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• SETX is not recognized as an internal or external command operable program or batch file [duplicate]

  6 avril 2020, par anonymous

  (skip this paragraph if you don't care about context) : So I was trying to record inside of Minecraft using the replay mod, and to render a video I have to install this thing called ffmpeg to render it, and my fears were correct, SETX is not recognized.

  



  So, a while back I had to redo my javac because that wasn't recognized, but when I did get that fixed, it made all my other commands toast, except the basic ones like "copy" or "del". I don't know how, I'd assume I'd need to manually input the path variable and everything because I doubt I could even find anything in the system variables for it, but that may not be the case. Suggest some YouTube vids, or a thorough and non-complicated explanation if you can, because for some reason, some instructions go through one ear and out the other.

  



  I also posted this in /r/feedthebeast, but I doubt anyone will find a solution there.

  



  Thanks.

  


• how to send the input data to FFMPEG from a C# program

  18 octobre 2020, par jstuardo

  I need to send a binary stream to FFMPEG so that it sends to an RTMP server.

  


  I did it in a nodejs script using socket.io library and in Linux. It works perfectly.

  


  I need to do the same, but in a Windows Forms application using C#.

  


  This is how I run the ffmpeg.exe application :

  


          _currentProcess = new Process();
        _currentProcess.StartInfo.FileName = _ffmpegExe;
        _currentProcess.StartInfo.Arguments = BuildOptions(framesPerSecond, audioBitRate, audioEncoding, rtmpServer);
        _currentProcess.StartInfo.UseShellExecute = false;
        _currentProcess.StartInfo.CreateNoWindow = true;
        _currentProcess.StartInfo.RedirectStandardInput = true;
        _currentProcess.StartInfo.RedirectStandardError = true;
        _currentProcess.ErrorDataReceived += CurrentProcess_ErrorDataReceived;
        _currentProcess.Start();
        _currentProcess.BeginErrorReadLine();


  


  BuildOptions method is defined this way :

  


      private string BuildOptions(int framesPerSecond, int audioBitRate, string audioEncoding, string rtmpServer)
    {
        string options;
        if (framesPerSecond == 1)
        {
            options = $"-i - -c:v libx264 -preset ultrafast -tune zerolatency -r 1 -g 2 -keyint_min 2 -x264opts keyint=2 -crf 25 -pix_fmt yuv420p -profile:v baseline -level 3 -c:a aac -b:a {audioEncoding} -ar {audioBitRate}-f flv {rtmpServer}";
        }
        else if (framesPerSecond == 15)
        {
            options = $"-i - -c:v libx264 -preset ultrafast -tune zerolatency max_muxing_queue_size 1000 -bufsize 5000 -r 15 -g 30 -keyint_min 30 -x264opts keyint=30 -crf 25 -pix_fmt yuv420p -profile:v baseline -level 3 -c:a aac -b:a {audioEncoding} -ar {audioBitRate} -f flv {rtmpServer}";
        }
        else
        {
            options = $"-i - -c:v libx264 -preset ultrafast -tune zerolatency -c:a aac -ar {audioBitRate} -b:a {audioEncoding} -bufsize 5000 -f flv {rtmpServer}";
        }

        return options;
    }


  


  I am sending the data to the standard input this way :

  


      public void EncodeAndSend(byte[] data)
    {
        if (_currentProcess != null)
        {
            var streamWriter = _currentProcess.StandardInput;
            streamWriter.Write(Encoding.GetEncoding("ISO-8859-1").GetChars(data));
        }
    }


  


  And finally, this method is for receiving the standard error which receives the result from ffmpeg.exe :

  


      private void CurrentProcess_ErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        Console.WriteLine(e.Data);
    }


  


  When I run the application, this is shown in the console :

  


  ffmpeg version 4.3.1-2020-10-01-essentials_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
pipe:: Invalid data found when processing input


  


  If I change the EncodeAndSend method to be :

  


      public void EncodeAndSend(byte[] data)
    {
        if (_currentProcess != null)
        {
            var streamWriter = _currentProcess.StandardInput;
            streamWriter.Write(data);
        }
    }


  


  pipe:: Invalid data found when processing input error is not produced, but no more outputs are shown so it seems it is not working.

  


  What is wrong with this ? how can I send the data to the FFMPEG process ?

  


  Finally, I tell you that the binary stream comes from the camera by mean of MediaRecorder in a web page (the same used for my program in nodejs server, so that it is not the issue here)

  


• Compiling c++ program for ffmpeg, error give undefined reference to [duplicate]

  6 août 2020, par leonardltk1

  I have a code read_mp3.cpp, which uses ffmpeg to decode an mp3 file into an array.

