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• How to Kill ffmpeg process in node.js

  8 février 2017, par Sanjay

  I am using node.js code that convert Axis Ipcamera live stream into mp4 using FFMPEG

   var childProcess=require('child_process');
  
   var childArguments = [];
  
  var child=[];
  
  var cmd='ffmpeg -i rtsp://172.24.22.117:554/axis-media/media.amp -vcodec libx264 -pix_fmt yuv420p -profile:v baseline -preset slower -crf 18 -vf "scale=trunc(in_w/2)*2:trunc(in_h/2)*2"'+' '+__dirname+'/uploads/ouput.mp4';
  
  
  
    child=childProcess.exec(       
  
          cmd,
  
          childArguments,
  
          {            
  
              env: process.env,
  
              silent:true
  
          },  function (err, stdout, stderr) {
  
              if (err) {
  
                  throw err;
  
              }
  
              console.log(stdout);
  
  
  
          });     
  
  
  
          //    here generate events for listen child process (works properly)
  
      // Listen for incoming(stdout) data
  
      child.stdout.on('data', function (data) {
  
          console.log("Got data from child: " + data);
  
      });
  
  
  
      // Listen for any errors:
  
      child.stderr.on('data', function (data) {
  
          console.log('There was an error: ' + data);
  
      });
  
  
  
      // Listen for exit event
  
      child.on('exit', function(code) {
  
          console.log('Child process exited with exit code ' + code);
  
          child.stdout.pause();
  
          child.kill();
  
      });

  my above code works perfectly. It gives the output as I want, but I am not able to kill(stop) the ffmpeg command. I am using the code below for stopping the process, but in background it still continues.

  child.kill("SIGTERM"); 

  I also used following commands : child.kill(’SIGUSR1’) ; child.kill("SIGHUP") ; child.kill("SIGINT") ;child.kill(’SIGUSR2’) ; for killing this process but it not works.

  Currently I forcefully kill the node application to stop ffmpeg command and generate mp4 file. I do not want this.
  But I want commands that stop ffmpeg process and generate mp4 file, without killing the node application.

• Need A Besh / Shall Script For Run FFmpeg and Check Error Of Live Streaming

  27 janvier 2019, par Rakibulkst

  Anyone have a Bash/Shall script for run FFmpeg Live Stream Command and checking live streaming error and fix by itself. I try to make it but I become fail because I don’t have enough knowledge about shall script. Can you help me to make this ? I also want to reduce my streaming buffering.

  #!/bin/bash
  
  while :; do
  
      ffmpeg -re -i input.ts or m3u8 or just input -r 30 -g 60 -c:v copy -c:a copy -c:s copy -x264-params keyint=60 -bufsize 500k -c:a aac -strict -2 -ar 44100 -b:a 128k -f flv rtmp://xxx-xx-xxx/application/Stream Key null > /dev/null 2>&1
  
  done &

• AAC Bash script pass through slower than transcoding ?

  13 février 2015, par Threster

  I made a script for my Subsonic server which recognizes ALAC (lossless) from AAC (lossy) files. Because iTunes gives them both m4a extensions. ALAC gets transcoded, AAC is passed through. Only the pass through for AAC is 2-3x slower than the transcoding of ALAC ?

  I checked the aac files with the qt-faststart utility of ffmpeg for the moov atoms. qt-faststart gives output like this :

  ftyp          0 32
  
  moov         32 39003
  
  free      39035 38781
  
  mdat      77816 6479293
  
  last atom in file was not a moov atom

  So I think the moov atoms are in the beginning, which would be ok.

  Code of the actual bash script :

  #!/bin/sh
  
  # Author: poctum + Threster
  
  DEBUG=TRUE
  
  # Locations of various programs required
  
  FFMPEG=/usr/bin/ffmpeg
  
  CAT=/bin/cat
  
  FFPROBE=/usr/bin/ffprobe
  
  GREP=/bin/grep
  
  # Defaults and other variables 
  
  INFILE=$1
  
  MAXBITRATE=256
  
  
  
  # Send data to StdOut for echo's to show up in subsonic.log
  
  debugout() 
  
  {
  
      if [ $DEBUG = TRUE ]; then 
  
          echo "$@" 1>&2
  
      fi
  
  }
  
  
  
  # Capture the INFILE codec type, and then trim it.
  
  TUSSENCODEC=`$FFPROBE -v error -show_streams "$INFILE" | $GREP codec_name` 
  
  INCODEC=${TUSSENCODEC#*=}
  
  debugout  "tussencodec is $TUSSENCODEC and incodec is $INCODEC"
  
  
  
  if [ -z "${INCODEC}" ] ; then
  
      debugout "no codec detected in $INFILE inputfile"
  
  elif [ $INCODEC = aac ] ; then
  
      debugout "print $INCODEC is aac so  pass trough"
  
      $CAT "$INFILE" < /dev/null
  
  else
  
      debugout " print $INCODEC is  not aac so encoding to aac"
  
      $FFMPEG -i "$INFILE" -nostdin -c:a libfdk_aac -movflags +faststart -b:a "$MAXBITRATE"k -vn -f adts - < /dev/null
  
  fi