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• When generating a video from images and adding audio the video isn't playable

  1er août 2017, par randommman

  So I have a bunch of images in a folder, with the following structure :

  image-0.png
  
  image-1.png
  
  image-2.png

  Sometimes the folder can have just 1 image which will be saved as :

  image-0.png

  My code to generate the video and to add the audio

  // create the file
  
  using (WaveFileReader wf = new WaveFileReader(Audio))
  
  {
  
      // the files
  
      OldVideo = "old.avi";
  
      NewVideo = "video.avi";
  
      Audio = "sound.wav";
  
  
  
      // Get the time of the audio and divide by images
  
      time = wf.TotalTime.TotalSeconds;
  
      mimtime = time / imagescount;
  
  
  
      ffmpegPath = "ffmpeg.exe";
  
      ffmpegParams = " -r 1/" + mimtime + " -i " + ImagesFolder + "image-%d.png -t " + time + " -y -vf scale=1280:-2 " + OldVideo;
  
      ffmaudioParams = " -i " + OldVideo + " -i " + Audio + " -c copy -shortest " + NewVideo;
  
  }
  
  
  
  
  
  using (Process ffmpeg = new Process())
  
  {
  
      //Generate video
  
      ffmpegstartInfo = new ProcessStartInfo();
  
      ffmpegstartInfo.FileName = ffmpegPath;
  
      ffmpegstartInfo.Arguments = ffmpegParams;
  
      ffmpegstartInfo.RedirectStandardOutput = true;
  
      ffmpegstartInfo.RedirectStandardError = true;
  
      ffmpegstartInfo.UseShellExecute = false;
  
      ffmpegstartInfo.CreateNoWindow = true;
  
  
  
      ffmpeg.StartInfo.FileName = ffmpegPath;
  
      ffmpeg.StartInfo.Arguments = ffmpegParams;
  
      ffmpeg.StartInfo = ffmpegstartInfo;
  
      ffmpeg.Start();
  
      ffmpeg.WaitForExit(30000);
  
  
  
  
  
      /*ffmpeg.StartInfo.FileName = "cmd.exe";
  
      ffmpeg.StartInfo.Arguments = "/k " + ffmpegPath + " " + ffmpegParams;
  
      ffmpeg.Start();
  
      ffmpeg.WaitForExit(30000);*/
  
  }
  
  
  
  using (Process ffmaudio = new Process())
  
  {
  
      //Add audio to video
  
      ffmaudiostartInfo = new ProcessStartInfo();
  
      ffmaudiostartInfo.FileName = ffmpegPath;
  
      ffmaudiostartInfo.Arguments = ffmaudioParams;
  
      ffmaudiostartInfo.RedirectStandardOutput = true;
  
      ffmaudiostartInfo.RedirectStandardError = true;
  
      ffmaudiostartInfo.UseShellExecute = false;
  
      ffmaudiostartInfo.CreateNoWindow = true;
  
  
  
      ffmaudio.StartInfo.FileName = ffmpegPath;
  
      ffmaudio.StartInfo.Arguments = ffmaudioParams;
  
      ffmaudio.StartInfo = ffmaudiostartInfo;
  
      ffmaudio.Start();
  
      ffmaudio.WaitForExit(30000);
  
  
  
      /*ffmaudio.StartInfo.FileName = "cmd.exe";
  
      ffmaudio.StartInfo.Arguments = "/k " + ffmpegPath + " " + ffmaudioParams;
  
      ffmaudio.Start();
  
      ffmaudio.WaitForExit(30000);*/
  
  }

  So, what my code does, with the wavfilereader it gets the total length of my audio file, and then splits that time up by the number of images I have, so I can generate a video with the images split equally. Then I generate the video to a file called ’old.avi’, which is then used with my wav file to generate a new file called video.avi (which I am trying to have the generated video and audio together)

  My problem is when I generate the video it becomes uplayable. It claims to be (for example) 1 minute 50 seconds long, but once I click it, it won’t play. It just becomes unplayable, as you can see below

  http://i.imgur.com/tsck2NX.gifv

  I am using C# with process and Winforms, which opens the cmd line to run ffmpeg, with the 2 commands called above with the named variables below :

  ffmpegParams;
  
  ffmaudioParams;

  Which has all the commands I am using

  -r 1/ (audio length /divided by total images) so they're equal
  
  -t (to limit to the total time which is the audio's total seconds)
  
  ... I am using more as you can see in my code above

  How can I fix my problem, that I have described ?

