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1.共享内存（python共享内存实际案例，传输opencv frame）

article 2025/9/18 10:37:31

主进程程序

send.py

import cv2
import numpy as np
from multiprocessing import shared_memory, resource_trackercap = cv2.VideoCapture(0)
if not cap.isOpened():print("无法打开 RTSP 流，请检查地址、网络连接或 GStreamer 配置。")
else:# 创建共享内存shm_name = 'shared_frame'frame_shape = (360, 640, 3)  # 假设视频帧的大小为 480x640shm = shared_memory.SharedMemory(create=True, size=np.prod(frame_shape) * np.dtype(np.uint8).itemsize, name=shm_name)frame_buffer = np.ndarray(frame_shape, dtype=np.uint8, buffer=shm.buf)try:while True:ret, frame = cap.read()if ret:# 将frame写入共享内存frame = cv2.resize(frame, (640, 360))np.copyto(frame_buffer, frame)cv2.namedWindow("RTSP Stream", cv2.WINDOW_NORMAL)cv2.imshow("RTSP Stream", frame)if cv2.waitKey(1) & 0xFF == ord('q'):breakelse:print("无法读取视频帧")breakfinally:cap.release()cv2.destroyAllWindows()shm.close()shm.unlink()

receive.py

import cv2
import numpy as np
from multiprocessing import shared_memory, resource_tracker# 共享内存的名称
shm_name = 'shared_frame'
frame_shape = (360, 640, 3)  # 假设视频帧的大小为 480x640# 连接到共享内存
shm = shared_memory.SharedMemory(name=shm_name)
# 注销资源跟踪器,避免receive异常终止，关闭共享内存
resource_tracker.unregister(shm._name, 'shared_memory')
frame_buffer = np.ndarray(frame_shape, dtype=np.uint8, buffer=shm.buf)try:while True:# 从共享内存中读取frameframe = np.copy(frame_buffer)cv2.namedWindow("Shared Memory Frame", cv2.WINDOW_NORMAL)cv2.imshow("Shared Memory Frame", frame)if cv2.waitKey(1) & 0xFF == ord('q'):break
finally:cv2.destroyAllWindows()shm.close()

终端1启动

send.py

终端2启动 receive.py