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• Compliing OpenCV with FFMPEG failing

  20 mai 2016, par moorej

  I’m trying to install OpenCV 3.1.0 on Ubuntu 14.04 with ffmpeg and python 2.7 support. I’m able to compile with :

  cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local 
  
  -D  INSTALL_C_EXAMPLES=OFF -D INSTALL_PYTHON_EXAMPLES=ON 
  
  -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules 
  
  -D WITH_FFMPEG=OFF -D BUILD_EXAMPLES=ON ..

  But -D WITH_FFMPEG=ON fails with the error :

  /usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): 
  
  relocation R_X86_64_32 against `.rodata.str1.1' can not be used when
  
  making a shared object; recompile with -fPIC
  
  /usr/local/lib/libavcodec.a: error adding symbols: Bad value
  
  collect2: error: ld returned 1 exit status

  I’m compiling ffmpeg as well and I’ve looked at a number of posts relating to the problem and attempted to add —enable-pic and —enable-shared along with some other options but I have to admit I’m a bit stupid when it comes to anything compilation related. My process for compiling ffmpeg is below. Please help me with my mess. Thanks !

  mkdir ~/ffmpeg_sources
  
  
  
  #libx264
  
  cd ~/ffmpeg_sources
  
  wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
  
  tar xjvf last_x264.tar.bz2
  
  cd x264-snapshot*
  
  PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static --enable-shared --enable-pic
  
  PATH="$HOME/bin:$PATH" make -j4
  
  make install
  
  make distclean
  
  
  
  #libfdk-aac
  
  cd ~/ffmpeg_sources
  
  wget -O fdk-aac.tar.gz https://github.com/mstorsjo/fdk-aac/tarball/master
  
  tar xzvf fdk-aac.tar.gz
  
  cd mstorsjo-fdk-aac*
  
  autoreconf -fiv
  
  ./configure --prefix="$HOME/ffmpeg_build" --enable-shared --enable-pic
  
  make -j4
  
  make install
  
  make distclean
  
  
  
  #libmp3lame
  
  sudo apt-get install nasm
  
  cd ~/ffmpeg_sources
  
  wget http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
  
  tar xzvf lame-3.99.5.tar.gz
  
  cd lame-3.99.5
  
  ./configure --prefix="$HOME/ffmpeg_build" --enable-nasm --enable-shared --enable-pic
  
  make -j4
  
  make install
  
  make distclean
  
  
  
  #libopus
  
  cd ~/ffmpeg_sources
  
  wget http://downloads.xiph.org/releases/opus/opus-1.1.tar.gz
  
  tar xzvf opus-1.1.tar.gz
  
  cd opus-1.1
  
  ./configure --prefix="$HOME/ffmpeg_build" --enable-shared --enable-pic
  
  make -j4
  
  make install
  
  make clean
  
  
  
  #libvpx
  
  cd ~/ffmpeg_sources
  
  wget http://storage.googleapis.com/downloads.webmproject.org/releases/webm/libvpx-1.5.0.tar.bz2
  
  tar xjvf libvpx-1.5.0.tar.bz2
  
  cd libvpx-1.5.0
  
  PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-shared --enable-pic
  
  PATH="$HOME/bin:$PATH" make -j4
  
  make install
  
  make clean
  
  
  
  #ffmpeg
  
  cd ~/ffmpeg_sources
  
  wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  
  tar xjvf ffmpeg-snapshot.tar.bz2
  
  cd ffmpeg
  
  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure 
  
    --prefix="$HOME/ffmpeg_build"
  
    --pkg-config-flags="--static"
  
    --extra-cflags="-I$HOME/ffmpeg_build/include"
  
    --extra-cflags="-fPIC -m64 -I$HOME/ffmpeg_build/include"
  
    --extra-ldflags="-L$HOME/ffmpeg_build/lib"
  
    --bindir="$HOME/bin"
  
    --enable-pic 
  
    --enable-shared 
  
    --enable-gpl 
  
    --enable-libass 
  
    --enable-libfdk-aac 
  
    --enable-libfreetype 
  
    --enable-libmp3lame 
  
    --enable-libopus 
  
    --enable-libtheora 
  
    --enable-libvorbis 
  
    --enable-libvpx 
  
    --enable-libx264 
  
    --enable-nonfree
  
  PATH="$HOME/bin:$PATH" make -j4
  
  make install
  
  make distclean
  
  hash -r

• node-mlt - setting argument for watermark

  3 avril 2016, par Ali Davudov

  I have get project where server get json file and media file and convert to xml. Server use mlt with node-mlt lib. My task is add watermark. I did it, but I can’t find any description for node-mlt method arguments except URL to file. node-mlt have example :

  var watermark = new MLT.Filter.Watermark({resource:'/home/jeffrey/Desktop/signature.jpg'});

  Does anybody know how I must setting opacity, size, position for this method ? Standard arguments for mlt this lib don’t recognize.

