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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.

  • Convert MP3 file to play on multiple browsers [on hold]

    3 mars 2015, par AshleyW

    Is there a way I can convert MP4 files to formats like webm and mov without the use of ffmpeg so I can get videos to play on multiple browsers ?

    EDIT

    What I want to do is convert .mp4 files to mov, webm etc so they can be viewed all multiple borwsers, I am avoiding ffmpeg as from what Ive been told is it uses a lot of resources so its not ideal for normal shared hosting and more ideal for private servers.

  • Show error when build win32 version Ffmpeg in windows10,How solve it ? [duplicate]

    25 septembre 2020, par lslboy

    I build a win32 version FFmpeg for get the .dll and .lib file in windows10 follow the https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT document, I executed the command

    


        ../../../configure \
--toolchain=msvc \
--disable-programs \
--disable-d3d11va \
--disable-dxva2 \
--arch=x86 \
--enable-shared \
--enable-cross-compile \
--target-os=win32 \
--extra-cflags="-MD -DWINAPI_FAMILY=WINAPI_FAMILY_APP -D_WIN32_WINNT=0x0A00" \
--extra-ldflags="-APPCONTAINER WindowsApp.lib" \
--prefix=../../../Build/Windows10/x86


    


    everything works well, after that, I execute the command :

    


    make


    


    it shows error :

    


    \Users\LEE\Downloads\ffmpeg-snapshot\ffmpeg\Output\Windows10\x86\config.h: warning C4828: The file contains a character starting at offset 0x2da, which is invalid in the current source character set (code page 65001) .
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(59): error C2143: syntax error: missing ")" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(59): error C2143: syntax error: missing "{" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(60): warning C4228: Non-standard extension used: Ignore the qualifier after the comma in the declarator list
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(60): error C2143: syntax error: missing ";" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2371: “IMFActivate”: redefinition; different base types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\um\mfobjects.h(184): note: see the statement of "IMFActivate"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2143: syntax error: missing ";" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): warning C4142: "UINT32": benign redefinition of types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2370: “UINT32”: redefinition; different storage class
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2059: syntax error: ")"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(166): error C2143: syntax error: missing ")" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(166): error C2081: "MFT_REGISTER_TYPE_INFO": The name in the formal parameter table is illegal
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(166): error C2143: syntax error: missing "{" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(167): error C2143: syntax error: missing ";" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(168): error C2059: syntax error: "type"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(168): error C2059: syntax error: ")"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(54): error C2143: syntax error: missing ")" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(54): error C2143: syntax error: missing "{" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(55): warning C4228: Non-standard extension used: Ignore the qualifier after the comma in the declarator list
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(55): error C2143: syntax error: missing ";" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2371: “IMFActivate”: redefinition; different base types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\um\mfobjects.h(184): note: see the statement of "IMFActivate"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2143: syntax error: missing ";" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): warning C4142: "UINT32": benign redefinition of types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2370: “UINT32”: redefinition; different storage class
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2059: syntax error: ")"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(57): error C2054: "(" should be entered after "pnumMFTActivate"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(584): error C2143: syntax error: missing ")" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(584): error C2081: "MFT_REGISTER_TYPE_INFO": The name in the formal parameter table is illegal
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(584): error C2143: syntax error: missing "{" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(585): error C2143: syntax error: missing ";" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(586): error C2059: syntax error: "type"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(587): error C2059: syntax error: ")"
make: *** [/c/Users/LEE/Downloads/ffmpeg-snapshot/ffmpeg/ffbuild/common.mak:67: libavcodec/mf_utils.o] Error 2


    


    I don't know why, could you help me,thanks !

    


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