Recherche avancée

Sur d’autres sites (9336)

• ffmpeg x11grab Fedora 22 cannot open display [on hold]

  4 août 2015, par voor

  Running a fairly recent version of Fedora 22 :

  Linux localhost 4.1.3-200.fc22.x86_64 #1 SMP Wed Jul 22 19:51:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  Dual screen Acer XB270HU and AOC 2369. Also uses NVIDIA Drivers :

  ➜  ~  rpm -qa | grep nvidia
  
  nvidia-driver-libs-352.30-1.fc22.x86_64
  
  nvidia-driver-352.30-1.fc22.x86_64
  
  nvidia-settings-352.30-1.fc22.x86_64
  
  nvidia-libXNVCtrl-352.30-1.fc22.x86_64
  
  dkms-nvidia-352.30-1.fc22.x86_64
  
  nvidia-driver-libs-352.30-1.fc22.i686

  Whenever I attempt to do a x11grab in ffmpeg I get an error :

  ➜  ~  ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0 -vcodec h264 -crf 30 -y output.mp4
  
  ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.1.1 (GCC) 20150422 (Red Hat 5.1.1-1)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Invalid MIT-MAGIC-COOKIE-1 key[x11grab @ 0x1fe1d40] Cannot open display :0, error 1.
  
  :0: Input/output error

  I’ve tried a few different commands basically copy/pasta from the web on how to do screengrabs. I don’t need audio, just video, and all of them result in the same error.

  I am able to do xwininfo without any problems :

  ➜  ~  xwininfo    
  
  
  
  xwininfo: Please select the window about which you
  
            would like information by clicking the
  
            mouse in that window.
  
  
  
  xwininfo: Window id: 0x1e0006c "linux - ffmpeg x11grab Fedora 22 cannot open display - Stack Overflow - Google Chrome"
  
  
  
    Absolute upper-left X:  0
  
    Absolute upper-left Y:  27
  
    Relative upper-left X:  0
  
    Relative upper-left Y:  27
  
    Width: 2560
  
    Height: 1413
  
    Depth: 24
  
    Visual: 0x21
  
    Visual Class: TrueColor
  
    Border width: 0
  
    Class: InputOutput
  
    Colormap: 0x20 (installed)
  
    Bit Gravity State: ForgetGravity
  
    Window Gravity State: NorthWestGravity
  
    Backing Store State: NotUseful
  
    Save Under State: no
  
    Map State: IsViewable
  
    Override Redirect State: no
  
    Corners:  +0+27  -1920+27  -1920-0  0
  
    -geometry 2560x14130

• 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 ?

• FFMPEG with javaCV can't open stream

  29 juin 2015, par rgomes

  I having a strange behavior when testing to get the video Stream of a Mobotix camera, I’m using javaCV 0.11.
  When I set a timeout I can’t open the stream, the stream only open if I don’t set the timeout parameter.

  I verified this behavior with javaCV 0.11 and Java CV 0.11 in version 0.9 and 0.8 it works with the timeout.

  Probably an error of the lib JavaCV or the way I’m using it :P

  My question for the ffmpeg experts is the following :

  When I’m calling :

  avformat_open_input

  the function returns -138

  I called the function av_strerror fir this error code and the function was returned "Error number -138 occurred".

  A description not very useful, can someone tell me what this error means ?