• Qt 5.2 / OpenCV 2.4.8 - Can’t open video files via VideoCapture

  4 août 2015, par Zamahra

  I have a big problem that i can’t solve by myself. OpenCV itself works fine, but i’m not able to load videos. Here’s my code :

  PRO- File

  QT       += core gui
  
  
  
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
  
  
  
  TARGET = videoredux
  
  TEMPLATE = app
  
  
  
  INCLUDEPATH += C:/OpenCV/opencv_bin/install/include
  
  LIBS += -LC:\\OpenCV\\opencv_bin\\bin \
  
      libopencv_core248d \
  
      libopencv_highgui248d \
  
      libopencv_imgproc248d \
  
      libopencv_features2d248d \
  
      libopencv_calib3d248d \
  
      libopencv_video248d \
  
  
  
  
  
  SOURCES += main.cpp\
  
          mainwindow.cpp
  
  
  
  HEADERS  += mainwindow.h
  
  
  
  FORMS    += mainwindow.ui

  and the MainWindow Class :

  #include "mainwindow.h"
  
  #include "ui_mainwindow.h"
  
  #include <qfiledialog>
  
  #include <iostream>
  
  #include 
  
  #include <opencv2></opencv2>core/core.hpp>
  
  #include <opencv2></opencv2>highgui/highgui.hpp>
  
  #include <opencv2></opencv2>imgproc/imgproc.hpp>
  
  #include <opencv></opencv>cv.h>
  
  
  
  
  
  MainWindow::MainWindow(QWidget *parent) :
  
  QMainWindow(parent),
  
  ui(new Ui::MainWindow)
  
  {
  
      ui->setupUi(this);
  
      ui->videoStatusLabel->setText("Kein Video geladen.");
  
  
  
      // SIGNALS &amp; SLOTS
  
  
  
      QObject::connect(ui->chooseVideoButton,SIGNAL(clicked()),
  
                   this,SLOT(chooseVideo()));
  
      QObject::connect(ui->startButton,SIGNAL(clicked()),
  
                   this,SLOT(startProcess()));
  
  
  
  }
  
  
  
  void MainWindow::chooseVideo(){
  
  
  
      QString fileName = QFileDialog::getOpenFileName(this,
  
           tr("Open Video"), "/home", tr("Video Files (*.avi *.mp4 *.mpeg *.mpg)"));
  
      qDebug() &lt;&lt; "Path:" &lt;&lt; fileName;
  
      ui->videoStatusLabel->setText(fileName);
  
  }
  
  
  
  void MainWindow::startProcess(){
  
      QString videoPath = ui->videoStatusLabel->text();
  
      QFileInfo video(videoPath);
  
      if(video.exists()){
  
          const std::string path = videoPath.toUtf8().constData();
  
          cv::VideoCapture capture(path);
  
          cv::Mat frame;
  
  
  
          if(!capture.isOpened()){
  
              qDebug() &lt;&lt; "Error, video not loaded";
  
          }
  
  
  
          cv::namedWindow("window",1);
  
          while(true)
  
          {
  
              bool success = capture.read(frame);
  
              if(success == false){
  
                  break;
  
              }
  
              cv::imshow("window",frame);
  
              cv::waitKey(20);
  
          }
  
          cv::waitKey(0);
  
      }
  
      else{
  
          qDebug() &lt;&lt; "Error, File doesn't exist";
  
      }
  
  }
  
  </iostream></qfiledialog>

  The paths are correct, I tried many different video formats but he never loads the videos. I’m running Qt on a Windows 8 machine and i have “K-Lite Codec Pack 10.2.0 Basic” and ffmpeg installed. The videos are playing properly with my video players. I also tried to copy the .dll to the working directory, searched for opencv dll’s in the system32 directory and rebuild OpenCV with mingw on this computer. I know that many people have the same problems, but none of their suggestions solved it. Does anyone know how to solve this problem ?

  Thank you very much !

  Nadine

  ----UPDATE---- I still can’t open video files, so I programmed the application on a Windows7 64-Bit system. It worked fine, but when I try to open the application on a Windows8 computer it still can’t open the file. It doesn’t matter which codecs are installed, because it generally runs on every Windows7 computer and fails on every Windows8 computer.. The same for older OpenCV-Versions. Is there a general problem with OpenCV and Windows8 ?