Opencv VideoCapture File, Web Camera, RTSP stream

Vl
16 Nov, 2015
24
Opencv tutorial simple code in C++ to capture video from File, Ip camera stream and also the web camera plug into the computer. The key is to have installed the FFMPEG especially in case of reading the stream of IP cameras. In Windows just use Opencv Installation by Nugets packages Here. Simple easy under 2 minutes of installation. In Linux, you need to follow the instruction below. If you are on Debian Like package system. Under Fedora Red hat dist just use a different approach. Code is simple and installation is the key.. 

Windows use nugets packages
Linux you have to install and build Opencv With FFMPEG. Also simple. 

It is easy to capture video in OpenCV

Video capture
 in OpenCV is a really easy task, but for a little bit experienced user. 

What is the problem?
The problem is the installation of Opencv without recommended dependencies.

Just install all basic libs that are recommended on the website.
# Basic packages
sudo apt-get -y install build-essential
sudo apt-get -y install cmake
sudo apt-get -y install pkg-config


# Basic dependencies
sudo apt-get -y install libgtk2.0-dev python-dev python-numpy


# OpenCV dependencies part II.
sudo apt-get -y install libgstreamer0.10-0-dbg libgstreamer0.10-0 libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev libunicap2 libunicap2-dev libdc1394-22-dev libdc1394-22 libdc1394-utils libv4l-0 libv4l-dev
sudo apt-get -y install libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get -y install libdc1394-22-dev libdc1394-utils

sudo apt-get -y install libjpeg-dev libpng-dev libtiff-dev libjasper-dev
sudo apt-get -y install libtiff5 libtiff5-dev
sudo apt-get -y install libopenexr-dev
sudo apt-get -y install libjasper-dev
# Algebra
sudo apt-get -y install libeigen3-dev
Install ffmpeg for Opencv.
You need to download and build my own in the case of Debian Jessie or some version of Ubuntu.
Just download, and extract tar archive ffmpeg.tar.bz2.

1 configure instalation ./configure -- with Right Params.
2 Make - make -j4
3 install - make install
4 write config ldconfig -v

Compile opencv

Check this table during the OpenCV installation. if you have FFMPEG and all AV libs 
AVCODEC AVFORMAT AVUTIL AVSWSCALE you can continue with OpenCV installation.
opencv config ffmpef
Opencv config

Read video file in Opencv

VideoCapture capture("input.mp4");

Read rtsp stream in Opencv

VideoCapture capture("rtsp://USER:PASS@xxx.xxx.xxx.xxx/axis-media/media.amp?camera=2");
Some of my next post will be about rtsp stream format. PLS subscribe.

Read web camera in Opencv

VideoCapture capture(0);

Opencv 3 and higher c++ code

#include <vector>
#include <fstream>
#include <iostream>
#include <math.h>
#include <Windows.h>

#include "opencv2/video/video.hpp"
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/videoio/videoio.hpp>
#include <opencv2/imgcodecs/imgcodecs.hpp>


using namespace std;
using namespace cv;

//Chose input

//VideoCapture capture(0);
VideoCapture capture("rtsp://USER:PASS@xxx.xxx.xxx.xxx/axis-media/media.amp?camera=2");
//VideoCapture capture("input.mp4");
// create mat to fill by external source
Mat frame;

for(;;)

{
       bool OK = capture.grab();
        if (OK == false){
        cout << "cannot grab" << endl;
        }
        else{
          // retrieve a frame of your source
           capture.read(frame);
          //OR
         // capture >> frame;
       }
}
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24 Comments
  • T.O.T.E
    T.O.T.E June 15, 2016 at 5:52 AM

    Hi

    I can read the rtsp stream using opencv 3.1 (compiled with ffmpeg) in python. But after some time I start getting corrupted frames and after further time I get error while reading the frames. Have you encountered it? If it works fine for you maybe I should use the versions you are using.

    Reply
  • Alex moner
    Alex moner May 15, 2017 at 5:05 AM

    Problem is instalation of Opencv without recommended dependencies.web design tutorials

    Reply
  • UplayOnline
    UplayOnline May 25, 2017 at 7:45 AM

    Video capture
    in opencv is really easy task, but for little bit experienced user.



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    Jims linda July 29, 2017 at 10:31 AM

    The issues which are giving us trouble can be sorted out with the help of these cameras. dashcam review

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  • Unknown
    Unknown September 19, 2017 at 8:01 PM

    How do i capture an H264 frames with OpenCV and Python?

    thanks

    Reply
  • Unknown
    Unknown September 19, 2017 at 8:02 PM

    How do i capture an H264 frames with OpenCV and Python?

    Thank You

    Reply
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  • jhon
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  • Unknown
    Unknown January 23, 2018 at 7:16 AM

    Hi! I would like to open a PAL camera using a frame grabber as interface between camera and software, What kind of path for videoCapture can i use? And what speficification do i have to use as input?
    Thanks a lot!

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  • Anonymous
    Anonymous November 27, 2018 at 1:46 AM

    Thanks for your post.
    I am facing error
    video_capture = cv2.VideoCapture(rtsp://104.156.100.16:554)
    after 100 or more than hundred frame video is freeze
    Error
    [h264 @ 0x204fedc0] error while decoding MB 41 1, bytestream -11
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    Hi all, i have problem to stream video using rtsp in python. But in VLC, my program is work.
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    I am using python 3.6 and opencv 3.4.4.

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