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• C# Process StandardInput and StandardOutput with FFmpeg freezes

  5 juin 2018, par cmxl

  I’m trying to pipe some stream to ffmpeg and capture it’s output so that I can pass on another stream in my code.
  Here is a code example, that just stops the process from continuing after I write to its StandardInput.BaseStream.

  internal class Program
  
      {
  
          private static void Main(string[] args)
  
          {
  
              var inputFile = @"C:\Temp\test.mp4";
  
              var outputFile = @"C:\Temp\test.mp3";
  
  
  
              var process = new Process
  
              {
  
                  StartInfo = new ProcessStartInfo
  
                  {
  
                      RedirectStandardInput = true,
  
                      RedirectStandardOutput = true,
  
                      RedirectStandardError = true,
  
                      UseShellExecute = false,
  
                      CreateNoWindow = true,
  
                      Arguments = "-i - -f mp3 -",
  
                      FileName = "ffmpeg.exe"
  
                  },
  
                  EnableRaisingEvents = true
  
              };
  
  
  
              process.ErrorDataReceived += (sender, eventArgs) => Console.WriteLine(eventArgs.Data);
  
  
  
              process.Start();
  
              process.BeginErrorReadLine();
  
  
  
              using (var input = new FileStream(inputFile, FileMode.Open))
  
              using (var output = new FileStream(outputFile, FileMode.Create))
  
              {
  
                  input.CopyTo(process.StandardInput.BaseStream);
  
                  process.StandardOutput.BaseStream.CopyTo(output);
  
              }
  
  
  
              process.WaitForExit();
  
  
  
              Console.WriteLine("done");
  
              Console.ReadLine();
  
          }
  
      }

  This example is pretty much the same as in the answer in this question : https://stackoverflow.com/a/8999542/2277280

  What am I doing wrong ?
  Why does the process not continue ?
  Is it ffmpeg specific ?

• Pipe ffmpeg process with node js

  20 juin 2022, par Max

  When I make request to route, spawn process and pipe it directly to response, it works perfectly fine and creates livestream. However, it takes some time to start process and buffer some data to start playing video.

  


  app.get("/stream", async (req, res) => {
  const url = "rtsp://213.3.38.11/axis-media/media.amp";

  const cmd = [
    "-re",
    "-loglevel",
    "debug",
    "-reorder_queue_size",
    "5",
    "-rtsp_transport",
    "tcp",
    "-i",
    `${url}`,
    "-c:v",
    "copy",
    "-c:a",
    "aac",
    "-f",
    "mp4",
    "-movflags",
    "+frag_keyframe+empty_moov+default_base_moof",
    "pipe:1",
  ];

  const child = spawn("ffmpeg", cmd, {
    stdio: ["ignore", "pipe", process.stderr],
  });

  child.stdio[1].pipe(res)l

  res.on("close", () => {
    child.stdio[1].unpipe(res);
  });
});



  


  I would like to create process while starting server so I can pipe it whenever I make request to that route, but when I do so, process is living for a few seconds then stops using cpu. Sometimes it lives, but dies when I make request and try piping it.

  


• Catch if the Java process crashed

  10 mai 2018, par Victor Sheyanov

  I run java process to convert video using ffmpeg.exe.

  Runtime rt = Runtime.getRuntime();
  
  String cmd = FFMPEGFULLPATH + " -y -i " + '"' + mpeg4File + '"' + " -vcodec libx264 -vsync 2 " + '"' + H264file + '"';
  
  
  
  Process pr = rt.exec(cmd);
  
  
  
  ThreadedTranscoderIO errorHandler = new ThreadedTranscoderIO(pr.getErrorStream(), "Error Stream");
  
  errorHandler.start();
  
  ThreadedTranscoderIO inputHandler = new ThreadedTranscoderIO(pr.getInputStream(), "Output Stream");
  
  inputHandler.start();
  
  
  
  try {
  
        pr.waitFor();
  
  } catch (InterruptedException e) {
  
        LiveApplication.logger.info("Some shit happens during convertation 2 ");
  
        throw new IOException("UseTranscoderBlocking - Run_FFMPEG - process interrupted " + e);                  
  
  }

  But when the process started, sometimes especially with big files, but not always i get this windows message :

  

  This happens only on Windows server 2008 and didn’t happened on Windows 7.

  I have 2 questions :

  1. Why this process fails ?
  2. Can I catch this fail in Java, close
     this window and continue thread execution (maybe I’ll restart this
     proccess).