Use Named Pipe (C++) to send images to FFMPEG - c++

Question

I have the following code in C++:
#include <iostream>
#include <windows.h>
#include <iostream> // std::cout
#include <fstream> // std::ifstream
#include <vector>
#include <stdlib.h>
using namespace std;
int main(int argc, const char **argv)
{
wcout << "Creating an instance of a named pipe..." << 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 << "Failed to create outbound pipe instance.";
// look up error code here using GetLastError()
system("pause");
return 1;
}
wcout << "Waiting for a client to connect to the pipe..." << endl;
// This call blocks until a client process connects to the pipe
BOOL result = ConnectNamedPipe(pipe, NULL);
if (!result) {
wcout << "Failed to make connection on named pipe." << endl;
// look up error code here using GetLastError()
CloseHandle(pipe); // close the pipe
system("pause");
return 1;
}
wcout << "Sending data to pipe..." << 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(&file_vec[0],file_size_in_byte);
out.write(&file_vec[0],file_vec.size());
wcout<<file_size_in_byte<<endl;
// This call blocks until a client process reads all the data
DWORD numBytesWritten = 0;
result = WriteFile(
pipe, // handle to our outbound pipe
&file_vec[0], // data to send
61026, // length of data to send (bytes)
&numBytesWritten, // will store actual amount of data sent
NULL // not using overlapped IO
);
if (result) {
wcout << "Number of bytes sent: " << numBytesWritten << endl;
} else {
wcout << "Failed to send data." << endl;
// look up error code here using GetLastError()
}
// Close the pipe (automatically disconnects client too)
CloseHandle(pipe);
wcout << "Done." << endl;
system("pause");
return 0;
}
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.

Answer 1

I'm doing the same thing but with normal pipe, not named one. My code is working great. Hope it helps
#include <stdio.h>
#include <iostream>
#include <iomanip>
using namespace std;
int main(int argc, char **argv) {
FILE *pPipe;
long lSize;
char * imgdata;
int imgcols = 640, imgrows = 480, elemSize = 3;
imgdata = ...;
stringstream sstm;
sstm << "/usr/local/bin/ffmpeg -y -f rawvideo -vcodec rawvideo -s " << imgcols << "x" << imgrows <<" -pix_fmt rgb24 -i - -c:v libx264 -shortest my_output.mp4";
if ( !(pPipe = popen(sstm.str().c_str(), "w")) ) {
cout << "popen error" << endl;
exit(1);
}
// open a pipe to FFmpeg
lSize = imgrows * imgcols * elemSize;
// write to pipe
fwrite(imgdata, 1, lSize, pPipe);
fflush(pPipe);
fclose(pPipe);
return 0;
}