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• ValueError : I/O operation on closed file when making animation

  3 juillet 2018, par user3851187

  I am using matplotlib and ffmpeg to do some animations. I usually code on a remote server because the code runs faster ; we are having some issues making animations on the remote server. Here is an example of code that works perfectly on my local mac but does not work remotely.

  import matplotlib as mpl
  
  mpl.use('agg')
  
  import matplotlib as mpl 
  
  from matplotlib import animation
  
  import pylab
  
  
  
  def init():
  
      pylab.plot(pylab.arange(10), [0]*10)
  
  
  
  def redraw(frame):
  
      pylab.plot(pylab.arange(10), pylab.arange(10) * frame)
  
  
  
  fig = pylab.figure()
  
  ani = animation.FuncAnimation(fig, redraw, frames=10, interval=1000, init_func=init)
  
  ani.save('animation.mp4')

  I get the animation I want on my local machine (macOS Sierra). When I run it on the remote host (Debian GNU/Linux 8 (jessie)), I get the following error message after 5 frames

  Traceback (most recent call last):
  
    File "animation.py", line 14, in <module>
  
      ani.save('animation.mp4')
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 1200, in save
  
      writer.grab_frame(**savefig_kwargs)
  
    File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
  
      self.gen.throw(type, value, traceback)
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 241, in saving
  
      self.finish()
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 367, in finish
  
      self.cleanup()
  
    File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 405, in cleanup
  
      out, err = self._proc.communicate()
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 724, in communicate
  
      stdout, stderr = self._communicate(input, endtime, timeout)
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 1535, in _communicate
  
      orig_timeout)
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 1591, in _communicate_with_poll
  
      register_and_append(self.stdout, select_POLLIN_POLLPRI)
  
    File "/usr/local/lib/python2.7/dist-packages/subprocess32.py", line 1570, in register_and_append
  
      poller.register(file_obj.fileno(), eventmask)
  
  ValueError: I/O operation on closed file
  
  </module>

  My local machine uses matplotlib version 2.0.0 ; the remote machine uses matplotlib version 2.2.2

  On my local machine I have ffmpeg version 3.2.4

  $ ffmpeg -version
  
  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared - 
  
  -enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables 
  
  --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
  libavutil      55. 34.101 / 55. 34.101
  
  libavcodec     57. 64.101 / 57. 64.101
  
  libavformat    57. 56.101 / 57. 56.101
  
  libavdevice    57.  1.100 / 57.  1.100
  
  libavfilter     6. 65.100 /  6. 65.100
  
  libavresample   3.  1.  0 /  3.  1.  0
  
  libswscale      4.  2.100 /  4.  2.100
  
  libswresample   2.  3.100 /  2.  3.100
  
  libpostproc    54.  1.100 / 54.  1.100 

  On the remote host i have ffmpeg version 4.0.1

  ffmpeg -version
  
  ffmpeg version 4.0.1 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 4.9.2 (Debian 4.9.2-10+deb8u1)
  
  configuration: --prefix=/usr/local
  
  libavutil      56. 14.100 / 56. 14.100
  
  libavcodec     58. 18.100 / 58. 18.100
  
  libavformat    58. 12.100 / 58. 12.100
  
  libavdevice    58.  3.100 / 58.  3.100
  
  libavfilter     7. 16.100 /  7. 16.100
  
  libswscale      5.  1.100 /  5.  1.100
  
  libswresample   3.  1.100 /  3.  1.100

  If I recall correctly I installed ffmpeg locally through homebrew ; I have the anaconda distribution of python. On the remote machine we have the default version of python that comes with Jessie ; I’m not sure how the sysadmin installed ffmpeg.

  I am by no means an expert on ffmpeg, but I have generally never had issues with making animations in matplotlib on my local machine and I would really like to be able to make videos more quickly on the remote machine. Any help would be appreciated !

  Edit
  On the remote machine, the animation works if I use avconv as the writer instead of ffmpeg. I installed avconv locally...which led me to get the same ffmpeg issues locally (probably due to updating shared dependencies). However, I uninstalled ffmpeg and reinstalled it with x264 codec enables Animations in ipython (jupyter) notebook - ValueError : I/O operation on closed file

• libmp3lame ignore ffmpeg options, and can not change audio bitrate

  27 août 2018, par Ahmed

  i have java application to encode audio and send it via socket to server, i use ffmpeg to get compressed avpacket then send this packet via socket , the problem is the bandwidth is large than what is want, and can not control it, i try to set bitrate option to encoder (libmp3lame) but it’s ignore it completely, and i don not know is the problem from code or because i did not use ffmpeg libformat to send the packet to socket ?

  this how i open a codec

         codec = avcodec_find_encoder_by_name("libmp3lame");
  
          //codec = avcodec_find_encoder(AV_CODEC_ID_MP3);
  
  
  
          if(codec == null)
  
              throw new Exception("Codec not found");
  
  
  
          context = avcodec_alloc_context3(codec);
  
  
  
          if(context == null)
  
              throw new Exception("Could not allocate audio codec context");
  
  
  
          context.codec_tag(0);
  
          context.codec_id(AV_CODEC_ID_MP3);
  
          context.codec_type(AVMEDIA_TYPE_AUDIO);
  
  
  
          // set sample parameter
  
          context.bit_rate(audio_bitrate);
  
          context.sample_rate(samples_rate);
  
          context.channels(samples_channels);
  
          context.channel_layout(av_get_default_channel_layout(samples_channels));
  
          context.time_base().num(1).den(samples_rate);
  
  
  
          context.sample_fmt(AV_SAMPLE_FMT_S16);
  
          context.bits_per_raw_sample(16);        
  
