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• Open .avi with OpenCV 2.4 & Ubuntu 11.04

  25 juin 2012, par CTZStef

  I try to open and read video files in .avi format using OpenCV. Here is my code :

  void MainWindow::on_actionOuvrir_fichier_triggered()
  
   140    +   {
  
   141    +    //mettre a -1 streamId
  
   142    +    streamId = -1;
  
   143    +    //ouvrir fenetre navigation fichiers pour recuperer path vers .avi
  
   144    +    QString fileName = QFileDialog::getOpenFileName(this,tr("Ouvrir fichier video"),"/home",
  
   145    +    tr("Videos (*.avi)"));
  
   146    +    std::string utf8_text = fileName.toUtf8().constData();
  
   147    +    //ouvrir .avi
  
   148    +    capture = new VideoCapture(utf8_text);
  
   149    +    //check ouverture
  
   150    +    if(!capture->isOpened())
  
   151    +    cout << "probleme ouverture fichier video" << endl;
  
   152    +    //calculer delay between each frame in ms
  
   153    +    rate = capture->get(CV_CAP_PROP_FPS);
  
   154    +    delay = 1000 / rate;
  
   155    +    //demarrer timer recordId
  
   156    +    recordId = startTimer(delay);
  
   157    +    //capture premiere frame
  
   158    +    if(!capture->read(in))
  
   159    +    cout << "probleme lecture frame fichier video" << endl;
  
   160    +   }

  I get no problem at compilation time, but I can't open a video file. While in debug mode I saw that string utf8_text had the good absolute path to my video, so obviously the problem comes from the constructor of the VideoCapture object. Then, I tried to install every codec pack I could or thought was relevant. But the problem is still there, capture->isOpened() still returns false, and in debug mode I can see that capture contains nothing.

  I am lost here, don't know what to try next. Any idea ??

  Thanks !!!

  [EDIT]
  Just in case, here is the output of ffmpeg -i myFile.avi

  faraday@faraday-Compaq-Evo-D510-e-pc:~/QtProjects/visionDev$ ffmpeg -i 1.avi
  
  FFmpeg version 0.6.6-4:0.6.6-0ubuntu0.11.04.1, Copyright (c) 2000-2010 the Libav developers
  
    built on Jun 12 2012 16:28:21 with gcc 4.5.2
  
    configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
    WARNING: library configuration mismatch
  
    libavutil   configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavcodec  configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavformat configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavdevice configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavfilter configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libswscale  configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libpostproc configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  Input #0, avi, from '1.avi':
  
    Duration: 00:02:35.39, start: 0.000000, bitrate: 110595 kb/s
  
      Stream #0.0: Video: rawvideo, bgr24, 640x480, 15 tbr, 15 tbn, 15 tbc
  
  At least one output file must be specified

  I do not see anything wrong here, but I thought maybe someone will.

  I really need this to work soon, and right now it's a dead end...

  thanks

  [EDIT 2]

  I have just read this in the book OpenCV 2 Computer Vision Application Programming Cookbook by R. Laganiere :

  It is important to note that in order to open the specified video
  file, your computer must have the corresponding codec installed,
  otherwise cv::VideoCapture will not be able to understand the input
  file. Normally, if you are able to open your video file with a video
  player on your machine (such as the Windows Media Player), then OpenCV
  should also be able to read this file.

  Well, on my machine it is not that easy mister Laganiere... I hate this book.

• FFMPEG Error, any ideas on how to fix the issue ?

  28 décembre 2013, par user3120703

  Hello i have installed xampp on my windows computer and running it as a home server, i want to install ffmpeg and it keeps coming up with an error and ive looked everywhere but found nothing ! any ideas of whats going on and how to fix this ?

  The image of the error - http://fktwtv.sytes.net/error.png

• after split mp4 file audio is little out of video, please tell me why ?

  27 décembre 2013, par user3138206

  I tried to split mp4 h.264 format video(running time 70min) split 3 min each.
  everything is ok but audio is little out of video

  /usr/bin/ffmpeg -y -i /home/vmark/T2010.mp4 -acodec copy -vcodec copy -ss 1260 -t 180 ./131018_1260_1440.mp4

  is there any wrong option I did ?
  please let me know if you know how to fix this problem and the way to split without audio video sync problem.

  thanks.

  JEONG.