  CMD line when generating the video :

  ffmpeg version N-86848-g03a9e6f Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 68.100 / 55. 68.100
  
    libavcodec     57.102.100 / 57.102.100
  
    libavformat    57. 76.100 / 57. 76.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 95.100 /  6. 95.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, image2, from 'C:\Users\Laptop\Documents\program/images/image-%d.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 800x800, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> mpeg4 (native))
  
  Press [q] to stop, [?] for help
  
  [mpeg4 @ 00000000024f44a0] bitrate tolerance 4000000 too small for bitrate 200000, overriding
  
  Output #0, avi, to 'C:\Users\Laptop\Documents\program/old.avi':
  
    Metadata:
  
      ISFT            : Lavf57.76.100
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x1280, q=2-31, 200 kb/s, 0.01 fps, 0.01 tbn, 0.01 tbc
  
      Metadata:
  
        encoder         : Lavc57.102.100 mpeg4
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  frame=    1 fps=0.0 q=6.8 Lsize=      46kB time=00:01:37.57 bitrate=   3.9kbits/s speed=1.43e+003x
  
  video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 13.641467%

  When adding the audio to the video

  ffmpeg version N-86848-g03a9e6f Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 68.100 / 55. 68.100
  
    libavcodec     57.102.100 / 57.102.100
  
    libavformat    57. 76.100 / 57. 76.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 95.100 /  6. 95.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, avi, from 'C:\Users\Laptop\Documents\program/old.avi':
  
    Metadata:
  
      encoder         : Lavf57.76.100
  
    Duration: 00:01:37.58, start: 0.000000, bitrate: 3 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x1280 [SAR 1:1 DAR 1:1], 0.01 fps, 0.01 tbr, 0.01 tbn, 40 tbc
  
  Guessed Channel Layout for Input Stream #1.0 : mono
  
  Input #1, wav, from 'C:\Users\Laptop\Documents\program/audio.wav':
  
    Duration: 00:01:37.57, bitrate: 352 kb/s
  
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
  
  Output #0, avi, to 'C:\Users\Laptop\Documents\program/video.avi':
  
    Metadata:
  
      ISFT            : Lavf57.76.100
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x1280 [SAR 1:1 DAR 1:1], q=2-31, 0.01 fps, 0.01 tbr, 0.01 tbn, 0.01 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=-1.0 Lsize=      55kB time=00:01:37.57 bitrate=   4.6kbits/s speed=1.95e+005x
  
  video:41kB audio:4kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 21.946869%

• Monit not restarting ffmpeg live stream when disconnected

  21 juillet 2017, par digibread

  No matter what I try I cannot get Monit to restart my ffmpeg live stream even though my bash script works from the command line. I start the ffmpeg live stream and all is working. Monit status shows that is ffmpeg is running. I then reboot the camera and the connection is lost, Monit tries to start it with the log file entries below. the config files.
  Here is my setup. Any help is greatly appreciated.

  Monit Status

  Process 'ffmpeg'
  
  status                       Running
  
  monitoring status            Monitored
  
  monitoring mode              active
  
  on reboot                    start
  
  pid                          17349
  
  parent pid                   1
  
  uid                          0
  
  effective uid                0
  
  gid                          0
  
  uptime                       0m
  
  threads                      1
  
  children                     0
  
  cpu                          0.0%
  
  cpu total                    0.0%
  
  memory                       8.3% [40.4 MB]
  
  memory total                 8.3% [40.4 MB]
  
  port response time           -
  
  data collected               Fri, 21 Jul 2017 15:36:31

  My bash file in /etc/init.d/monitoring1.sh

  #!/bin/bash
  
  pid_file="/var/run/ffmpeg.pid"
  
