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• OpenCV libopencv_core.so.2.4.1 File Not Found

  14 novembre 2013, par benrules2

  I am trying to setup OpenCV v2.4.1 with FFMPEG v0.11 support on Scientific Linux SL release 5.0 (Boron), and I am running into a problem with a missing file that seems completely undocumented. The error I am getting is as follows :

  -- Install configuration: "Release"
  
  
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cv.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cxmisc.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv/cvwimage.h
  
  -- Up-to-date: /home/s18/s1138832/OpenCV/include/opencv2/opencv.hpp
  
  CMake Error at modules/core/cmake_install.cmake:63 (FILE):
  
  file INSTALL cannot find file
  
    "/home/s18/s1138832/OpenCV/lib/libopencv_core.so.2.4.1" to install.
  
  Call Stack (most recent call first):
  
    modules/cmake_install.cmake:57 (INCLUDE)
  
    cmake_install.cmake:56 (INCLUDE)

  I honestly don't know where to begin troubleshooting this at this point. I successfully installed without ffmpeg a few days ago, but now I can't even install with ffmpeg support set to off.

  The files that link to the missing library are :

  lrwxrwxrwx 1 s1138832 s18      21 Jun 17 18:26 libopencv_core.so ->    libopencv_core.so.2.4
  
  lrwxrwxrwx 1 s1138832 s18      23 Jun 17 18:26 libopencv_core.so.2.4 -> libopencv_core.so.2.4.1

  Any advice or prods in the right direction would be much appreciated. I would also be happy to provide more info on whatever interesting details I may have omitted.

  UPDATES : This website seems to have the same error, but I can't read it and translations patchy - http://www.opencv.org.cn/forum/viewtopic.php?f=1&t=15664 ( http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.opencv.org.cn%2Fforum%2Fviewtopic.php%3Ff%3D1%26t%3D15664&act=url )

  libopencv_core.so.2.4.1 exists after "make", but "make install" deletes it somehow. I copied it and added it again, but it didn't change anything

• Mapping streams by language in FFmpeg

  6 décembre 2023, par ffmpeg123

  I have lots of files with multiple audio and subtitle languages, however the track numbers aren't consistent (the English audio stream isn't always the first) so using a command such as :

  


  ffmpeg -i "input.mkv" -map 0 -map -0:a:1 -c:v copy -c:a copy "output.mkv"


  


  doesn't yield expected results. After searching around I discovered it was possible to map streams based on language with this command :

  


  ffmpeg -i "input.mkv" -map 0 -map -0:m:language:eng -c:v copy -c:a copy "output.mkv"


  


  However -map -0:m:language:eng will remove all tracks with the English language flag. To keep the subtitle tracks you can use -map 0:s this is a good solution however, I want to know if it's possible to only map audio streams based on language. I.e.,

  


  I want to remove English audio while retaining all other streams without using stream IDs.

  


• Use ffprobe to view audio tracks by language [on hold]

  19 novembre 2016, par crosenblum

  I wish to use ffprobe to list all audio streams, and show what language is used.

  Simply this is part of me trying to find ways to automatically remove non-english tracks from video files.

  I am new to ffprobe, but have had some experience using ffmpeg.

  Because I know that there is no guarantee of what order the language tracks may be.

  That is why I think it is vital to list each track, by number, then language, then when I know this part works, figure out how to remove the non-english ones.

  Thanks for your time.