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• FFMpeg Command work in command line, but not in python script

  20 février 2015, par Fooldj

  Okay, kind of a weird problem. But I’m not sure whether it’s python, ffmpeg, or some stupid thing I’m doing wrong.

  I’m trying to take a video, and take 1 frame a second, and output that frame to an image. Right now, if i use the command line with ffmpeg :

  ffmpeg -i test.avi -r 1 -f image2 image-%3d.jpeg -pix_fmt rgb24 -vcodec rawrvideo

  It outputs about 10 images, the images look fine, awesome. Now I have this code (right now some code from some github, as I wanted stuff that i was relatively sure would work, and mine is allll convoluted)

  import subprocess as sp
  
  import numpy as np
  
  import re
  
  import cv2
  
  import time
  
  
  
  FFMPEG_BIN = r'ffmpeg.exe'
  
  INPUT_VID = 'test.avi'
  
  
  
  def getInfo():
  
      command = [FFMPEG_BIN,'-i', INPUT_VID, '-']
  
      pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE)
  
      pipe.stdout.readline()
  
      pipe.terminate()
  
      infos = pipe.stderr.read()
  
      infos_list = infos.split('\r\n')
  
      res = re.search(' \d+x\d+ ',infos)
  
      res = [int(x) for x in res.group(0).split('x')]
  
      return res
  
  res = getInfo()
  
  command = [ FFMPEG_BIN,
  
          '-i', INPUT_VID,
  
          '-f', 'image2pipe',
  
          '-pix_fmt', 'rgb24',
  
          '-vcodec', 'rawvideo', '-']
  
  pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
  
  n = 0
  
  im2 = []
  
  try:
  
      mog = cv2.BackgroundSubtractorMOG2(120,2,True)
  
      while True:
  
          raw_image = pipe.stdout.read(res[0]*res[1]*3)
  
          # transform the byte read into a numpy array
  
          image =  np.fromstring(raw_image, dtype='uint8')
  
          image = image.reshape((res[1],res[0],3))
  
          rgbImg = image.copy()
  
  
  
          fname = ('_tmp%03d.png'%time.time())
  
          cv2.imwrite(fname, rgbImg)
  
          # throw away the data in the pipe's buffer.
  
          #pipe.stdout.flush()
  
          n += 1
  
          print n
  
  except:
  
      print 'done',n
  
      pipe.kill()
  
      cv2.destroyAllWindows()

  When I run this, I get 10 images, but they all have a Blue Tint ! I cannot for the life of me figure out why. I’ve done tons of searches, I’ve tried quite a few different codecs (usually just messes things up worse). The media info for the video file is here :

   General
  
   Complete name                            : test.avi
  
  Format                                   : AVI
  
  Format/Info                              : Audio Video Interleave
  
  File size                                : 85.0 KiB
  
  Duration                                 : 133ms
  
  Overall bit rate                         : 5 235 Kbps
  
  
  
  Video
  
  ID                                       : 0
  
  Format                                   : JPEG
  
  Codec ID                                 : MJPG
  
  Duration                                 : 133ms
  
  Bit rate                                 : 1 240 Kbps
  
  Width                                    : 640 pixels
  
  Height                                   : 480 pixels
  
  Display aspect ratio                     : 4:3
  
  Frame rate                               : 30.000 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:2
  
  Bit depth                                : 8 bits
  
  Compression mode                         : Lossy
  
  Bits/(Pixel*Frame)                       : 0.135
  
  Stream size                              : 20.1 KiB (24%)

  Any suggestions ? It seems like it should be an RGB mixup...just not sure where at...

• 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.

