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• Redirect ffmpeg console output to a string or a file in C++

  21 juillet 2019, par NeoFahrenheit

  I’m trying to use ffmpeg to do some operations for me. It’s really simple for now. I want to omit the ffmpeg output in my console, either redirecting them to strings or a .txt file that I can control. I’m on Windows 10.

  I have tried _popen (with and "r" and "w") and system("ffmpeg command > output.txt")’, with no success.

  #include <iostream>
  
  #include 
  
  using namespace std;
  
  
  
  #define BUFSIZE 256
  
  
  
  int main()
  
  {
  
      /* 1.
  
      x = system("ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4 > output.txt");
  
      */
  
  
  
      /* 2.
  
      FILE* p;
  
      p = _popen("ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4", "w");
  
      _pclose(p);
  
      */
  
  
  
      /* 3.
  
      char cmd[200] = { "ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4" };
  
  
  
      char buf[BUFSIZE];
  
      FILE* fp;
  
  
  
      if ((fp = _popen(cmd, "r")) == NULL) {
  
          printf("Error opening pipe!\n");
  
          return -1;
  
      }
  
  
  
      while (fgets(buf, BUFSIZE, fp) != NULL) {
  
          // Do whatever you want here...
  
          // printf("OUTPUT: %s", buf);
  
      }
  
  
  
      if (_pclose(fp)) {
  
          printf("Command not found or exited with error status\n");
  
          return -1;
  
      }
  
      */
  
  
  
  
  
      return 0;
  
  }
  
  </iostream>

  Further in the development, I would like to know when the ffmpeg process finished (maybe I can monitor the ffmpeg return value ?) or to display only the last line if the some error occurred.

• How to capture movie with Gphoto2 + ffmpeg and redirect serve to html embed

  1er avril 2021, par Doglas Antonio Dembogurski Fei

  Iam trying to capture video from Panasonic DC-GH5 camera to serve this and access from browser withoud ffserver because ffserver is deprecated

  


  Iam using Ubuntu 20.04

  


  #gphoto2 -v


gphoto2         2.5.23         gcc, popt(m), exif, cdk, aa, jpeg, readline
libgphoto2      2.5.25         standard camlibs (SKIPPING lumix), gcc, ltdl, EXIF
libgphoto2_port 0.12.0         iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi, gcc, ltdl, EXIF, USB, serial without locking


  


  Iam try this code

  


  ffmpeg -f video4linux2 -s 640x480 -r 30 -i /dev/video0 -thread_queue_size 512 -ac 1 -f alsa -i pulse -f webm -listen 1 -seekable 0 -multiple_requests 1 http://localhost:8090


  


  and embed

  


  <video src="http://localhost:8090"></video>&#xA;

  


  in index.php but don`t appear anything.
If anyone knows a way to make a server for a specific port I would appreciate it
Thank you.

  


• Redirect FFMPEG's output to multiple named pipes on Windows

  31 mai 2016, par tearvisus

  I am trying to stream video and audio data into two separate named pipes on Windows.

  ffmpeg.exe -f dshow -i video="My camera name":audio="My microphone name" -map 0:1 -ac 1 -f f32le \\.\pipe\audioStream -map 0:0 -f mjpeg \\.\pipe\videoStream

  The problem is that FFMPEG does not seem to understand that the outputs \\.\pipe\audioStream and \\.\pipe\videoStream are pipes and treats them like files.

  1. If the pipes are already created when the FFMPEG starts, it wants to overwrite them and fails.
  2. Otherwise, it complains that the path does not exist and fails.

  As far as I understand, specifying the pipe: protocol should do the trick, but I can’t figure out how to use it properly, even with a single pipe. I have tried :

  1. pipe:pipeName
  2. pipe:pipe\pipeName
  3. pipe:\\.\pipe\pipeName
  4. pipe://pipeName
  5. pipe://pipe\pipeName
  6. pipe://\\.\pipe\pipeName

  I always end up with the same result : the output is written to the console and not to the pipe. If the pipe already exists when the FFMPEG starts, nothing connects to the pipe.

  Is it possible to use FFMPEG with named pipes on Windows ? If yes, what is the proper way to do this ?