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• C# FFMPEG - How to get extracted frames without save in file system

  4 janvier 2023, par kadam

  I need to process frames from video and live stream without saving into file system.

  


  C# I am trying using below code, but not getting frames

  


  Process proc = new Process();
            proc.StartInfo.FileName = @"E:\ffmpeg\bin\ffmpeg.exe";
            proc.StartInfo.Arguments = String.Format(@"-i E:\ffmpeg\bin\video.mp4 -f rawvideo pipe:1");
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.Start();
proc.OutputDataReceived += (sender, args) => DataReceived(args);
            proc.ErrorDataReceived += (sender, args) => DataReceived(args);


  


  I can get frames in nodejs successfully using below code

  


  
const spawnProcess = require('child_process').spawn
    ffmpeg = spawnProcess('E:\\ffmpeg\\bin\\ffmpeg.exe', [
      '-i', 'rtsp://username:password@192.168.6.37/ch1/main/sub-stream',
      '-vcodec', 'mjpeg','-vf','fps=2',
      '-f', 'rawvideo',
      //'-s', HW, // size of one frame
      'pipe:1'
  ]);
      ffmpeg.stderr.pipe(logStream);
      let frames = [];
      ffmpeg.stdout.pipe(new ExtractFrames("FFD8FF")).on('data', (data) => {
        var fName=new Date().getTime()+".png";
        (
          async () => await ProcessFrame(Buffer.from(data).toString('base64'))
        )();
      })


  


  Same thing await ProcessFrame(Buffer.from(data).toString('base64')) I want in C#

  


• The system cannot find the file specified error when trying to execute FFMpeg command with C# (same code works fine in a different app)

  5 mars 2023, par m_kr

  I know there are similar questions to this one. I have gone through every single one I could find and nothing worked for me. Here is my issue :

  


  I am trying to execute a FFMpeg command in command-line through .NET.

  


  Before anything I tried doing it with the following code :

  


  public static string executeCommand(string commandToBeExecuted)
    {
        Process cmd = new Process();
        cmd.StartInfo.FileName = "cmd.exe";
        cmd.StartInfo.RedirectStandardInput = true;
        cmd.StartInfo.RedirectStandardOutput = true;
        cmd.StartInfo.CreateNoWindow = true;
        cmd.StartInfo.UseShellExecute = false;
        cmd.Start();

        cmd.StandardInput.WriteLine(commandToBeExecuted);
        cmd.StandardInput.Flush();
        cmd.StandardInput.Close();
        cmd.WaitForExit();
        return cmd.StandardOutput.ReadToEnd();
    }


  


  Sending the "ffmpeg -h" command in commandToBeExecuted. This did not work.

  


  I next tried the following solution :

  


  public static string ffmpegCommand(string commandToBeExecuted)
    {
        ProcessStartInfo startInfo = new ProcessStartInfo();
        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";
        startInfo.WindowStyle = ProcessWindowStyle.Hidden;
        startInfo.Arguments = "-h";

        startInfo.RedirectStandardOutput = true;
        startInfo.RedirectStandardError = true;


        Process exeProcess = Process.Start(startInfo);

        // string error = exeProcess.StandardError.ReadToEnd();
        string output = exeProcess.StandardOutput.ReadToEnd();
        exeProcess.WaitForExit();
        return output;
    }


  


  This returns the following error :

  


  


  The system cannot find the file specified

  


  


  I am assuming this is referring to this part of the code :

  


  startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";


  


  However, I checked and this is the correct path to my ffmpeg.exe file. On an even weirder note, this code works correct when tested in a new .net console application. However, I am creating an extension for OutSystems in integration, and when testing this code there it no longer works. The long exception from the logs is the following :

  


  


  CssbobffmpegCommandTestFolder
System.ComponentModel.Win32Exception : The system cannot find the file specified
at Object.s [as getException] (https://personal-jwy0bfog.outsystemscloud.com/FFMpegCommandGeneratorFFProbeVisual/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:2:10241)
at c.onSuccess (https://personal-jwy0bfog.outsystemscloud.com/FFMpegCommandGeneratorFFProbeVisual/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:3:7232)
at XMLHttpRequest. (https://personal-jwy0bfog.outsystemscloud.com/FFMpegCommandGeneratorFFProbeVisual/scripts/OutSystems.js?RnlDcii3Xz75iIHHERIZtA:3:2648)

  


  


  I researched similar problems and tried the following solutions :

  


  In place of :

  


  startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";


  


  I tried :

  


    startInfo.WorkingDirectory = "c:\\ffmpeg\\bin";
  startInfo.FileName = @"ffmpeg.exe";


  


  I also tried changing the :

  


  startInfo.Arguments = "-h";


  


  to :

  


  startInfo.Arguments = "/C -h";


  


  I tried to "add new item" to my solution : the ffmpeg.exe file, and I tried the following logic :

  


  public static string testingNewApproachTwoThree(string commandToBeExecuted)
    {
        string res;
        ProcessStartInfo startInfo = new ProcessStartInfo();

        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ffmpeg\\ffmpeg.exe");
        startInfo.Arguments = "-h";
        startInfo.RedirectStandardOutput = true;
        //startInfo.RedirectStandardError = true;

        res = string.Format(
            "Executing \"{0}\" with arguments \"{1}\".\r\n",
            startInfo.FileName,
            startInfo.Arguments) + " NEXT: ";

        try
        {
            using (Process process = Process.Start(startInfo))
            {
                while (!process.StandardOutput.EndOfStream)
                {
                    res = res + process.StandardOutput.ReadLine();

                }

                process.WaitForExit();
            }
        }
        catch (Exception ex)
        {
            res = res + "exception:" + ex.Message;
        }

        return res;
    }


  


  as suggested in a different question.

  


  I tried changing the capitalization of letters in the specified filepath to make sure it matches the naming of my folders. Nothing worked.

  


  Any ideas ?

  


• nodejs fluent-ffmpeg split long file into multiple small files based on seconds given

  9 mars 2023, par Mahesh Dama

  I want to split 10 minute audio mp3 file to 10 different 1 minute files using fluent-ffmpeg package in nodejs.
We can do this for ffmpeg package using the following command

  


  ffmpeg -i file.wav -f segment -segment_time 60 -c copy parts/output%09d.wav


  


  But I want the same functionality in fluent-ffmpeg for nodejs. What is the name of the method ?

  


  return ffmpeg(audioFile)
    .toFormat('wav')
    .audioChannels(1)
    .audioFrequency(44100)
    .audioBitrate('128')
    .on('error', (err) => {
        //error
    })
    .on('progress', (progress) => {
        //progress
    })
    .on('end', () => {
      // on complete
    })


  


  I tried looking at documentation for the segment feature for fluent-ffmpeg but couldn't get any solution.