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• I can't seem to install opencv2.4.13 for Python3.4 on Mac El Capitan

  1er juin 2016, par ThatProgrammerDude

  This has been driving me nuts. I have been working on this non stop for a week. I have looked at many tutorials online they did not help.

  I have tried so much I don’t even remember what I tried. I can say the last thing I tried though.. which is this video https://www.youtube.com/watch?v=U49CVY8yOxw.

  So I download opencv2.4.13, create the build folder, open cmake, configure, generate and then go to terminal and type in make.

  I get this :

  Richie's Macbook Air:build Richie$ make
  
  [  2%] Built target zlib
  
  [  6%] Built target libtiff
  
  [ 10%] Built target libjpeg
  
  [ 14%] Built target libjasper
  
  [ 16%] Built target libpng
  
  [ 23%] Built target IlmImf
  
  [ 26%] Built target opencv_core
  
  [ 31%] Built target opencv_imgproc
  
  [ 32%] Built target opencv_video
  
  [ 32%] Built target opencv_flann
  
  [ 32%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o
  
  In file included from /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg.cpp:45:
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:71:6: error: 
  
        "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"
  
      #error "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"
  
       ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:481:9: error: 
  
        use of undeclared identifier 'sws_freeContext'
  
          sws_freeContext(img_convert_ctx);
  
          ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:965:17: error: 
  
        use of undeclared identifier 'SWS_BICUBIC'
  
                  SWS_BICUBIC,
  
                  ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:998:5: error: 
  
        use of undeclared identifier 'sws_scale'
  
      sws_scale(
  
      ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:1639:46: error: 
  
        use of undeclared identifier 'SWS_BICUBIC'
  
                                               SWS_BICUBIC,
  
                                               ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:1645:14: error: 
  
        use of undeclared identifier 'sws_scale'
  
          if ( sws_scale(img_convert_ctx, input_picture->data,
  
               ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:1693:9: error: 
  
        use of undeclared identifier 'sws_freeContext'
  
          sws_freeContext(img_convert_ctx);
  
          ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:2290:9: warning: 
  
        ignoring return value of function declared with warn_unused_result
  
        attribute [-Wunused-result]
  
          avformat_write_header(oc_, NULL);
  
          ^~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~
  
  1 warning and 7 errors generated.
  
  make[2]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o] Error 1
  
  make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
  
  make: *** [all] Error 2
  
  Richie's Macbook Air:build Richie$ 

  From what I can see, it says

  "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"

  I have tried googling though to no avail, does anyone know ?

  EDIT : I do have ffmpeg installed... (brew).

• Applescript to automatically convert new downloaded MKV files using ffmpeg

  18 février 2014, par user3315469

  I'm new to Applescript and would love some help figuring out how to use it to make my life easier. I want to create a script that automatically selects new movies added to a folder (actually a folder within a folder, as I have a "Movies" folder and then each movie gets its own folder within that), checks the extensions, and converts them using the Terminal if they have extension .mkv. The Terminal command I want to run is

  ffmpeg -i -y [movie_name].mkv -c copy [movie_name].mp4

  It will need to look in the correct folder for the movie, which is already automatically created when the movie is added. So, to clarify, there's a "Movies" folder, which contains the newly created folder for a specific movie, which in turn contains the newly added movie file.

  I am running Mavericks on a MacBook Pro.

• How to hold the mpegts stream for few seconds ?

  8 août 2024, par Aven

  How to hold the mpegts stream for 5 seconds without changing frams's PTS ?

  


  I tried the tsduck command as below :

  


  aven.cheng@tgcusers-MacBook-Pro ~ % tsp -I ip 235.35.3.5:3535 -P timeshift --time 5000 -O ip 235.35.3.5:3536

* Warning: timeshift: unknown initial bitrate, discarding packets until a valid bitrate can set the buffer size


  


  the stream of 235.35.3.5:3536 did come out 5 seconds later after i executed the above command..
But the frames' PTS of 235.35.3.5:3536 are not the same anymore. For exsample, the PTS of my target frame is 10935000 from 235.35.3.5:3535, but the PTS of my target frame has changed to 10830542 from 235.35.3.5:3536.

  


  Is that possible to hold the stream for few seconds and also keep the PTS unchanged ? I don't necessarily have to use tsduck ; I am open to using other tools.