  
  
          context.flags(context.flags() | AV_CODEC_FLAG_QSCALE);
  
          context.global_quality((int)Math.round(FF_QP2LAMBDA * audioQuality));
  
  
  
          if ((codec.capabilities() & AV_CODEC_CAP_EXPERIMENTAL) != 0) {
  
              context.strict_std_compliance(AVCodecContext.FF_COMPLIANCE_EXPERIMENTAL);
  
          }
  
  
  
          // priv_data()
  
          av_opt_set(context.priv_data() , "crf" , audioQuality + "" , 0);
  
          av_opt_set(context.priv_data() , "b" , "85" , 0);
  
          //av_opt_set(context.priv_data() , "V" , "2" , 0);
  
          //av_opt_set(context.priv_data() , "lowpass" , "120" , 0);
  
          av_opt_set(context.priv_data() , "abr" , "1" , 0);
  
  
  
          AVDictionary options = new AVDictionary(null);
  
          //av_dict_set(options, "crf", ""+audioQuality , 0);
  
          av_dict_set(options, "b:a", "8k" , 0);
  
          av_dict_set(options , "q:a" , "8" , 0);
  
          //av_dict_set(options , "lowpass" , "19.5" , 0);
  
          //av_dict_set(options, "b" , "8K" , 0);
  
  
  
  
  
          // open codec
  
          if (avcodec_open2(context, codec, (PointerPointer)null ) < 0) 
  
              throw new Exception("Could not open codec");
  
  ....

• on('progress') not working - node.js ytdl-core fluent-ffmpeg

  9 juillet 2018, par TheBandolero

  So i’m playing with this libraries ytdl-core and fluent-ffmpeg, and basically i got to this function by modifying some examples to fit what i wanted.

  everything works fine except for the second on('progress', progress => ....) call. The first one works as expected, but the second one looks like it isn’t even reached, since Console.log() inside the second on('progress'....) isn’t logging anything at all.

  Also console doesn’t show any errors throughout the whole function, and the outcome is the expected without any problem, except for the second on('progress') issue.

  I can’t figure out what the problem is, so I hope somebody with more experience can point the problem out to me, since it’s getting quite frustrating now...

  function descargarVideoHD(link) {
  
          ytdl.getInfo(link, (err, info) => {
  
              if (err) throw err;
  
  
  
              $('li:contains(' + link + ') .progress').css("visibility", "visible");
  
  
  
              var longitudEnTiempo = parseInt(info.length_seconds);
  
              let id = ytdl.getURLVideoID(link);
  
              var titulo = limpiarTituloDelVideo(info.title);
  
  
  
              let stream = ytdl(id, {
  
                  quality: 'highestaudio',
  
                  //filter: 'audioonly',
  
              });
  
  
  
              //var audioOutput = path.resolve(__dirname, 'audio_' + titulo + '.mp4');
  
              var mainOutput = path.resolve(__dirname, titulo + '.mp4');
  
              var renameFileName = titulo + '.mp4';
  
  
  
              var audioOutput = path.resolve(__dirname, titulo + '.mp3');
  
  
  
              ffmpeg(stream)
  
                  //.audioBitrate(128)
  
                  .audioBitrate(256)
  
                  .save(`${__dirname}/${titulo}.mp3`)
  
                  .on('progress', (p) => {
  
                      //readline.cursorTo(process.stdout, 0);
  
                      //process.stdout.write(`${p.targetSize}kb downloaded`);
  
                      var hmsA = p.timemark;
  
                      var aA = hmsA.split(':');
  
                      var secondsA = parseInt((+aA[0]) * 60 * 60 + (+aA[1]) * 60 + (+aA[2]));
  
                      var porcentageA = (((secondsA / longitudEnTiempo) * 100) / 2).toFixed(2);
  
                      $('li:contains(' + link + ') .progress .determinate').css("width", porcentageA + "%");
  
                      //console.log(titulo + ' procesado al ' + porcentage + '%');
  
                  })
  
                  .on('end', () => {
  
                      ffmpeg()
  
                          .input(ytdl(link, {
  
                              filter: format => {
  
                                  return format.container === 'mp4' && !format.audioEncoding;
  
                              }
  
                          }))
  
                          .videoCodec('copy')
  
                          .input(audioOutput)
  
                          .audioCodec('copy')
  
                          .save(mainOutput)
  
                          .on('error', console.error)
  
                          .on('progress', progress => {
  
                              console.log('Dentro de OnProgress...');
  
                              var hms = progress.timemark;
  
                              console.log('Timemark: ' + hms);
  
                              var a = hms.split(':');
  
                              var seconds = parseInt((+a[0]) * 60 * 60 + (+a[1]) * 60 + (+a[2]));
  
                              console.log('Segundos: ' + seconds);
  
                              var porcentage = ((((seconds / longitudEnTiempo) * 100) / 2) + 50).toFixed(2);
  
                              console.log('Procesado al ' + porcentage + '%');
  
                              $('li:contains(' + link + ') .progress .determinate').css("width", porcentage + "%");
  
                          }).on('end', () => {
  
                              fs.unlink(audioOutput, err => {
  
                                  if (err) {
  
                                      console.error(err);
  
                                  }
  
                                  else {
  
                                      $('li:contains(' + link + ') .progress .determinate').css("width", "100%");
  
                                      $('li:contains(' + link + ') .secondary-content.material-icons').text('done');
  
                                      $('li:contains(' + link + ') .secondary-content.material-icons').addClass('text-green');
  
                                      /* $('li:contains(' + link + ')').remove();
  
                                      var indexItem = listaEnlacesYoutube.indexOf(link);
  
                                      listaEnlacesYoutube.splice(indexItem, 1); */
  
                                  }
  
                              });
  
                          });
  
                  });
  
          });
  
      }