• Error : Package : perl-Git-1.8.2.1-1.el5.x86_64 (epel) Requires : perl(:MODULE_COMPAT_5.8.8)

  23 décembre 2014, par P C SAS3

  error in loading github lib tool

  i have tried to load the following dependencies to load ffmpeg from source when i try to run the following command i am getting errors as below

  yum install autoconf automake gcc gcc-c++ git libtool make nasm pkgconfig zlib-devel
  
  Loaded plugins: fastestmirror
  
  Loading mirror speeds from cached hostfile
  
   * base: mirrors.viethosting.vn
  
   * epel: ftp.cuhk.edu.hk
  
   * extras: mirrors.viethosting.vn
  
   * updates: mirrors.vinahost.vn
  
  base                                                     | 3.7 kB     00:00     
  
  epel                                                     | 3.7 kB     00:00     
  
  epel/primary_db                                          | 3.7 MB     00:18     
  
  extras                                                   | 3.4 kB     00:00     
  
  updates                                                  | 3.4 kB     00:00     
  
  updates/primary_db                                       | 1.5 MB     00:16     
  
  vz-base                                                  |  951 B     00:00     
  
  vz-updates                                               |  951 B     00:00     
  
  Setting up Install Process
  
  Package autoconf-2.63-5.1.el6.noarch already installed and latest version
  
  Package automake-1.11.1-4.el6.noarch already installed and latest version
  
  Package gcc-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package gcc-c++-4.4.7-11.el6.x86_64 already installed and latest version
  
  Package 1:make-3.81-20.el6.x86_64 already installed and latest version
  
  Package 1:pkgconfig-0.23-9.1.el6.x86_64 already installed and latest version
  
  Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version
  
  Resolving Dependencies
  
  --> Running transaction check
  
  ---> Package git.x86_64 0:1.8.2.1-1.el5 will be installed
  
  --> Processing Dependency: perl-Git = 1.8.2.1-1.el5 for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: perl(Term::ReadKey) for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: perl(Git) for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: perl(Error) for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: libssl.so.6()(64bit) for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: libexpat.so.0()(64bit) for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: libcurl.so.3()(64bit) for package: git-1.8.2.1-1.el5.x86_64
  
  --> Processing Dependency: libcrypto.so.6()(64bit) for package: git-1.8.2.1-1.el5.x86_64
  
  ---> Package libtool.x86_64 0:2.2.6-15.5.el6 will be installed
  
  ---> Package nasm.x86_64 0:2.07-7.el6 will be installed
  
  --> Running transaction check
  
  ---> Package compat-expat1.x86_64 0:1.95.8-8.el6 will be installed
  
  ---> Package git.x86_64 0:1.8.2.1-1.el5 will be installed
  
  --> Processing Dependency: libcurl.so.3()(64bit) for package: git-1.8.2.1-1.el5.x86_64
  
  ---> Package openssl098e.x86_64 0:0.9.8e-18.el6_5.2 will be installed
  
  ---> Package perl-Error.noarch 1:0.17015-4.el6 will be installed
  
  ---> Package perl-Git.x86_64 0:1.8.2.1-1.el5 will be installed
  
  --> Processing Dependency: perl(:MODULE_COMPAT_5.8.8) for package: perl-Git-1.8.2.1-1.el5.x86_64
  
  ---> Package perl-TermReadKey.x86_64 0:2.30-13.el6 will be installed
  
  --> Finished Dependency Resolution
  
  Error: Package: perl-Git-1.8.2.1-1.el5.x86_64 (epel)
  
             Requires: perl(:MODULE_COMPAT_5.8.8)
  
  Error: Package: git-1.8.2.1-1.el5.x86_64 (epel)
  
             Requires: libcurl.so.3()(64bit)
  
   You could try using --skip-broken to work around the problem
  
   You could try running: rpm -Va --nofiles --nodigest

  now i went into some solution on net which asked to check with disablerepo to rpmforge it also throw the following error

  # yum --disablerepo=rpmforge install git
  
  Loaded plugins: fastestmirror
  
  
  
  
  
  Error getting repository data for rpmforge, repository not found

  kindly help so that i can install all the dependencies so that i may not face any problem while configuring ffmpge