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• ffmpeg works with laptop webcam but not with android camera

  28 février 2023, par Rajkumar Somasundaram

  I am working on Macbook with M1 Chip with this ffmpeg version locally installed.

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers 
built with Apple clang version 14.0.0 (clang-1400.0.29.202)


  


  With this, I am able to use my laptop's webcam as input and do my ffmpeg work.

  


  Following command is what worked (avfoundation was needed for OSX)

  


  ffmpeg -f avfoundation -framerate 30 -i 0:0 \
-map 0:v:0 -map 0:a:0 \
-pix_fmt yuv420p \
-c:v libx264 -profile:v high \
-crf 32 -ar 44100 \
-c:a aac \
-filter:v:0 scale=w=480:h=360 \
-utc_timing_url "https://time.akamai.com/?iso" \
-segment_time 8 \
-f dash ${path.join(__dirname, "/output/sample.mpd")}


  


  Now, I am trying to use my android front camera as an input.

  


  But, it is not working. (Errors are mainly in & around camera_index)

  


  I am trying the following command and facing error.

  


  ffmpeg -f android_camera -camera_index 0 -framerate 30 -map 0:v -map 0:a -c:v\
libx264 -profile:v high -c:a aac -filter:v:0 scale=w=480:h=360 \
-utc_timing_url "https://time.akamai.com/?iso" -segment_time 8 \
-f dash ${path.join(__dirname, "/output/sample.mpd")}


  


  This is the stacktrace of the whole error log : https://www.diffchecker.com/Mnnghg7M/

  


  

  1. What is the correct command for android camera as input ?

  


  2. Do all stable versions of ffmpeg work with android or any limitations ?

  


  


• 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 ?

  


• Java - Runtime.exec() freezes on execution of ffmpeg Audio-replacing command that works in windows console

  25 mars 2023, par Finn Andre Worm

  I have been building an application to merge together videos based on data I got from the web. I was lucky enough to find this great tool ffmpeg that has saved me a lot of time and effort, but unfortunately I seem to be stuck on the following issue :

  


  Im attempting to execute a command for merging a video with audio (in the future I will also be adding hardcoded .ASS subtitles and .PNG images).
My application dynamically generates me a command based on the files its suppposed to use which works just as intended, as the command that I get works inside of my windows console (cmd).
But when I try to run it through my Java application, the code seems to "freeze" permanently and while the placeholder file gets created on my desktop with the filename and correct file format, it just has the default windows video icon and cant be opened (as it has not finished being created, duh).
Im also using Eclipse, perhaps thats worth noting.

  


  This is the part of the code where it freezes :

  


  protected void runFFMPEG(Multimap args, String outputFile, String fileFormat) throws IOException
{
    try
    {
        Runtime.getRuntime().exec(setCommand(args, outputFile, fileFormat)).waitFor();
    }
    catch (InterruptedException e)
    {
        e.printStackTrace();
    }
}


  


  as previously said, the command itself is generated correctly, but heres the code nonetheless :

  


  private String[] setCommand(Multimap args, String outputFile, String fileFormat)
{
    String[] command = new String[args.size()*2+2];
    command[0] = ffmpegLocation;
    int[] i = new int[1];
    i[0] = 1;
    args.forEach((key, value) -> { 
        command[i[0]++] = key;
        command[i[0]++] = value;
    });
    command[i[0]] = outputFile + fileFormat;
    return command;
}


  


  Note : I used a normal string previously for command, but I saw another thread saying that using an array instead fixxed their issue (which it didnt for me, else i wouldnt be here...).

  


  This is an example command that gets generated :

  


  ffmpeg.exe -ss 00:00:00 -to 00:00:15 -i C :\Users\Test.mp4 -i C :\Users\FINAL.mp3 -map 0 -map 1:a -c:v copy C :/Users/User/TestVideo.mp4

  


  I also have a different command that concats the audio together into one FINAL.mp3 file, so its not like ffmpeg entirely fails to work in my application.
My guess is that it has something to do with the Runtime i get with Runtime.getRunTime(), but I cant seem to find out what the problem is.
Can someone tell me what I did wrong ? Thanks in advance !