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• How to pipe multiple files to ffmpeg ?

  14 août 2013, par Olung

  I am trying to make a bash script that searches all subfolders on given path for .mov files and converts them with ffmpeg and outputs them in an destination folder, keeping the clip name.

  I'm very new to scripting and I'm having a hard time finding out how to solve this.

  So far I've tried using ls and find to output the filepaths, but have no idea how to pipe this to ffmpeg in the right way.

  Any clues ?

  Edit :

  got some sucess with this :

  #!/bin/bash
  
  
  
  echo "drop source folder: "
  
  read source
  
  
  
  echo "drop destination folder: "
  
  read des
  
  
  
  find "$source" -name '*.mov' -exec sh -c 'ffmpeg -i "$0" -vcodec prores -profile:v 0 -an "$des/${0%%.mov}.mov"' {} \;
  
  exit;

  but, the it seems to output to the source folder asking for a overwrite. How can i setup the parameters correctly so it outputs to the "destination folder" and keeps the filenames ?

• ffmpeg in a bash pipe

  27 décembre 2019, par Martin Wang

  I have a rmvb file path list, and want to convert this files to mp4 files. So I hope to use bash pipeline to handle it. The code is

  Convert() {
  
      ffmpeg -i "$1" -vcodec mpeg4 -sameq -acodec aac -strict experimental "$1.mp4"
  
  }
  
  
  
  Convert_loop(){
  
      while read line; do
  
         Convert $line
  
      done
  
  }
  
  
  
  cat list.txt | Convert_loop

  However, it only handle the first file and the pipe exits.

  So, does ffmpeg affect the bash pipe ?

• Use Named Pipe (C++) to send images to FFMPEG

  28 août 2015, par user1829136

  I have the following code in C++ :

  #include <iostream>
  
  #include 
  
  #include <iostream>     // std::cout
  
  #include <fstream>      // std::ifstream
  
  #include <vector> 
  
  #include 
  
  
  
  using namespace std;
  
  
  
  int main(int argc, const char **argv)
  
  {
  
      wcout &lt;&lt; "Creating an instance of a named pipe..." &lt;&lt; endl;
  
  
  
      // Create a pipe to send data
  
      HANDLE pipe = CreateNamedPipe(
  
          L"\\\\.\\pipe\\my_pipe", // name of the pipe
  
          PIPE_ACCESS_OUTBOUND, // 1-way pipe -- send only
  
          PIPE_TYPE_BYTE, // send data as a byte stream
  
          1, // only allow 1 instance of this pipe
  
          0, // no outbound buffer
  
          0, // no inbound buffer
  
          0, // use default wait time
  
          NULL // use default security attributes
  
      );
  
  
  
      if (pipe == NULL || pipe == INVALID_HANDLE_VALUE) {
  
          wcout &lt;&lt; "Failed to create outbound pipe instance.";
  
          // look up error code here using GetLastError()
  
          system("pause");
  
          return 1;
  
      }
  
  
  
      wcout &lt;&lt; "Waiting for a client to connect to the pipe..." &lt;&lt; endl;
  
  
  
      // This call blocks until a client process connects to the pipe
  
      BOOL result = ConnectNamedPipe(pipe, NULL);
  
      if (!result) {
  
          wcout &lt;&lt; "Failed to make connection on named pipe." &lt;&lt; endl;
  
          // look up error code here using GetLastError()
  
          CloseHandle(pipe); // close the pipe
  
          system("pause");
  
          return 1;
  
      }
  
  
  
      wcout &lt;&lt; "Sending data to pipe..." &lt;&lt; endl;
  
  
  
      //opening file
  
      ifstream infile;
  
      infile.open("E:/xmen.jpg",std::ios::binary);
  
      ofstream out("E:/lelel.jpg",std::ios::binary);
  
  
  
      infile.seekg(0,std::ios::end);
  
      size_t file_size_in_byte = infile.tellg();
  
      vector<char> file_vec;
  
  
  
      file_vec.resize(file_size_in_byte);
  
  
  
      infile.seekg(0,std::ios::beg);
  
      infile.read(&amp;file_vec[0],file_size_in_byte);
  
  
  
      out.write(&amp;file_vec[0],file_vec.size());
  
  
  
      wcout&lt;/ This call blocks until a client process reads all the data
  
      DWORD numBytesWritten = 0;
  
      result = WriteFile(
  
          pipe, // handle to our outbound pipe
  
          &amp;file_vec[0], // data to send
  
          61026, // length of data to send (bytes)
  
          &amp;numBytesWritten, // will store actual amount of data sent
  
          NULL // not using overlapped IO
  
      );
  
  
  
  
  
      if (result) {
  
          wcout &lt;&lt; "Number of bytes sent: " &lt;&lt; numBytesWritten &lt;&lt; endl;
  
      } else {
  
          wcout &lt;&lt; "Failed to send data." &lt;&lt; endl;
  
          // look up error code here using GetLastError()
  
      }
  
  
  
      // Close the pipe (automatically disconnects client too)
  
      CloseHandle(pipe);
  
  
  
      wcout &lt;&lt; "Done." &lt;&lt; endl;
  
  
  
      system("pause");
  
      return 0;
  
  }
  
  </char></vector></fstream></iostream></iostream>

  Which I use to create a named pipe \.\pipe\my_pipe, to which FFMPEG connects to, using the following command :

  64-static\bin\Video>ffmpeg.exe -loop 1 -s 4cif -f image2 -y -i \\.\pipe\\my_pipe

  -r 25 -vframes 250 -vcodec rawvideo -an eaeew.mov

  Output :

  ffmpeg version N-54233-g86190af Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 27 2013 16:49:12 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib  libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 17.100 / 55. 17.100
  
    libavformat    55. 10.100 / 55. 10.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [image2 @ 0000000003ee04a0] Could find no file with with path '\\.\pipe\\my_pipe
  
  ' and index in the range 0-4
  
  \\.\pipe\\my_pipe: No such file or directory

  I can see on my console that my C++ app received a connection, but I get the error above in FFMPEG. Can someone please advise ?

  EDIT 1
  Using the command below

  ffmpeg.exe -s 4cif -i \\.\pipe\my_pipe -r 25 -vframes 250 -vcodec rawvideo -an tess.mov

  I get the following output

  ffmpeg version N-54233-g86190af Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 27 2013 16:49:12 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 17.100 / 55. 17.100
  
    libavformat    55. 10.100 / 55. 10.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  \\.\pipe\my_pipe: Invalid data found when processing input

  So, now it seems it was able to connect to the pipe but is not able to process the input.