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• Revision 93ef0e0e78 : Merge "test/vpxenc.sh : Convert vpxenc() to a simple wrapper."

  9 août 2014, par Tom Finegan

  Merge "test/vpxenc.sh : Convert vpxenc() to a simple wrapper."

• Using FFMpeg with Runtime.exec() to do a simple transcoding

  1er novembre 2011, par Adam Ingmansson

  I know there are many questions touching this subject, but none have helped me solve my issue.

  Purpose :

  Transcoding a video taken,from a queue, from .mov to h.264 (for now only that)

  Solution :

  Building a java application that gets the next in the queue, transcodes it then repeat

  Problem :

  Running ffmpeg using Runtime.exec() is not working.
  Im using the StreamGobbler from this tutorial to capturing the output from the process.

  This code shows how i start my process :

  String[] command = new String[]{"./ffmpeg/ffmpeg","-i",videoFile.getPath(),"-vcodec","libx264","-fpre",preset,folder + recID + ".flv"};
  
  System.out.println("Running command..");
  
  Process p = r.exec(command);
  
  
  
   // any error message?
  
  StreamGobbler errorGobbler = new 
  
  StreamGobbler(p.getErrorStream(), "ERROR");            
  
  
  
  // any output?
  
  StreamGobbler outputGobbler = new 
  
  StreamGobbler(p.getInputStream(), "OUT");
  
  
  
  // kick them off
  
  errorGobbler.start();
  
  outputGobbler.start();
  
  
  
  //logProcessOutputAndErrors(p);
  
  
  
  int res = p.waitFor();
  
  if (res != 0) {
  
      throw new Exception("Encoding error: "+String.valueOf(res));
  
  }

  and this is the current modified version of StreamGobbler (the important part)

  InputStreamReader isr = new InputStreamReader(is);
  
  BufferedReader br = new BufferedReader(isr);
  
  String line=null;
  
  int c = 0;
  
  StringBuilder str = new StringBuilder();
  
  
  
  while (true) {
  
      c = br.read();
  
  }

  Sometimes ffmpeg just stalls, maybe waiting for my input (although there is no indication on screen).

  Sometimes it just ends.

  Sometimes (when I added the line "System.out.print((char) c) ;" in the while-loop above) i got loads of "¿¿ï" repeated over and over again, wich might be the actual encoding of the video wich I managed to capture instead of to a file.

  For those who wonders why i dont just go with a commandline or maybe even php :

  The purpose is an application that will run 24/7 transcoding anything and everything from a queue. The files are pretty large to begin with and takes about 15 min to transcode.

• Boost threads and FFmpeg : Such simple code gives me error C2064. What I do wrong way ?

  19 mars 2017, par Rella

  I have some class file.h where public : bool frameSendingFinished; is defined.
  So in class logic i create and encode video frame, now I want to send it to some server using ffmpeg. I want to send in separate thread so in one of my classes function (in file.cpp) I do :

    if (frameSendingFinished)
  
    {
  
        boost::thread UrlWriteFrame(url_context, (unsigned char *)pb_buffer, len);
  
    }
  
  
  
   ....// some other functions code etc.
  
  
  
       void VideoEncoder::UrlWriteFrame( URLContext *h, const unsigned char *buf, int size )
  
  {
  
      frameSendingFinished =false;
  
      url_write (h, (unsigned char *)buf, size);
  
      frameSendingFinished =true;
  
  }

  it works with out creation of new thread. Commenting thread line makes it compile...

  so error is error c2064 term does not evaluate to a function taking 2 arguments

  So - what shall I do with my code to make boost work with in my class ?