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  • 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.

  • Ffmpeg didn't burn srt subtitle on mkv properly

    16 janvier 2014, par user2600010

    `ffmpeg version:git-fc6de70 (2013-07-18) with libass and fontconfig support.
    command line:ffmpeg.exe -i test.mkv -vf subtitles=test.srt out.mkv
    and i got this error. :

    Metadata:
    
    encoder         : Lavf55.12.102
    
    Stream #0:0(eng): Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 1280x5
    
76 [SAR 1:1 DAR 20:9], q=-1--1, 1k tbn, 23.98 tbc (default)
    
    Stream #0:1: Audio: vorbis (libvorbis) (oV[0][0] / 0x566F), 48000 Hz, stereo
    
, fltp (default)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    
  Stream #0:1 -> #0:1 (aac -> libvorbis)
    
Press [q] to stop, [?] for help
    
[Parsed_subtitles_0 @ 00000000027b9960] Neither PlayResX nor PlayResY defined. A
    
ssuming 384x288

    http://tinypic.com/r/2ag52so/5

  • Ffmpeg didn't burn srt subtitle on mkv

    19 juillet 2013, par user2600010

    `ffmpeg version:git-fc6de70 (2013-07-18) with libass and fontconfig support.
    command line:ffmpeg.exe -i test.mkv -vf subtitles=test.srt out.mkv
    and i got this error. :

    Metadata:
    
    encoder         : Lavf55.12.102
    
    Stream #0:0(eng): Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 1280x5
    
76 [SAR 1:1 DAR 20:9], q=-1--1, 1k tbn, 23.98 tbc (default)
    
    Stream #0:1: Audio: vorbis (libvorbis) (oV[0][0] / 0x566F), 48000 Hz, stereo
    
, fltp (default)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    
  Stream #0:1 -> #0:1 (aac -> libvorbis)
    
Press [q] to stop, [?] for help
    
[Parsed_subtitles_0 @ 00000000027b9960] Neither PlayResX nor PlayResY defined. A
    
ssuming 384x288

    http://tinypic.com/r/2ag52so/5

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