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• Setting a timeout for av_read_frame

  20 décembre 2014, par user3663917

  I am new to FFMPEG and was trying to do HLS streaming using FFMPEG. When i tried using the function "av_read_frame" it returns a negative value whenever data is not available. Is there some method to make this function wait till some data is received or to make this function wait till a timeout is reached ?

• Bambuser ffmpeg - "arm-linux-androideabi-gcc is unable to create an executable file."

  14 avril 2014, par Chaitanya Chandurkar

  I know this may be possible duplicate of some questions. but answers for those threads are not helping me.

  I am trying to compile ffmpeg library for android using Bambuser's ffmpeg.
  I downloaded Archive for client versions 1.3.7 to 1.6.0. from bambuser.

  I followed instruction given in REAME.
  While running ./build.sh i came across following error

  arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from SVN.  If the latest version fails, report the problem to the
  
  ffmpeg-user@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.

  Here are last few lines of config.log of ffmpeg

  mktemp is /bin/mktemp
  
  check_ld
  
  check_cc
  
  BEGIN /tmp/ffconf.qflVj27Q.c
  
      1   int main(void){ return 0; }
  
  END /tmp/ffconf.qflVj27Q.c
  
  arm-linux-androideabi-gcc --sysroot=/home/chaitanya/android/android-ndk-r5b/platforms/android-8/arch-arm -c -o /tmp/ffconf.gc6um0Ki.o /tmp/ffconf.qflVj27Q.c
  
  arm-linux-androideabi-gcc: error trying to exec 'cc1': execvp: No such file or directory
  
  C compiler test failed.

  in tmp i do not find any relative folder or file as per config.log says "ffconf.qflVj27Q.c".

  I am doing this on
  1. Ubuntu 11.10
  2. OpenJDK 6
  3. android-ndk-r5b

  NOte :
  I only have API-10 Installed in eclipse. (if it matters :D)

  What could be the solution for this ?

• 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 ?