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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.

• How can I add audio (mp3) to a flv (just video) with ffmpeg ?

  18 juillet 2012, par domi

  How can I add sound from a mp3-file to a flv file that has no audio ?
  (With ffmpeg)

  When I use

  ffmpeg -i video.flv -i audio.mp3 -acodec copy -vcodec copy -ab 128k -ar 44100 output.flv
  

  I get this output :
  

  FFmpeg version SVN-r12758, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    configuration : —enable-shared —prefix=/usr
    libavutil version : 49.6.0
    libavcodec version : 51.54.0
    libavformat version : 52.13.0
    libavdevice version : 52.0.0
    built on Apr  7 2008 09:00:42, gcc : 4.1.2 20070626 (Red Hat 4.1.2-14)
  [flv @ 0x2b72415e00c0]Could not find codec parameters (Audio : 0x0000)
  Input #0, flv, from 'video.flv' :
    Duration : 00:00:03.2, start : 0.000000, bitrate : N/A
      Stream #0.0 : Video : flv, yuv420p, 468x312, 1000.00 tb(r)
      Stream #0.1 : Audio : 0x0000
  mdb:511, lastbuf:0 skipping granule 0
  mdb:511, lastbuf:0 skipping granule 0
  mdb:511, lastbuf:0 skipping granule 1
  mdb:511, lastbuf:0 skipping granule 1
  Input #1, mp3, from 'audio.mp3' :
    Duration : 00:01:00.9, start : 0.000000, bitrate : 128 kb/s
      Stream #1.0 : Audio : mp3, 44100 Hz, stereo, 128 kb/s
  Output #0, flv, to 'output.flv' :
      Stream #0.0 : Video : flv, yuv420p, 468x312, q=2-31, 1000.00 tb(c)
      Stream #0.1 : Audio : 0x0000
  Stream mapping :
    Stream #0.0 -> #0.0
    Stream #0.1 -> #0.1
  [flv @ 0x2b72415e00c0]sample rate not set
  Could not write header for output file #0 (incorrect codec parameters ?)
  

• FFMPEG preset is not found ? Linux Cent OS 6

  25 août 2012, par Darius

  I ran this command

  ffmpeg -i v-16418145218d8d7abdaabec46beb22ecffd2f5d1625.flv -y -acodec aac -ac 2 -ab 160k -vcodec libx264 -vpre iPod640 -vpre slow -f mp4 -threads 0 OUTPUT.mp4

  Got this response :

  [flv @ 0x10ff670]Estimating duration from bitrate, this may be inaccurate
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 25.00 (25/1)
  
  Input #0, flv, from 'v-16418145218d8d7abdaabec46beb22ecffd2f5d1625.flv':
  
    Metadata:
  
      duration        : 14
  
      width           : 320
  
      height          : 240
  
      videodatarate   : 500
  
      framerate       : 25
  
      videocodecid    : 2
  
      audiodatarate   : 0
  
      audiosamplerate : 22050
  
      audiosamplesize : 16
  
      stereo          : true
  
      audiocodecid    : 2
  
      filesize        : 912970
  
    Duration: 00:00:13.92, start: 0.000000, bitrate: 576 kb/s
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 512 kb/s, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: mp3, 22050 Hz, 2 channels, s16, 64 kb/s
  
  File for preset 'iPod640' not found

  But after doing a find, this is what I found.

  /usr/share/ffmpeg/libx264-ipod320.ffpreset
  
  /usr/share/ffmpeg/libx264-ipod640.ffpreset **** ITS HERE ******
  
  /usr/share/ffmpeg/libx264-lossless_fast.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_max.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_medium.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_slow.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_slower.ffpreset
  
  /usr/share/ffmpeg/libx264-lossless_ultrafast.ffpreset
  
  /usr/share/ffmpeg/libx264-main.ffpreset
  
  /usr/share/ffmpeg/libx264-max.ffpreset
  
  /usr/share/ffmpeg/libx264-medium.ffpreset
  
  /usr/share/ffmpeg/libx264-medium_firstpass.ffpreset
  
  /usr/share/ffmpeg/libx264-normal.ffpreset
  
  /usr/share/ffmpeg/libx264-placebo.ffpreset
  
  /usr/share/ffmpeg/libx264-placebo_firstpass.ffpreset
  
  /usr/share/ffmpeg/libx264-slow.ffpreset
  
  /usr/share/ffmpeg/libx264-slow_firstpass.ffpreset
  
  /usr/share/ffmpeg/libx264-slower.ffpreset

  I alos tried with -vpre libx264-ipod640 and still no luck. I get preset libx264-ipod640 is not found.... Do i have to enable presets somehow ? ffmpeg — enable presets ? or something ?

  ** EDIT : My ffmpeg version info **

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    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
  
  FFmpeg 0.6.5
  
  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