  
  
  case "$1" in
  
   restart)
  
      /etc/init.d/monitoring1.sh stop
  
      /etc/init.d/monitoring1.sh start
  
       ;;
  
  
  
   start)
  
      rm $pid_file
  
      /usr/bin/ffmpeg -timeout -1 -i rtsp://user:pw@mydomain:port/h264Preview_01_sub http://localhost:8090/monitoring1.ffm &
  
      ch_pid=$!
  
      echo "Start Monitoring1: ffmpeg = $ch_pid";
  
      echo $ch_pid > $pid_file
  
       ;;
  
  
  
   stop)
  
      echo "Stop ffmpeg Monitoring1";
  
      kill `cat $pid_file` &> /dev/null
  
       ;;
  
  *)
  
     echo "Usage: /etc/init.d/streambash.sh {start|stop|restart}"
  
     exit 1
  
      ;;
  
  esac
  
  exit 0
  
  echo $pid_file

  My /etc/monit/conf-available/ffmpeg

  check process ffmpeg with pidfile /var/run/ffmpeg.pid
  
  group nogroup
  
  start program = "/bin/bash /etc/init.d/monitoring1.sh start"
  
  stop program = "/bin/bash /etc/init.d/monitoring1.sh stop"
  
  if failed host localhost port 8090 type tcp with timeout 15 seconds for 5 cycles
  
     then restart

  /var/log/monit.log

  [UTC Jul 21 15:36:31] info     : 'ffmpeg' process is running with pid 17349
  
  [UTC Jul 21 15:36:31] debug    : 'ffmpeg' zombie check succeeded
  
  [UTC Jul 21 15:36:31] debug    : 'ffmpeg' connection test paused for 13 s while the process is starting
  
  [UTC Jul 21 15:37:01] debug    : 'ffmpeg' process is running with pid 17349
  
  [UTC Jul 21 15:37:01] debug    : 'ffmpeg' zombie check succeeded
  
  [UTC Jul 21 15:37:01] debug    : 'ffmpeg' succeeded testing protocol [DEFAULT] at [localhost]:8090 [TCP/IP] [response time 1.152 ms]
  
  [UTC Jul 21 15:37:01] debug    : 'ffmpeg' connection succeeded to [localhost]:8090 [TCP/IP]
  
  [UTC Jul 21 15:43:02] debug    : 'ffmpeg' process test failed [pid=17349] -- No such process
  
  [UTC Jul 21 15:43:02] error    : 'ffmpeg' process is not running
  
  [UTC Jul 21 15:43:02] info     : 'ffmpeg' trying to restart
  
  [UTC Jul 21 15:43:02] debug    : 'ffmpeg' process test failed [pid=17349] -- No such process
  
  [UTC Jul 21 15:43:02] debug    : 'ffmpeg' process test failed [pid=17349] -- No such process
  
  [UTC Jul 21 15:43:02] info     : 'ffmpeg' start: '/bin/bash /etc/init.d/monitoring1.sh start'
  
  [UTC Jul 21 15:43:02] debug    : Start Monitoring1: ffmpeg = 17421
  
  [UTC Jul 21 15:43:02] debug    : 'ffmpeg' started
  
  [UTC Jul 21 15:43:32] debug    : 'ffmpeg' process test failed [pid=17421] -- No such process
  
  [UTC Jul 21 15:43:32] error    : 'ffmpeg' process is not running
  
  [UTC Jul 21 15:43:32] info     : 'ffmpeg' trying to restart
  
  [UTC Jul 21 15:43:32] debug    : 'ffmpeg' process test failed [pid=17421] -- No such process
  
  [UTC Jul 21 15:43:32] debug    : 'ffmpeg' process test failed [pid=17421] -- No such process
  
  [UTC Jul 21 15:43:32] info     : 'ffmpeg' start: '/bin/bash /etc/init.d/monitoring1.sh start'
  
