Recherche avancée

Sur d’autres sites (4762)

• Unknown reason of an error while debugging an Opencv project using opencv2 functions

  30 mars 2013, par Animesh Pandey

  I have openCV 2.3 and I am using Visual Studio 2010.

      ...
  
  VideoCapture cap;
  
  cap.open("Video.avi");
  
  if( !cap.isOpened() )
  
  {
  
  
  
      puts("***Could not initialize capturing...***\n");
  
      system("Pause");
  
      return 0;
  
  } ...

  This is a code snippet of the while program.
  I added a system command in order to hold the output window. I got no errors while building the project but when I began debugging, the output window had this output :

  warning: Error opening file (../../modules/highgui/src/cap_ffmpeg_impl.hpp:477)
  
  ***Could not initialize capturing...***
  
  
  
  Press any key to continue . . .

  I checked this directory, the file is available but then why is it that it doesn't open ?
  I even have the opencv_ffmpeg.dll in the bin folder with its path added to System Paths.
  Still I get this same error ....
  I even checked first 3 pages of google search I did but could not find an answer.
  So please help !

  ---

  The error which I mentioned is because, there has been an error in opening the .avi file ...
  This is the part of code in cap_ffmpeg_impl.hpp -

  int err = av_open_input_file(&ic, _filename, NULL, 0, NULL);
  
  if (err < 0) {
  
      CV_WARN("Error opening file"); //Error part
  
      goto exit_func;
  
  }

  This file is available at D :\OpenCV2.3\opencv\modules\highgui\src. When I make any changes in this file, they do not reflect on the output window and when I removed this file, even then it did not give any error !:O
  I am not able to understand what is happening ....??

• FFMPEG, pixelated frames, and webm format

  22 septembre 2016, par Abel Mohler

  It seems like every time I split a .webm video, half or more of the frames are pixelated and distorted.

  My configuration looks like the following :

  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 16:35:16 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

  Does anyone have any experience with something similar to this ? When I play the same videos with a standard ffmpeg player on the same system, they look just fine.

• Use FFmpeg in Visual Studio

  20 janvier 2016, par box

  I’m trying to use FFmpeg in a C++ project in Visual Studio 2010. I want to include the libraries as statically linked files. Simple programs like libavcodec/api-example.c compile without error and no linker error appears in the error view when starting them. However, a message box shows up after starting the application, saying that avutil-51.dll is missing. Do you have any hints on how to fix that ?

  I used the latest dev build from http://ffmpeg.zeranoe.com/builds/. Then I specified include as additional include directory, avcodec.lib ;avfilter.lib ;avformat.lib ;avutil.lib as additional dependencies and lib as additional library directory.