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    Sunday, 1 October 2017

    How to capture IP Camera http-stream and map to /dev/video* linux video driver


    Mapping HTTP MJPEG IP Camera Video feed to video device
    This is a very small concept but sometimes most useful logic that can solve biggest challenges if you want to get video feed wireless from IP Camera Android App or any other Pi Camera etc. Further, this method will map that HTTP mjpeg video stream to your linux video driver v4l. If you want to use opencv & process that IP Camera for facerecognition or else. Few, people tried to convert the string byte streams of video by cv2.imdecode() function from start & stop delimeters of streams but its was again needed to be converted to numpy array or opencv matrix array to get each frame to be processed which is very slow & requires lot processing from server side.


    Dependecies: 
    • Video4Linux: sudo apt-get install build-essential libjpeg8-dev imagemagick libv4l-dev v4l-utils checkinstall 
    •  VideoLoopback:
    Test your video drivers: ls /dev/video*
    Test your video stream formats: 
    http://<YOUR IP ADDRESS>/video
    http://<YOUR IP ADDRESS>/livestream.cgi?user=admin&pwd=&streamid=0&audio=0
    rtsp://IP:PORT/axis-cgi/mjpg/video.cgi
    http://IP:PORT/mjpg/video.mjpg 


    Read this for detailed info about IP Camera models & HTTP formats:
    http://funvision.blogspot.in/2016/11/ip-camera-video-stream-opencv-and.html

    Read this if you want to check for ffmpeg argument lists & input/output formats:
    https://linux.die.net/man/1/ffmpeg

    How to capture & map to camera device ID 1?

    Now, you can use cv2.VideoCapture(1) & get input video feed 

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    Item Reviewed: How to capture IP Camera http-stream and map to /dev/video* linux video driver Rating: 5 Reviewed By: Vishal Aditya
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