  [UTC Jul 21 15:43:32] debug    : Start Monitoring1: ffmpeg = 17430
  
  [UTC Jul 21 15:43:32] debug    : 'ffmpeg' started
  
  [UTC Jul 21 15:44:02] debug    : 'ffmpeg' process test failed [pid=17430] -- No such process
  
  [UTC Jul 21 15:44:02] error    : 'ffmpeg' process is not running
  
  [UTC Jul 21 15:44:02] info     : 'ffmpeg' trying to restart
  
  [UTC Jul 21 15:44:02] debug    : 'ffmpeg' process test failed [pid=17430] -- No such process
  
  [UTC Jul 21 15:44:02] debug    : 'ffmpeg' process test failed [pid=17430] -- No such process
  
  [UTC Jul 21 15:44:02] info     : 'ffmpeg' start: '/bin/bash /etc/init.d/monitoring1.sh start'
  
  [UTC Jul 21 15:44:02] debug    : Start Monitoring1: ffmpeg = 17436
  
  [UTC Jul 21 15:44:02] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:03] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:03] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:04] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:05] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:06] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:07] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:08] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:09] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:10] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:11] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:12] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:13] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:14] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:15] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:16] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:17] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:18] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:19] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:20] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:21] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:22] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:23] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:24] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:25] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:26] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:27] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:28] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:29] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:30] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:31] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:32] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:44:32] error    : 'ffmpeg' failed to start (exit status 0) -- '/bin/bash /etc/init.d/monitoring1.sh start': Start Monitoring1: ffmpeg = 17436
  
  [UTC Jul 21 15:45:02] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:45:02] error    : 'ffmpeg' process is not running
  
  [UTC Jul 21 15:45:02] info     : 'ffmpeg' trying to restart
  
  [UTC Jul 21 15:45:02] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:45:02] debug    : 'ffmpeg' process test failed [pid=17436] -- No such process
  
  [UTC Jul 21 15:45:02] info     : 'ffmpeg' start: '/bin/bash /etc/init.d/monitoring1.sh start'
  
  [UTC Jul 21 15:45:03] debug    : Start Monitoring1: ffmpeg = 17448
  
  [UTC Jul 21 15:45:03] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:03] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:03] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:04] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:06] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:07] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:08] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:09] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:10] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:11] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:12] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:13] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:14] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:15] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:16] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:17] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:18] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:19] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:20] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:21] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:22] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:23] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:24] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:25] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:26] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:27] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:28] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:29] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:30] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:31] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:32] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:33] debug    : 'ffmpeg' process test failed [pid=17448] -- No such process
  
  [UTC Jul 21 15:45:33] error    : 'ffmpeg' failed to start (exit status 0) -- '/bin/bash /etc/init.d/monitoring1.sh start': Start Monitoring1: ffmpeg = 17448

• Piwik Analytics and becoming a Piwik Certified Professional

  10 juillet 2017, par Piwik Core Team — About

  Digital Analytics software

  Piwik Analytics is the leading open source digital analytics software, offering users around the world an opportunity to liberate their analytics. Most recently, they have introduced the Piwik Certified Professional certification exam which now allows users to become qualified in Piwik Analytics software on an individual level to gain a deeper understanding of Piwik. In this blog post I will guide you through the topics that are covered during the exam and provide you with advice on taking the official Piwik Certified Professional exam.

  

  Piwik certification exam

  Taking the exam will cost you a maximum investment of 60 minutes of your time, besides learning all materials of course. The exam consists of 55 multiple choice questions with four answers to choose from. The score needed to pass is 80% (44 questions answered correctly) and the cost is 50 USD total. An earned certificate is valid for 18 months, before these eighteen months are over a person should pass the exam again in order to retain the certified status.

