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• FFmpeg command isn't working on Samsung

  30 avril 2016, par user4204805

  I have added the FFmpeg library to my android project.

  I am using the following code to slice my video using FFmpeg :

  String[] complexCommand = {"ffmpeg","-i",input.mp4,"-vf","crop="+surfaceWidth+":"+surfaceHeight+":"+surfaceStartX+":"+surfaceStartY,"-threads","5","-preset","ultrafast","-strict" ,"-2",output.mp4};

  It gives me the following error :

  A/libc: Fatal signal 11 (SIGSEGV) at 0x000f4240 (code=1), thread 17377 (IntentService[U)

  It works on most devices except for Samsung device (just checked on samsung grand). Please help.

• Why can I run this command from the terminal but I get an error when my python runs it from the terminal for me ?

  9 mai 2019, par mu234

  I’m trying to write a python script that basically captures webcam videos from the terminal. When I put the command in a string and use subprocess.call(script, True), I get an error, but when I literally copy/paste the same command to the terminal it works fine.

  This is my python :

  import subprocess
  
  import os
  
  if (os.path.isdir("Videos/Webcam/temp") is False):
  
      dirmake = 'mkdir Videos/Webcam/temp'
  
      subprocess.call(dirmake, True)
  
  cmd = 'ffmpeg -f v4l2 -i /dev/video0 -t 00:00:10 video.webm'
  
  subprocess.call(cmd, True)

  and this is the error

  `FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg -f v4l2 -i /dev/video0 -t 00:00:10 video.webm': 'ffmpeg -f v4l2 -i /dev/video0 -t 00:00:10 video.webm'`

  If I just run ffmpeg -f v4l2 -i /dev/video0 -t 00:00:10 video.webm from the terminal it works fine.

  Originally the video was supposed to go in Videos/Webcam/temp but I took it out to see if the error had something to do with where I was putting the video. I’m using Ubuntu 18.04.2 LTS if that makes a difference.

• Real time livestreaming - RPI

  24 avril 2022, par Victor

  I work at a telehealth company and we are using connected medical devices in order to provide the doctor with real time information from these equipements, the equipements are used by a trained health Professional.

  


  Those devices work with video and audio. Right now, we are using them with peerjs (so peer to peer connection) but we are trying to move away from that and have a RPI with his only job to stream data (so streaming audio and video).

  


  Because the equipements are supposed to be used with instructions from a doctor we need the doctor to receive the data in real time.

  


  But we also need the trained health professional to see what he is doing (so we need a local feed from the equipement)

  


  How do we capture audio and video

  


  We are using ffmpeg with a go client that is in charge of managing the ffmpeg clients and stream them to a SRS server.
This works but we are having a 2-3 sec delay when streaming the data. (rtmp from ffmpeg and flv on the front end)

  


  ffmpeg settings :

  


  ("ffmpeg", "-f", "v4l2", `-i`, "*/video0", "-f", "flv", "-vcodec", "libx264", "-x264opts", "keyint=15", "-preset", "ultrafast", "-tune", "zerolatency", "-fflags", "nobuffer", "-b:a", "160k", "-threads", "0", "-g", "0", "rtmp://srs-url")


  


  My questions

  


  

  • Is there a way for this set up to achieve low latency (<1 sec) (for the nurse and for the doctor) ?

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  • Is the way I want to achieve this good ? Is there a batter way ?

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  Flow schema

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  Data exchange and use case flow

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