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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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Sur d’autres sites (11715)

  • 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.

  • ffmpef cannot open a simple microsoft wav file exported with Audacity

    23 juillet 2013, par sebpiq

    I have exported a sound file to microsoft wav using Audacity.
    I am trying to open this file with ffmpeg :

    ffmpeg -i steps-stereo-16b-44khz.wav /tmp/test.ogg

    and here's the ouput I get :

    fmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Jun 12 2013 13:46:11 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
    
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
    
  libavutil      52. 18.100 / 52. 18.100
    
  libavcodec     54. 92.100 / 54. 92.100
    
  libavformat    54. 63.104 / 54. 63.104
    
  libavdevice    54.  3.103 / 54.  3.103
    
  libavfilter     3. 42.103 /  3. 42.103
    
  libswscale      2.  2.100 /  2.  2.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  2.100 / 52.  2.100
    
[dca @ 0x7fd30c013600] Not a valid DCA frame
    

    
... SNIP ...
    

    
[dca @ 0x7fd5bc013600] Invalid bit allocation index
    
[dca @ 0x7fd5bc013600] error decoding block
    
    Last message repeated 3 times
    
[dca @ 0x7fd5bc013600] Didn&#39;t get subframe DSYNC
    
[dca @ 0x7fd5bc013600] error decoding block
    
[wav @ 0x7fd5bc013000] max_analyze_duration 5000000 reached at 5009070 microseconds
    
[wav @ 0x7fd5bc013000] decoding for stream 0 failed
    
[wav @ 0x7fd5bc013000] Could not find codec parameters for stream 0 (Audio: dts ([1][0][0][0] / 0x0001), 192000 Hz, 2 channels, fltp, 0 kb/s): no decodable DTS frames
    
Consider increasing the value for the &#39;analyzeduration&#39; and &#39;probesize&#39; options
    
steps-stereo-16b-44khz.wav: could not find codec parameters

    If I export the same file to .ogg or .aiff, no problem, the following works fine :

    ffmpeg -i steps-stereo-16b-44khz.aiff /tmp/test.ogg

    Any idea what could be wrong ?

    A link to my wav file so you can try to reproduce.

    NB my final goal is to slice the audio file. I know I can export file directly to .ogg with audacity. This is just a test case.

  • ffmpeg cannot open a simple microsoft wav file exported with Audacity

    18 février 2014, par sebpiq

    I have exported a sound file to microsoft wav using Audacity.
    I am trying to open this file with ffmpeg :

    ffmpeg -i steps-stereo-16b-44khz.wav /tmp/test.ogg

    and here's the ouput I get :

    fmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Jun 12 2013 13:46:11 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
    
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
    
  libavutil      52. 18.100 / 52. 18.100
    
  libavcodec     54. 92.100 / 54. 92.100
    
  libavformat    54. 63.104 / 54. 63.104
    
  libavdevice    54.  3.103 / 54.  3.103
    
  libavfilter     3. 42.103 /  3. 42.103
    
  libswscale      2.  2.100 /  2.  2.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  2.100 / 52.  2.100
    
[dca @ 0x7fd30c013600] Not a valid DCA frame
    

    
... SNIP ...
    

    
[dca @ 0x7fd5bc013600] Invalid bit allocation index
    
[dca @ 0x7fd5bc013600] error decoding block
    
    Last message repeated 3 times
    
[dca @ 0x7fd5bc013600] Didn&#39;t get subframe DSYNC
    
[dca @ 0x7fd5bc013600] error decoding block
    
[wav @ 0x7fd5bc013000] max_analyze_duration 5000000 reached at 5009070 microseconds
    
[wav @ 0x7fd5bc013000] decoding for stream 0 failed
    
[wav @ 0x7fd5bc013000] Could not find codec parameters for stream 0 (Audio: dts ([1][0][0][0] / 0x0001), 192000 Hz, 2 channels, fltp, 0 kb/s): no decodable DTS frames
    
Consider increasing the value for the &#39;analyzeduration&#39; and &#39;probesize&#39; options
    
steps-stereo-16b-44khz.wav: could not find codec parameters

    If I export the same file to .ogg or .aiff, no problem, the following works fine :

    ffmpeg -i steps-stereo-16b-44khz.aiff /tmp/test.ogg

    Any idea what could be wrong ?

    A link to my wav file so you can try to reproduce.

    NB my final goal is to slice the audio file. I know I can export file directly to .ogg with audacity. This is just a test case.

    EDIT

    Getting file info with another program like sox, works well :

    sox --info steps-stereo-16b-44khz.wav
    

    
Input File     : &#39;steps-stereo-16b-44khz.wav&#39;
    
Channels       : 2
    
Sample Rate    : 44100
    
Precision      : 16-bit
    
Duration       : 00:00:02.10 = 92608 samples = 157.497 CDDA sectors
    
File Size      : 370k
    
Bit Rate       : 1.41M
    
Sample Encoding: 16-bit Signed Integer PCM

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