  Learning topics

  The exam consists of two sections. The main section is focused on the Piwik Analytics software itself while the second part relates to digital analytics in general. All topics and content covered about Piwik Analytics is available through the official Piwik user guides. The second section tests your experience as a digital analyst, online marketer or any other function title in which you work with Piwik Analytics. In this case, the general digital analytics questions should be quite straightforward and easy to answer, and cover only a fraction of the total questions in the exam (around 10% with 5-7 general questions). An outline of all exam topics are listed below :

  • A Tour of Piwik
  • Track Goals and Measure Conversions
  • Event Tracking
  • Content Tracking
  • Ecommerce Analytics
  • Row Evolution – View and compare historical data
  • Segmentation – Compare segments of visitors
  • Visitors Maps – World, region, city
  • Real Time Visitor World Map
  • Real Time Analytics
  • The Visitor Profile
  • Site speed and Page speed
  • Site Search Tracking and Reporting
    
  • Transitions – Analyze the previous and following actions of your visitors for each page
  • Page Overlay
  • Custom Variables Analytics
  • Custom Dimensions
  • User ID
  • Annotating your data
  • Tracking Campaigns
  • URL Builder for Marketing Campaign Tracking

  The best way to prepare for the exam is read the entire Piwik user guides. You should definitely read the “Analytics Features” section since most questions of the Piwik Certified Professional – Digital Analytics exam that will be asked come from these sections. Furthermore you should be able to find your way around in Piwik at a basic level which means you know what the reports mean and where to find certain information. In addition, some basic knowledge regarding the settings is useful too. The exam is definitely not a technical implementation exam so no coding knowledge or any other deeply technical knowledge regarding Piwik is required.

  Finally, some general questions will be asked regarding digital analytics covering topics about KPI’s and the role of the analyst within an organization. While Piwik provides some links to articles by Avinash Kaushik covering these topics, you will not be able to learn these topics just by reading. When you have some experience with digital analytics you should be able to answer these general digital analytics questions with common sense and (even basic) experience as a digital analyst, analytics consultant, online marketer or any other related job whereby you work with Piwik.

  Taking the exam

  With 55 questions to be answered in 60 minutes the key to passing the exam is to keep moving. You have about 1 minute and 5 seconds to answer each question. This means that you should focus on the easiest questions first and return later to the questions that are a bit more challenging to answer. Keep an eye on the timer that will be displayed in the exam window. When the time expires or you click ‘Finish test’ your exam will end and be automatically submitted for review. Remember to first check all questions and answers before you click on the ‘Finish test’ button. If you click too soon and you still haven’t answered all questions, all unanswered questions will be marked as incorrect.

  During the test, no hard copy or online materials may be referenced. As you can imagine, it is almost impossible to check if users reference these kind of materials. However, be aware of the penalty system that is in place during the test. When a user leaves from the active test screen to another screen (i.e. a different browser tab) the screen turns red and provides a warning count when the user returns to the test screen again. You will have three warnings, after this your test will be submitted and graded as false. Furthermore, keep in mind you will have to do the test in one go and cannot pause and come back another time.

  Practice makes perfect

  Below I have included some example questions that could be asked during the exam. These questions do not necessarily represent how Piwik will test you on these topics.

  • What is the default report date that is selected by Piwik ?
  • Why would someone flatten a report in Piwik ?
  • Why would a user especially use the Page Overlay report ?
  • What are the three main Ecommerce interactions tracked with Piwik ?
  • What is an example of an anonymized IP address in Piwik ?

  Passing the Piwik Certified Professional – Digital Analytics exam

  Directly after submitting the exam you will receive a notification telling you whether or not you have passed the exam. If you pass, you will be able to download your personal certification right away. A report of your exam performance will also be available. This report lists the amount of correct answers and total questions by topic. The report with your exam performance is also available if you did not pass the exam. The certificate is valid for 18 months from the date of successful completion.

  Sometimes the difference between passing and failing can be a matter of how you interpret some of Piwik’s questions. There are several tricky questions included, so be sure to pay attention to detail on every question. If you fail, you may take the exam again. You will have to pay the 50 USD fee for each try, so do your best to pass it the first time.

  → Register to become a Piwik Certified Professional.

  We wish you the best of luck and happy analytics !