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• How do I ffmpeg to iterate through 10,000+ datetime stamped files

  18 décembre 2018, par Rich

  I have a large number of jpgs captured from a cctv camera which I mistakenly used a dashed date time stamp in my curl command. The file names are

   Underwater-Cam-2017-10-20_17-58-22.jpg

  If I do a wildcard I get

  bash: /Applications/ffmpeg: Argument list too long

  I understand from other posts that I don’t want avoid the pattern being expanded using a glob, but I’m not sure how to iterate through these files with multiple sequential numbers. I tried this consecutive integer counting sequence which is in retrospect obviously not going to work, but I lack enough knowledge to resolve this through searching.

  /Applications/ffmpeg -y -i '/path/to/src/2017-10-20/Underwater-Cam-2017-10-20_%02d-%02d-%02d.jpg' -r 24 -vf "scale=hd720" -metadata:s:v rotate=0 -vcodec libx265 -preset veryfast -crf 24 -an -movflags +faststart /path/to/dest/uwcam-2017-10-20.mp4

  I’m doing this on a mac using bash 4.

• Piping images to FFmpeg stdin

  21 décembre 2018, par Vincent Bavaro

  Good morning, I need to stream trough hls many images that come in a folder as if they were video frames. I don’t know prior how many they are so I believe I need to keep FFmpeg opened and passing them via stdin. I read this article already
  create video from growing image sequence
  and I changed the c# code to fit my problem like this :

  using System;
  
  using System.IO;
  
  using System.Threading;
  
  using System.Threading.Tasks;
  
  using System.Diagnostics;
  
  using System.ComponentModel;
  
  namespace Example
  
  {
  
  public class Example
  
  {
  
  
  
  static void Main()
  
  {
  
  
  
      AsyncMain().GetAwaiter().GetResult();
  
  }
  
  
  
  static async Task AsyncMain()
  
  {
  
      Console.WriteLine("Press any button to quit.");
  
      var maintask = RunFFMPEG();
  
      var readtask = Task.Run(() => Console.Read());
  
      await Task.WhenAny(maintask, readtask);
  
  }
  
  
  
  
  
  
  
  static async Task RunFFMPEG()
  
  {
  
      await Task.Run(() =>
  
      {
  
          const int fps = 30;
  
          const string outfile = "video_seg_%05d.ts";
  
          const string dir = @"C:\Users\funny\Desktop\in\";
  
          const string pattern = "{0}.bmp";
  
          const string path = dir + pattern;
  
          const string args = "-y -re -f image2pipe -framerate 2 -i - -c:v libx264 -r {0} -s 1920x1200 -b:v 256000 -flags +global_header -map 0 -f segment -segment_time 10 -segment_list_size 0 -segment_list list.m3u8 -segment_format mpegts {1}";
  
          const int startNum = 0;
  
          const int endNum = 100;
  
  
  
     var pinf = new ProcessStartInfo("ffmpeg", string.Format(args, fps, outfile));
  
          pinf.UseShellExecute = false;
  
          pinf.RedirectStandardInput = true;
  
          pinf.WorkingDirectory = dir;         
  
  
  
          Console.WriteLine("Starting ffmpeg...");
  
          var proc = Process.Start(pinf);
  
          using (var stream = new BinaryWriter(proc.StandardInput.BaseStream))
  
          {
  
              for (var i = startNum; i < endNum; i++)
  
              {
  
                 var file = string.Format(path, i.ToString("D4"));
  
                  System.Threading.SpinWait.SpinUntil(() => File.Exists(file) && CanReadFile(file));
  
                  Console.WriteLine("Found file: " + file);
  
                  stream.Write(File.ReadAllBytes(file));
  
              }
  
          }
  
  
  
   proc.WaitForExit();
  
          Console.WriteLine("Closed ffmpeg.");
  
      });
  
  }
  
  
  
  
  
      static bool CanReadFile(string file)
  
      {
  
          //Needs to be able to read file
  
          FileStream fs = null;
  
          try
  
          {
  
              fs = File.OpenRead(file);
  
              return true;
  
          }
  
          catch (IOException)
  
          {
  
              return false;
  
          }
  
          finally
  
          {
  
              if (fs != null)
  
                  fs.Close();
  
          }
  
      }
  
  
  
  
  
  }
  
  }

  When I run the script, I get the following screen :

  Press any button to quit.
  
  Starting ffmpeg...
  
  ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20181017
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100

  And it stays like this even though I have images in my folder and they keep coming. Anyone can tell me why isn’t it processing ? (I’ve tried to run the FFmpeg command alone on a fixed number of images without piping and it works.)

• Anomalie #4230 (Nouveau) : Limite à la longueur des paramètres d’un modèle

  17 novembre 2018

  Bonjour,

  C’est pas exactement Texwheel parce que le code concerné est dans le core. Mais ça se manifeste dans le traitement des raccourcis typo.
  Bref.

  J’ai constaté que si un modèle contenait trop de caractères, alors qu’il passait en PHP 5.6, il n’était plus interprété en PHP 7.

  Test ici : https://contrib.spip.net/ecrire/?exec=article&id_article=5055

  Et preuve du problème : https://3v4l.org/lqqIG qui montre qu’en PHP 5.6, la regex fonctionne, mais pas pour 7.0.32 - 7.3.0alpha2 (alors qu’avec un caractère de moins, ça passe partout : https://3v4l.org/k4bgd)
  Code construit à partir de https://core.spip.net/projects/spip/repository/entry/branches/spip-3.2/ecrire/inc/lien.php#L294

  Il semblerait que ce soit une limite de PCRE introduite avec PHP7 et son option jit activée par défaut :https://stackoverflow.com/questions/34849485/regex-not-working-for-long-pattern-pcres-jit-compiler-stack-limit-php7

  En local, je n’ai plus le problème en ayant mis dans mes_options.php :
  ini_set(’pcre.jit’, 0) ;

  https://regex101.com/r/DqmJMs/2 permet de voir que la regex fait énormément de backtrack et donc d’étapes : 19105 étapes.

  J’ai idée que l’usage de conditions serait plus efficace, mais j’ai pas trouvé comment.
  https://www.rexegg.com/regex-conditionals.html#engines