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• For WMV files avformat_find_stream_info() shows "Extra data : 8 bits left, value : 0" message

  15 avril 2013, par Mike

  When I call avformat_find_stream_info() for wmv files, the following message is always seen :
  [wmv3 00FAEAE0] Extra data : 8 bits left, value : 0

  After that the program works as expected but anyway I would like to know what does that message mean ? Thank you !

  File info (by ffmpeg -i) :

  Duration: 00:00:06.92, start: 0.000000, bitrate: 1514 kb/s
  
  Stream #0:0(rus): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 128 kb/s
  
  Stream #0:1(rus): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 720x576, 1368 kb/s, SAR 16:15 DAR 4:3, 25 tbr, 1k tbn, 1k tbc

  Code :

  AVFormatContext*    pFormatCtx = avformat_alloc_context();
  
  if (avformat_open_input(&pFormatCtx, "file.wmv", NULL, NULL) < 0)
  
      return 0;
  
  if (avformat_find_stream_info(pFormatCtx, NULL) < 0) // HERE WE HAVE GOT THAT MESSAGE
  
      return 0;

• Warning "i686-mingw32-pkg-config not found, library detection may fail" while cross compiling ffmpeg

  12 octobre 2015, par S B

  I get the following warning while trying to cross compile ffmpeg as below

  $ ./configure --enable-gpl --enable-version3 --enable-libgsm --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libopencore_amrwb --enable-libopencore_amrnb --arch=x86 --enable-runtime-cpudetect --enable-static --disable-shared --enable-libxvid --enable-libx264 --target-os=mingw32 --enable-avisynth --enable-w32threads --cross-prefix=i686-mingw32- --cc='i686-mingw32-gcc' --enable-memalign-hack --disable-doc --enable-avfilter --disable-ffplay --disable-ffserver --disable-ffprobe

  Configure ran fine but with the following warning

  License: GPL version 3 or later
  
  Creating config.mak and config.h...
  
  libavutil/avconfig.h is unchanged
  
  
  
  WARNING: i686-mingw32-pkg-config not found, library detection may fail.

  How do I provide i686-mingw32-pkg-config to configure ?

• Opencv ffmpeg : Video capture ("Filename.avi") crashes on a non development machine - MAC 10.8.2

  8 mars 2013, par Jerry

  I was trying to deploy a simple Qt Opencv Application, the following is the code :

  Qt : .pro file :

  QT       += core gui
  
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
  
  TARGET = opencvVideoTest
  
  TEMPLATE = app
  
  
  
  SOURCES += main.cpp\
  
      mainwindow.cpp
  
  
  
  HEADERS  += mainwindow.h
  
  
  
  FORMS    += mainwindow.ui
  
  
  
  INCLUDEPATH = -I/usr/local/include
  
  
  
  LIBS += -lm -lopencv_core -lopencv_highgui -lopencv_imgproc

  Mainwindow.cpp :

  #include "mainwindow.h"
  
  #include "ui_mainwindow.h"
  
  #include <opencv2></opencv2>core/core.hpp>
  
  #include <opencv></opencv>cv.h>
  
  #include <opencv2></opencv2>highgui/highgui.hpp>
  
  #include <opencv2></opencv2>imgproc/imgproc.hpp>
  
  
  
  
  
  MainWindow::MainWindow(QWidget *parent) :
  
      QMainWindow(parent),
  
      ui(new Ui::MainWindow)
  
  {
  
      ui->setupUi(this);
  
  
  
      cv::Mat img;
  
  
  
     cv::VideoCapture cap("BMWM5.avi");
  
  
  
     if(cap.isOpened()){
  
  
  
     for(;;){
  
         cap.read(img);
  
         cv::resize(img,img,cv::Size(604,480));
  
         cv::imshow("Opencv", img);
  
         cv::waitKey(33);
  
     }
  
     }
  
     else{
  
  
  
     }
  
  
  
  
  
  }
  
  
  
  MainWindow::~MainWindow()
  
  {
  
      delete ui;
  
  }

  The above snippet works fine on the development machine, which by the has Opencv 2.4.3, ffmpeg 1.1.2 & Qt 5.0.1. This what happens when I try to deploy, running the otool before using macdeployqt and the output :

  >   /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
  
   version 169.3.0)   /usr/local/opt/opencv/lib/libopencv_core.2.4.3.dylib
  
   (compatibility version 2.4.0, current version 2.4.3)
  
   >  /usr/local/opt/opencv/lib/libopencv_highgui.2.4.3.dylib
  
   (compatibility version 2.4.0, current version 2.4.3)
  
  >   /usr/local/opt/opencv/lib/libopencv_imgproc.2.4.3.dylib
  
     (compatibility version 2.4.0, current version 2.4.3)
  
  >   /usr/local/Qt5.0.1/5.0.1/clang_64/lib/QtWidgets.framework/Versions/5/QtWidgets
  
    (compatibility version 5.0.0, current version 5.0.1)
  
  >   /usr/local/Qt5.0.1/5.0.1/clang_64/lib/QtGui.framework/Versions/5/QtGui
  
    (compatibility version 5.0.0, current version 5.0.1)
  
  >   /usr/local/Qt5.0.1/5.0.1/clang_64/lib/QtCore.framework/Versions/5/QtCore
  
    (compatibility version 5.0.0, current version 5.0.1)
  
  >   /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
  
    (compatibility version 1.0.0, current version 1.0.0)
  
  >   /System/Library/Frameworks/AGL.framework/Versions/A/AGL
  
    (compatibility version 1.0.0, current version 1.0.0)
  
  >   /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current
  
    version 56.0.0)

  otool after macdeployqt output :

  /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 169.3.0)
  
      @executable_path/../Frameworks/libopencv_core.2.4.3.dylib (compatibility version 2.4.0, current version 2.4.3)
  
    @executable_path/../Frameworks/libopencv_highgui.2.4.3.dylib (compatibility version 2.4.0, current version 2.4.3)
  
    @executable_path/../Frameworks/libopencv_imgproc.2.4.3.dylib (compatibility version 2.4.0, current version 2.4.3)
  
    @executable_path/../Frameworks/QtWidgets.framework/Versions/5/QtWidgets

  (compatibility version 5.0.0, current version 5.0.1)
  @executable_path/../Frameworks/QtGui.framework/Versions/5/QtGui (compatibility version 5.0.0, current version 5.0.1)
  @executable_path/../Frameworks/QtCore.framework/Versions/5/QtCore (compatibility version 5.0.0, current version 5.0.1)
  /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
  /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
  /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 56.0.0)

  But after deploying it, when I try and run the app on the user's machine it crashes, no error reported either, the exact samething used to happen in Windows but when I copied the opencv_ffmpeg.dll into the exe folder it worked fine. I tried to use the same logic here and failed, then I manually addded each lib files of all the ffmpeg and its dependency into the project folder and still failed. Any other solution, please help ? I'm a newbie to mac dpeloyment. Am i missing or overlooked something ?