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  • ffmpeg : What is the best practice to keep a live connection/socket with a camera, and save time on ffprobe

    15 mai 2022, par Jeff Strongman

    Today... I used the following command : with subprocess.PIPE and subprocess.Popen in python 3 :

    


    ffmpeg -i udp://{address_of_camera} \
  -vf select='if(eq(pict_type,I),st(1,t),gt(t,ld(1)))' setpts=N/FRAME_RATE/TB \
  -f rawvideo -an -vframes {NUM_WANTED_FRAMES} pipe:`


    


    This command helps me to capture NUM_WANTED_FRAMES frames from a live camera at a given moment.

    


    However... it takes me about 4 seconds to read the frames, and about 2.5 seconds to open a socket between my computer and the camera's computer.

    


    Is there a way, to have a socket/connection always open between my computer and the camera's computer, to save the 2.5 seconds ?

    


    I read something about fifo_size and overrun_fatal. I thought that maybe I can set fifo_size to be equal to NUM_WANTED_FRAMES, and overrun_fatal to True ? Will this solve my problem ? Or is there a different and simpler/better solution ?

    


    Should I try to record always (no -vframes flag) store the frames in a queue(With max size), and upon a wish to slice the video, read from my queue buffer ? Will it work well with the keyframe ?

    


    Also... What to do when ffmpeg fails ? restart the ffmpeg command ?

    


  • creating a virtual microphone Ubuntu 16.04 and streaming audio into it from RTSP IP camera

    22 avril 2017, par sunsetjunks

    I need to create both virtual webcam and virtual microphone on an Ubuntu 16.04 machine for use in web application using WebRTC through my web browser.

    I need to feed video and audio to these 2 virtual devices from an IP camera (RTSP stream).
    Playing RTSP stream directly in VLC works fine with both video and audio.

    For this, I have created a /dev/video1 with video4linux2.
    I am able to feed the IP camera to /dev/video1.

    ffmpeg -i rtsp ://ip_address:554/streaming/channels/101/ -f v4l2
    /dev/video1

    If I look in VLC player, I can select /dev/video1 as a video device, but I have only "hw:0,0" as audio device, which is my in-built microphone.

    How to properly feed such RTSP stream to both virtual webcam and virtual microphone ?

  • creating a virtual microphone Ubuntu 16.04 and streaming audio into it from RTSP IP camera

    14 janvier 2021, par sunsetjunks

    I need to create both virtual webcam and virtual microphone on an Ubuntu 16.04 machine for use in web application using WebRTC through my web browser.

    



    I need to feed video and audio to these 2 virtual devices from an IP camera (RTSP stream). 
Playing RTSP stream directly in VLC works fine with both video and audio.

    



    For this, I have created a /dev/video1 with video4linux2.
I am able to feed the IP camera to /dev/video1.

    



    


    ffmpeg -i rtsp ://ip_address:554/streaming/channels/101/ -f v4l2
 /dev/video1

    


    



    If I look in VLC player, I can select /dev/video1 as a video device, but I have only "hw:0,0" as audio device, which is my in-built microphone.

    



    How to properly feed such RTSP stream to both virtual webcam and virtual microphone ?

    


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