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• Weird and unpredictable crash when using libx264 cross-compiled with MinGW

  2 mars 2012, par Daniel

  I'm working on a C++ project using Visual Studio 2010 on Windows. I'm linking dynamically against x264 which I built myself as a shared library using MinGW following the guide at

  http://www.ayobamiadewole.com/Blog/Others/x264compilation.aspx

  The strange thing is that my x264 code is working perfectly sometimes. Then when I change some line of code (or even change the comments in the file !) and recompile everything crashes on the line

  encoder_ = x264_encoder_open(&param);

  With the message

  Access violation reading location 0x00000000

  I'm not doing anything funky at all so it's probably not my code that is wrong but I guess there is something going wrong with the linking or maybe something is wrong with how I compiled x264.

  The full initialization code :

  x264_param_t param = { 0 };
  
  if (x264_param_default_preset(&param, "ultrafast", "zerolatency") < 0) {
  
    throw KStreamerException("x264_param_default_preset failed");
  
  }
  
  
  
  param.i_threads = 1;
  
  param.i_width = 640;
  
  param.i_height = 480;
  
  param.i_fps_num = 10;
  
  param.i_fps_den = 1;
  
  
  
  encoder_ = x264_encoder_open(&param); // <-----
  
  if (encoder_ == 0) {
  
    throw KStreamerException("x264_encoder_open failed");
  
  }
  
  
  
  x264_picture_alloc(&pic_, X264_CSP_I420, 640, 480);

  Edit : It turns out that it always works in Release mode and when using superfast instead of ultrafast it also works in Debug mode 100%. Could it be that the ultrafast mode is doing some crazy optimizations that the debugger doesn't like ?

• Catch if the Java proccess crashed

  17 janvier 2012, par VSheyanov

  I run java process to convert video using ffmpeg.exe.

  Runtime rt = Runtime.getRuntime();
  
  String cmd = FFMPEGFULLPATH + " -y -i " + '"' + mpeg4File + '"' + " -vcodec libx264 -vsync 2 " + '"' + H264file + '"';
  
  
  
  Process pr = rt.exec(cmd);
  
  
  
  ThreadedTranscoderIO errorHandler = new ThreadedTranscoderIO(pr.getErrorStream(), "Error Stream");
  
  errorHandler.start();
  
  ThreadedTranscoderIO inputHandler = new ThreadedTranscoderIO(pr.getInputStream(), "Output Stream");
  
  inputHandler.start();
  
  
  
  try {
  
        pr.waitFor();
  
  } catch (InterruptedException e) {
  
        LiveApplication.logger.info("Some shit happens during convertation 2 ");
  
        throw new IOException("UseTranscoderBlocking - Run_FFMPEG - process interrupted " + e);                  
  
  }

  But when the process started, sometimes especially with big files, but not always i get this windows message :

  

  This happens only on Windows server 2008 and didn't happened on Windows 7.

  I have 2 questions :

  1. Why this process fails ?
  2. Can I catch this fail in Java, close
     this window and continue thread execution (maybe I'll restart this
     proccess).

  Thanks !

• FFMPEG : could not run filter error

  3 octobre 2013, par Vigo

  I have static builds for FFMPEG. I run a video streaming command from the console. I get a 'could not run filter error'.

  

  What are the generic causes of this error ? Is it an issue with the parameters passed or is it something to do with the video capturing device (in my case, Webcam) itself ? Could anyone throw some light on this ?