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Opencv VideoCapture File, Web Camera, RTSP stream

Opencv VideoCapture File, Camera and stream

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 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 .

You need to download and build my own in the case of Debian Jessie or some version of Ubuntu.
Just download, 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;
       }
}

Comments

  1. 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.

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

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



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

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

    thanks

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

    Thank You

    ReplyDelete
  7. save some money (you don't have a webcam) you can convert your phone to an instant webcam with this amazing software.. Hikvision 8MP Cameras

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  8. 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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  14. 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
    Thanks

    ReplyDelete
  15. Excellent Post as always and you have a great post and i like it


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  17. 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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