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• FFMPEG rgb image from named pipe in to h256 rawvideo out to named pipe out

  12 octobre 2018, par Evren Bingøl

  I am forking an ffmpeg and piping in rgb0 images and read hvec rawvideo (h256 frames) out.

  This is the command I am using

  ffmpeg -y -video_size 176x144 -f rawvideo -pix_fmt rgb0 -i 
  
  \\\\.\\pipe\\my_pipe  -c:v libx265   -f rawvideo  \\\\.\\pipe\\my_pipe_out

  The issue is I never hear anything in ffmpeg when I try to read the pipe, so ffmpeg is not spitting anything out.

  When piping data into ffmpeg, I would assume that ffmpeg knows by the format parameter that it is rgb, and by the dimensions parameter, its size and calculates when a certain amount of data it received from pipe in is a full frame rgb image, processes it, and spits back hvec from pipe out.

  But it blocks as if it is accepting more data even though a full rgb image is piped in.

  Is what I am trying to do doable ?

• Proper way to pipe raw video to ffmpeg in c#

  11 octobre 2018, par Wahid Masud

  In my Asp.NET MVC app I’m trying to pipe the video from Request.Files[] to the ffmpeg.exe process. The code produces an output file, but I’m getting a static video, no contents there. And I’m not sure if the problem is in the arguments or in the code.

  var request = System.Web.HttpContext.Current.Request;
  
  var stream = request.Files["upload"].InputStream;
  
  var ffmpeg = System.Web.HttpContext.Current.Server.MapPath("~/FFMpeg/ffmpeg.exe");
  
  var outputDir = System.Web.HttpContext.Current.Server.MapPath("~/Uploads/converted.mp4");
  
  
  
  var inputArgs = "-f rawvideo -pix_fmt rgb32 -video_size 1280x720 -i -";
  
  var outputArgs = "-vcodec libx264 -crf 23 -pix_fmt rgb32 -preset ultrafast " + outputDir;
  
  
  
  var process = new Process
  
  {
  
      StartInfo =
  
      {
  
          FileName = ffmpeg,
  
          Arguments = $"{inputArgs} {outputArgs}",
  
          UseShellExecute = false,
  
          CreateNoWindow = true,
  
          RedirectStandardInput = true
  
      }
  
  };
  
  
  
  process.Start();
  
  
  
  var ffmpegIn = process.StandardInput.BaseStream;
  
  
  
  // Write Data
  
  byte[] buffer = new byte[stream.Length];
  
  stream.Read(buffer, 0, (int)stream.Length);
  
  ffmpegIn.Write(buffer, 0, (int)stream.Length);
  
  
  
  ffmpegIn.Flush();
  
  ffmpegIn.Close();  

  The video size is always 1280x720 but framerate may vary, so I’m not sure if the inputArgs is right. Any suggestions would be appreciated.

• ffmpeg mp3 encoding result differs between pipe and file creation

  11 octobre 2018, par Jinsung Lee

  I’m making the program by using ffmpeg but stuck in some problem

  Encode to mp3 and file out

  ffmpeg -nostats -loglevel 0 -i example.weba -i albumart.jpg -map 0:0 -map 1:0 -id3v2_version 3 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" out.mp3

  this works very good but

  Encode to mp3 and pipe out

  ffmpeg -nostats -loglevel 0 -i example.weba -i albumart.jpg -map 0:0 -map 1:0 -id3v2_version 3 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -f MP3 - > out.mp3

  using pipe output i got

  ffmpeg -i out.mp3
  
  [mp3 @ 0000000001028980] Header missing

  This error

  I need to get this mp3 data with oneline php shell_exec command

  any solution ?

  Thanks