('%Y-%m-%d %H:%M:%S')
period = timedelta(seconds=3)
next_time = now + period
strnext_time = next_time.strftime('%Y-%m-%d %H:%M:%S')
period1 = timedelta(seconds=10)
next_time1 = now + period1
strnext_time1 = next_time1.strftime('%Y-%m-%d %H:%M:%S')
while (datetime.now()-now < timedelta(seconds=10)):
ral, frame = cap.read()
iter_now = datetime.now()
iter_now_time = iter_now.strftime('%Y-%m-%d %H:%M:%S')
if str(iter_now_time) == str(strnext_time):
iter_time = iter_now + period
strnext_time = iter_time.strftime('%Y-%m-%d %H:%M:%S')
print(1111)
cv2.imwrite("static/" + "video" + "_%d.jpg" % frame_count, frame)
frame_count = frame_count + 1
continue
print(datetime.now())