  


  Code for read_mp3.cpp is as follows :

  


      #include &#xA;    #include &#xA;&#xA;    // I use extern "C" as recommended here: https://blog.csdn.net/qq_18144521/article/details/79608355&#xA;    extern "C"&#xA;    {&#xA;    #include <libavutil></libavutil>opt.h>&#xA;    #include <libavcodec></libavcodec>avcodec.h>&#xA;    #include <libavformat></libavformat>avformat.h>&#xA;    #include <libswresample></libswresample>swresample.h>&#xA;    }&#xA;    using namespace std;&#xA;&#xA;&#xA;    int decode_audio_file(const char* path, const int sample_rate, double** data, int* size) {&#xA;        // initialize all muxers, demuxers and protocols for libavformat&#xA;        // (does nothing if called twice during the course of one program execution)&#xA;        av_register_all();&#xA;&#xA;        /*&#xA;        Code for the rest of this function is found here :&#xA;        https://rodic.fr/blog/libavcodec-tutorial-decode-audio-file/&#xA;        */&#xA;&#xA;        return 0;&#xA;    }&#xA;&#xA;    int main (int argc, char ** argv) {&#xA;        // decode data&#xA;        int sample_rate = 44100;&#xA;        double* data;&#xA;        int size;&#xA;        if (decode_audio_file(argv[1], sample_rate, &amp;data, &amp;size) != 0) {&#xA;            return -1;&#xA;        }&#xA;&#xA;        /*&#xA;        Do something with data ...&#xA;        */&#xA;&#xA;        return 0;&#xA;    }&#xA;

  


  I tried different ways to compilations, but to no avail :

  


      g++ -o ./read_mp3.out -Ofast -Wall -Wextra \
      -lavformat-ffmpeg -lavdevice-ffmpeg -lavcodec-ffmpeg -lavutil -lswresample \
    -std=c++11 "./read_mp3.cpp"
    
    g++ -o ./read_mp3.out -Ofast -Wall -Wextra \
      -lavformat -lavdevice -lavcodec -lavutil -lswresample \
    -std=c++11 "./read_mp3.cpp"
    
    g++ -o ./read_mp3.out -Ofast -Wall -Wextra \
      -lavformat  -lavdevice -lavcodec  -lavutil -pthread  -ldl -lswscale -lbz2  -lz -lm \
    -std=c++11 "./read_mp3.cpp"


  


  but i get the following error :

  


      /tmp/ccnZzoIh.o: In function `decode_audio_file(char const*, int, double**, int*)':
    read_mp3.cpp:(.text+0x2781): undefined reference to `av_register_all'
    read_mp3.cpp:(.text+0x2786): undefined reference to `avformat_alloc_context'
    read_mp3.cpp:(.text+0x279c): undefined reference to `avformat_open_input'
    read_mp3.cpp:(.text+0x27b7): undefined reference to `avformat_find_stream_info'
    read_mp3.cpp:(.text+0x284b): undefined reference to `avcodec_find_decoder'
    read_mp3.cpp:(.text+0x2858): undefined reference to `avcodec_open2'
    read_mp3.cpp:(.text+0x2865): undefined reference to `swr_alloc'
    read_mp3.cpp:(.text+0x2880): undefined reference to `av_opt_set_int'
    read_mp3.cpp:(.text+0x2896): undefined reference to `av_opt_set_int'
    read_mp3.cpp:(.text+0x28ae): undefined reference to `av_opt_set_int'
    read_mp3.cpp:(.text+0x28c4): undefined reference to `av_opt_set_int'
    read_mp3.cpp:(.text+0x28dc): undefined reference to `av_opt_set_int'
    
    /tmp/ccnZzoIh.o:read_mp3.cpp:(.text+0x28f0): more undefined references to `av_opt_set_int' follow
    /tmp/ccnZzoIh.o: In function `decode_audio_file(char const*, int, double**, int*)':
    read_mp3.cpp:(.text+0x2907): undefined reference to `av_opt_set_sample_fmt'
    read_mp3.cpp:(.text+0x291d): undefined reference to `av_opt_set_sample_fmt'
    read_mp3.cpp:(.text+0x2927): undefined reference to `swr_init'
    read_mp3.cpp:(.text+0x2931): undefined reference to `swr_is_initialized'
    read_mp3.cpp:(.text+0x2943): undefined reference to `av_init_packet'
    read_mp3.cpp:(.text+0x2948): undefined reference to `av_frame_alloc'
    read_mp3.cpp:(.text+0x297b): undefined reference to `av_read_frame'
    read_mp3.cpp:(.text+0x299a): undefined reference to `avcodec_decode_audio4'
    read_mp3.cpp:(.text+0x29cc): undefined reference to `av_samples_alloc'
    read_mp3.cpp:(.text+0x29e6): undefined reference to `swr_convert'
    read_mp3.cpp:(.text+0x2a36): undefined reference to `av_frame_free'
    read_mp3.cpp:(.text+0x2a40): undefined reference to `swr_free'
    read_mp3.cpp:(.text+0x2a48): undefined reference to `avcodec_close'
    read_mp3.cpp:(.text+0x2a52): undefined reference to `avformat_free_context'

    collect2: error: ld returned 1 exit status