RTSP 流打开，但无法在其上使用 VideoWriter

Question

我正在运行

rtsp-simple-server

，我正在尝试将相机馈送至 rtsp 流，但

VideoWriter

返回未打开。我做错了什么吗？

我创建了一个小样本，重现了问题。

import cv2

# camera index
camera_index = 0

# RTSP address
rtsp_address = "rtsp://localhost:8554/stream1"

# create a video capture object
cap = cv2.VideoCapture(camera_index)

# check if the capture object was successfully created
if not cap.isOpened():
    print("Failed to open camera")
    exit()

# create a video writer object
fourcc = cv2.VideoWriter_fourcc(*"H264")
try :
    out = cv2.VideoWriter(rtsp_address, fourcc, 20.0,(int(cap.get(3)),int(cap.get(4))))
except Exception as ex :
    print(ex)

# check if the video writer object was successfully created
if not out.isOpened():
    print("Failed to open RTSP stream")
    exit()

# loop through frames
while True:
    # capture a frame from the camera
    ret, frame = cap.read()

    # check if the frame was successfully captured
    if not ret:
        print("Failed to capture frame")
        break

    # write the frame to the video writer object
    out.write(frame)

    # display the frame (optional)
    cv2.imshow("frame", frame)

    # wait for key press to exit
    if cv2.waitKey(1) & 0xFF == ord("q"):
        break

# release resources
cap.release()
out.release()
cv2.destroyAllWindows()

Answer 1

对于 RTSP，我们需要使用以下编解码器格式，它对我有用 fourcc = cv2.VideoWriter_fourcc('M','J','P','G')

更新程序

import cv2
camera_index = 0
rtsp_address = "rtsp://localhost:8554/stream1"
cap = cv2.VideoCapture(camera_index)
if not cap.isOpened():
    print("Failed to open camera")
    exit()
fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
try :
    out = cv2.VideoWriter('v21.avi', fourcc, 20.0,        (int(cap.get(3)),int(cap.get(4))))
except Exception as ex :
    print(ex)

if not out.isOpened():
    print("Failed to open RTSP stream")
    exit()
while True:
    ret, frame = cap.read()
    if not ret:
        print("Failed to capture frame")
        break
    out.write(frame)
    cv2.imshow("frame", frame)
    if cv2.waitKey(1) & 0xFF == ord("q"):
        break

cap.release()
out.release()
cv2.destroyAllWindows()