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• Looping back and forth through frames with ffmpeg

  18 mai 2017, par sebb

  I have a set of ten PNG frames that I’d like to convert to a "boomerang style" mp4 file (i.e go from frame 1 to frame 10, then from 9 to 2). I’d like to find something similar to ImageMagick’s patrol cycle, but can’t figure out how to to it with ffmpeg.

  I thought it would be possible to do this using concat but :

  • I think it’s dirty
  • My command simply does not work :)

  Here’s my command so far :

  -framerate 5 -i "concat:01.png|02.png|03.png|04.png|05.png|06.png|07.png|08.png|09.png|10.png|09.png|08.png|07.png|06.png|05.png|04.png|03.png|02.png" -pix_fmt yuv420p output.mp4

  I get a video file but it just goes from 1 to 10 once.

  Here’s ffmpeg’s saying hello :

  ffmpeg version N-86098-g3fefaea Copyright (c) 2000-2017 the FFmpeg developers
  
  
  
    built with gcc 6.3.0 (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. 63.100 / 55. 63.100
  
  
  
    libavcodec     57. 96.101 / 57. 96.101
  
  
  
    libavformat    57. 72.101 / 57. 72.101
  
  
  
    libavdevice    57.  7.100 / 57.  7.100
  
  
  
    libavfilter     6. 89.101 /  6. 89.101
  
  
  
    libswscale      4.  7.101 /  4.  7.101
  
  
  
    libswresample   2.  8.100 /  2.  8.100
  
  
  
    libpostproc    54.  6.100 / 54.  6.100

  Anyone has an idea ?

  Thanks !

• C# FFmpeg Cannot process request because the process (11536) has exited

  30 avril 2016, par Martin Mazza Dawson

  I’m trying to convert an .ogg file to .mp3. I am following this link to do so : How to call ffmpeg.exe to convert audio files on Windows Azure ?

  I get the error message :

  Cannot process request because the process (11536) has exited.

  The ffmpeg.exe is in my root dir and it works when I convert the .ogg file to .mp3 in the command prompt, the ogg_path also has the correct bytes written to it when I check using debugging.
  Can anyone tell me what I am doing wrong please ?

      [HttpPost]
  
      public void ConvertFileToMp3(HttpPostedFileBase file)
  
      {
  
          string ogg_path = Server.MapPath("~/0477.ogg");
  
          string mp3_path = Server.MapPath("~/0477.mp3");
  
  
  
          using (var reader = new BinaryReader(file.InputStream))
  
          {
  
              System.IO.File.WriteAllBytes(ogg_path, reader.ReadBytes(file.ContentLength));
  
          }
  
  
  
          ProcessStartInfo psi = new ProcessStartInfo();
  
          psi.FileName = Server.MapPath("~/ffmpeg.exe");
  
          psi.Arguments = string.Format(@"-i ""{0}"" -y ""{1}""", ogg_path, mp3_path);
  
          psi.CreateNoWindow = true;
  
          psi.ErrorDialog = false;
  
          psi.UseShellExecute = false;
  
          psi.WindowStyle = ProcessWindowStyle.Hidden;
  
          psi.RedirectStandardOutput = true;
  
          psi.RedirectStandardInput = false;
  
          psi.RedirectStandardError = true;
  
          Process exeProcess = Process.Start(psi);
  
  
  
          try
  
          {
  
              exeProcess.PriorityClass = ProcessPriorityClass.High; //Fails here
  
              string outString = string.Empty;
  
              exeProcess.OutputDataReceived += (s, e) => {
  
                  outString += e.Data;
  
              };
  
              exeProcess.BeginOutputReadLine();
  
              string errString = exeProcess.StandardError.ReadToEnd();
  
              Trace.WriteLine(outString);
  
              Trace.TraceError(errString);
  
              exeProcess.WaitForExit();
  
          }
  
          catch (Exception e)
  
          {
  
              Trace.TraceError(e.Message);
  
          }
  
  
  
          //do other stuff with file, cut for brevity
  
      }

• Generate a gif preview for a video file in-memory [on hold]

  25 avril 2016, par yeska

  I need to generate previews for video files sent by the user. I have found several questions about this but all the given solutions ( mostly using ffmpeg ) output the preview in a temp file. I have a memorystream ( a file read from azure storage ) and I need to generate a preview without touching the file system ( it’s a requirement for our project ), the preview can be for example a stream or a bit array.

  If there is a solution to get frames from a video, it’s suffisant too, I can manage to generate the gif from the frames.

  Is there any library which can be used to do this ?