使用gstreamer与python opencv捕获实时流? [英] using gstreamer with python opencv to capture live stream?

问题描述

首先，我拥有带有Gstreamer库的python 3.

First of all i have python 3 with the library Gstreamer in it.

print(cv2.getBuildInformation())

它显示Gstreamer，旁边是"YES".

it shows Gstreamer with YES next to it.

这是在rasperryPi 3中使用gstreamer的发送器代码.

Here is the transmitter code using gstreamer in rasperryPi 3:

gst-launch-1.0 v4l2src device="/dev/video0" ! video/x-raw,width=320,height=240 ! videoconvert ! x264enc tune=zerolatency ! rtph264pay ! udpsink host='my ip address' port=10000

并且我将使用python代码确定形状，识别对象等.

and i will be using a python code to determine shapes , recognize objects .. etc

这是我的python代码:

here is my python code:

import numpy as np
import cv2




def receive():
cap = cv2.VideoCapture("udpsrc port=10000 ! application/x-rtp,encoding-name=H264 ! rtpjitterbuffer ! rtph264depay ! avdec_h264 ! videoconvert ! ximagesin ", cv2.CAP_GSTREAMER)

while True:

    ret,frame = cap.read()

    if not ret:
        print('empty frame')
        continue 


    cv2.imshow('receive', frame)
    if cv2.waitKey(1)&0xFF == ord('q'):
        break


cap.release()



receive();

但它始终显示空白帧.

当我在终端上尝试此命令时:

when i tried this command on terminal:

gst-launch-1.0 udpsrc port=10000 ! application/x-rtp,encoding-name=H264 ! rtpjitterbuffer ! rtph264depay ! avdec_h264 ! videoconvert ! ximagesink

它工作正常，所以问题出在我的python端.

it works just fine, so the problem is on my python end.

那你有什么建议?

推荐答案

cap = cv2.VideoCapture('udpsrc port=7000 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96" ! rtph264depay ! decodebin ! videoconvert ! appsink', cv2.CAP_GSTREAMER)

使用此管道，它将正常工作.将端口更改为您正在使用的端口.

use this pipeline, it will work just fine. change the port to the one you are using.

这篇关于使用gstreamer与python opencv捕获实时流?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！