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• Python - getting duration of a video with ffprobe and splitting the video into pieces

  22 octobre 2018, par ZelelB

  I am trying to split a video with ffmpeg, implementing a python script.

  I am getting this error :

  Command '['ffprobe', '-i', 'path_to_my_video/MVI_0731.MP4', '-hide_banner']' returned non-zero exit status 1.

  Here is the code I am using to split the video :

  for video_file in video_files:
  
          try:
  
              # Call "ffprobe" to get duration of input video.
  
              ffprobe_process = subprocess.run(args=["ffprobe", "-i", video_file, "-hide_banner"],
  
                                             check=True,
  
                                             stdout=subprocess.PIPE,
  
                                             stderr=subprocess.PIPE,
  
                                             encoding="utf-8",
  
                                             shell=True)
  
  
  
              # "ffprobe" writes to stderr instead of stdout!
  
              duration_string = extract_duration_from_ffprobe_output(ffprobe_process.stderr)            
  
              duration_in_seconds = duration_string_to_seconds(duration_string)
  
  
  
              # Make start_stop_list
  
              start_stop_list = read_start_stop_list(start_stop_lists[nbr_video])
  
              nbr_video += 1
  
              total_pieces = int(len(start_stop_list))

  This is the line causing the problem :

  ffprobe_process = subprocess.run(args=["ffprobe", "-i", video_file, "-hide_banner"],
  
                                             check=True,
  
                                             stdout=subprocess.PIPE,
  
                                             stderr=subprocess.PIPE,
  
                                             encoding="utf-8",
  
                                             shell=True)

  When I change it to this line of code :

  ffprobe_process = subprocess.run(args=['ffprobe', '-i', video_file, '-show_entries', 'format=duration', '-v', 'quiet', '-of', 'csv=%s' % ("p=0")])

  it works, I mean, the script goes after that line, but then throws the following error at the next line :

  470.240000
  
  expected string or bytes-like object

  470.240000 is the right duration of my video. So the new line that I changed it with works better, but still not working with my code somehow.

  Anyone has an idea how I can solve this ?

• FFMPEG Mpeg-DASH what attributes options and flags do we need to make H264 playable .mpd universally playable

  22 mars 2021, par Jintor

  I want to encode from any source to a universally playable .mpd with h264 codec.

  


  Here my command

  


  /usr/bin/ffmpeg -re -i 1.webm -c:v libx264 -preset ultrafast 
-tune zerolatency -c:a aac -ac 2 -strict -2 -crf 18 -profile:v baseline 
-maxrate 1000k -pix_fmt yuv420p -flags -global_header -streaming 1 
-use_template 1 -use_timeline 0 -seg_duration 2 -remove_at_exit 1 
-f dash index.mpd


  


  but with dash.js the log says

  


  dash.js videoCodec (video/mp4;codecs="avc1") is not supported.


  


  **EXTRA NOTE : When using -c:v libx264 and output in HLS .m3u8 —> it's working in all browsers

  


  HTML with dash.js

  


  <code class="echappe-js">&lt;script src=&quot;http://cdn.dashjs.org/latest/dash.all.min.js&quot;&gt;&lt;/script&gt;&#xA;    
  &#xA;    &lt;script&gt;&amp;#xA;    (function(){&amp;#xA;        var url = &quot;https://www.---domain--path-to.mpd&quot;;&amp;#xA;        var player = dashjs.MediaPlayer().create();&amp;#xA;        player.initialize(document.querySelector(&quot;#videoPlayer&quot;), url, true);&amp;#xA;player.updateSettings({&amp;#xA;            streaming: {&amp;#xA;                 lowLatencyEnabled: true, &amp;#xA;                 liveDelay: 4,&amp;#xA;                 liveCatchup: {&amp;#xA;                    minDrift: 0.02,&amp;#xA;                    maxDrift: 0,&amp;#xA;                    playbackRate: 0.5,&amp;#xA;                    latencyThreshold: 60    &amp;#xA;                  }&amp;#xA;            }&amp;#xA;        });&amp;#xA;    })();     &amp;#xA;    video = document.getElementById(&quot;videoPlayer&quot;);&amp;#xA;    video.addEventListener(&quot;loadedmetadata&quot;, function(){ video.muted = true; video.play(); }, false);&amp;#xA;    &lt;/script&gt;&#xA;
  

  


  I do have "-c:v libx264" but why dash.js sees avc1... I know that h264 have avc1, but how to fix this. Is it fixing the ffmpeg command or changing the player.initialize in the javascript

  


• How to get success info from ffmpeg on C# ?

  13 mars 2014, par user2989391

  I using ffmpeg on C#, my argument worked fine but i don't know get success handle..
  Sorry for my bad English.
  Thank you for help.

      ProcessStartInfo psi = new ProcessStartInfo("bin\\ffmpeg.exe");
  
      Process proc = Process.Start(psi);
  
      psi.UseShellExecute = false;
  
      psi.CreateNoWindow = true;
  
      psi.Arguments = " My argument ";
  
      psi.RedirectStandardError = true;
  
      psi.WindowStyle = ProcessWindowStyle.Hidden;
  
      proc = Process.Start(psi);
  
      StringBuilder sb = new StringBuilder();
  
      StreamReader outputReader = proc.StandardOutput;
  
      while (!(proc.StandardOutput.EndOfStream)) {
  
          sb.AppendLine(proc.StandardOutput.ReadLine());
  
      }
  
      proc.WaitForExit();
  
      proc.Close();
  
      psi = null;