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• 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 ?

  


• Adding FFMPEG support to Chromium Portable on Windows without recompiling

  13 décembre 2023, par Ashby

  I am using Chromium portable on Windows recently.

  


  I downloaded Chromium portable from chromium.org, finding it without FFMPEG support, which means playing media just not possible for some websites.

  


  Is there a simple or a little complex hack or plugin or patches to make FFMPEG on Chromium portable from chromium.org work ? Thanks.

  


  Due to personal reasons I am not intended to use Google Chrome for some months, due to its automatic updates something like Windows Update, making me annoyed.

  


  On Linux, I know there is a package called chromium-codecs-ffmpeg-extra, which makes FFMPEG support possible. But I do NOT find something similar on Windows.

  


  Recompiling Chromium costs hours and I just do not want to use some third-party Chromium releases due to security requests.

  


  Years have gone and past questions years ago on stackflow just not cater my need today.

  


  Thanks for your patience & understanding.

  


• poll always return 0 on ff_poll_interrupt on avformat_open_input, while playing a rtsp authentication url [closed]

  12 mars 2024, par CodeEater

  I tried to play a rtsp authentication url on my personal player. The rtsp url format is rtsp ://user:pass@x.x.x.x/VideoString. VLC player can play this url but mine is not ok.

  


  Specifically, on function bellow, ret always return 0 and the whole thread stuck at the loop.

  


  static int ff_poll_interrupt(struct pollfd *p, nfds_t nfds, int timeout, AVIOInterruptCB *cb)
{
    int runs = timeout / POLLING_TIME;
    int ret = 0;

    do {
        if (ff_check_interrupt(cb))
            return AVERROR_EXIT;
        ret = poll(p, nfds, POLLING_TIME);
        if (ret != 0) {
            if (ret < 0) {
                ff_log_net_error(NULL, AV_LOG_ERROR, "ff_poll_interrupt");
                ret = ff_neterrno();
            }
            if (ret == AVERROR(EINTR))
                 continue;
            break;
        }
    } while (timeout <= 0 || runs-- > 0);

    if (!ret) {
        av_log(NULL, AV_LOG_ERROR, "Error in ff_pool_interrupt, timeout = %d.\n", timeout);
        return AVERROR(ETIMEDOUT);
    }
    return ret;
}


  


  Codes bellow are what I modified try to fix it . And now it will return "timeout" because "runs" works on ff_poll_interrupt.

  


  ...
av_dict_set(&mInputOpts, "buffer_size", "1024000", 0);
av_dict_set(&mInputOpts, "rtsp_transport", "tcp", 0);
av_dict_set(&mInputOpts,"stimeout","20*1000*1000",0);


int ret = avformat_open_input(&mCtx, filename, in_fmt, mInputOpts ? &mInputOpts : nullptr);
...


  


  wireshack shows that only 3 messages occur during the whole process(filtered by specific ip), which occurs on "start_connect_attempt" called by ff_connect_parallel.

  


  wireshack messages

  


  order is :

  


  

  1. C to S

  


  2. S to C

  


  3. C to S

  


  


  expected : 4.C to S(with options or describe)

  


  if poll return normal, then 4.C to S(with options or describe) will execute on ff_rtsp_connect.

  


  So my question is Why poll always return 0 on ff_poll_interrupt on avformat_open_input, while playing a rtsp authentication url ?