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• What the correct args for ffmpeg conversion

  8 novembre 2013, par Andrew Simpson

  I have a C# app. I am using ffmpge to convert jpgs to an OGG file. I use the process class to write to a stream buffer within my app using piping without having to write the ogg file to a disk. I then upload these bytes to my server where it is written to the hard drive.

  On the server side I want to convert it to say an mp4 format. Again, I want to pipe it out to a stream buffer and allow my User to download the file.

  This is my code :

  Process _serverBuild = null ;

  public byte[] EncodeAndUploadImages(string _args1)
  
  {
  
      byte[] _data = null;
  
      try
  
      {
  
          _args1 = "ffmpeg.exe -i \"c:\\Cloud\\Zipped\\000EC902F17F\\f3e45e44-b61c-472b-8dc1-a8e9b9511497_00007.ogg\" avi -";
  
          _serverBuild = new Process();
  
  
  
          _serverBuild.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
  
          _serverBuild.StartInfo.Arguments = _args1;
  
          _serverBuild.StartInfo.FileName =  @"C:\inetpub\wwwroot\bin\ffmpeg.exe";
  
          _serverBuild.StartInfo.UseShellExecute = false;
  
          _serverBuild.StartInfo.RedirectStandardOutput = true;
  
          _serverBuild.StartInfo.RedirectStandardError = true;
  
          _serverBuild.StartInfo.RedirectStandardInput = true;
  
          _serverBuild.StartInfo.CreateNoWindow = true;
  
          _serverBuild.StartInfo.LoadUserProfile = false;
  
          _serverBuild.ErrorDataReceived += _server_ErrorDataReceived;
  
          _serverBuild.OutputDataReceived += _server_OutputDataReceived;
  
          _serverBuild.Exited += new EventHandler(_server_Exited);
  
          _serverBuild.EnableRaisingEvents = true;
  
          _serverProcessHasFinished = false;
  
          _serverBuild.Start();
  
  
  
          mStandardOutput = _serverBuild.StandardOutput.BaseStream;
  
          mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);            
  
          _serverBuild.WaitForExit();
  
  
  
  
  
  
  
  
  
      }
  
      catch (Exception _ex)
  
      {
  
  
  
      }
  
      finally
  
      {
  
          _serverBuild.ErrorDataReceived -= _server_ErrorDataReceived;
  
          _serverBuild.OutputDataReceived -= _server_OutputDataReceived;
  
          _serverBuild.Dispose();
  
      }
  
      return _data;
  
  }
  
  
  
  byte[] mReadBuffer = new byte[4096];
  
  MemoryStream mStandardOutputMs = new MemoryStream();
  
  Stream mStandardOutput;
  
  
  
  private void StandardOutputReadCallback(IAsyncResult ar)
  
  {
  
      try
  
      {
  
          int numberOfBytesRead = mStandardOutput.EndRead(ar);
  
          {
  
              mStandardOutputMs.Write(mReadBuffer, 0, numberOfBytesRead);
  
              mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
          }
  
      }
  
      catch (Exception _ex)
  
      {
  
  
  
      }
  
  }

  The error I get (when I test with a bat file and run within a DOS prompt) is :

  

  Obviously my parameters are at fault. I want to keep it simple as I may want to use other formats apart from MP4.

  Thanks

• Can't preserve metadata in ffmpeg video conversion

  30 avril 2017, par sakovias

  I would like to preserve the creation time metadata when I convert videos using ffmpeg/avconv. Here is the file I’m trying to convert :

  $ ffmpeg -i in.avi 
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  
  Input #0, avi, from 'in.avi':
  
    Metadata:
  
      creation_time   : 2013-08-12 06:59:14
  
      encoder         : CanonMVI06
  
    Duration: 00:00:12.26, start: 0.000000, bitrate: 14549 kb/s
  
      Stream #0.0: Video: mjpeg, yuvj422p, 640x480, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0.1: Audio: pcm_u8, 11024 Hz, 1 channels, u8, 88 kb/s

  In the first approach I run

  $ ffmpeg -i in.avi -vcodec libx264 -acodec libmp3lame -r 30 -map_metadata 0 out.avi

  and get an output file which doesn’t have the ’creation_date’ metadata that I’d like to keep :

  $ ffmpeg -i out.avi 
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  
  [avi @ 0x83ba260] max_analyze_duration reached
  
  Input #0, avi, from 'out.avi':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
    Duration: 00:00:12.38, start: 0.000000, bitrate: 704 kb/s
  
      Stream #0.0: Video: h264 (Main), yuv420p, 640x480, 30 fps, 30 tbr, 30 tbn, 60 tbc
  
      Stream #0.1: Audio: mp3, 11025 Hz, mono, s16, 200 kb/s

  I also tried another approach

  $ ffmpeg -i in.avi -f ffmetadata metadata.txt
  
  $ ffmpeg -i in.avi -f ffmetadata -i metadata.txt -vcodec libx264 -acodec libmp3lame -r 30 out.avi

  with the same success even though metadata.txt has the right info :

  ;FFMETADATA1
  
  creation_time=2013-08-12 06:59:14
  
  encoder=CanonMVI06

  What am I doing wrong ?

• Video conversion on different server than app server

  13 mars 2016, par yakuzafu

  I’ve got my application running on server A.

  When a user uploads a video via that application, the video should be transferred via FTP to another server B. I don’t know how to make something like this work :

  • User uploads a video (like .avi, .webm, .mkv)
  • Application puts it on the FTP server
  • FTP server converts that video to .mp4

  I’ve tried using FFmpeg on PHP, but it executes only on the server where the application is located, but I need it to run on the FTP server.

  How can I make it work like that ?