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

  11 décembre 2020, par user4351838

  I have already tried : 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 do have ffmpeg installed (using brew). Does anyone know ?

  


• How to limit cpu usage for a terminal command that works on m1 mac and macOS Monterey ?

  18 juin 2024, par mcaay

  I have a m1 macbook pro and I regularly need to do some heave processing with ffmpeg. When I do it, all my 8 cores go at it 100% and my cpu temperature goes to 92°C, which I don't feel comfortable about.

  


  I don't really need 100% speed, I'd much rather see 80°C and wait 5x longer for it to finish.

  


  I use Macs Fan Control which sets my fan at 100% at 75°C, so this helps definitely, but is not enough.

  


  I tried ffmpeg -threads 1 parameter but it doesn't make a difference in compressing speed nor temperature, so I assume it just doesn't work.

  


  I tried cpulimit -l 60 -i ffmpeg ... and it doesn't change a thing, so I assume it also doesn't work. cpulimit -l value gives 100% for every core, so cpulimit -l 800 should be 100%, -l 400 should be 50% and -l 60 should be 7.5%.

  


  I tried nice and it is not for my use case. Even with the lowest priority the task uses all available cpu, resulting in 92°C.

  


  Did anybody figure it out for m1 macs already ?

  


• video not playing - moov atom not found

  28 mai 2019, par LivvyJefferson

  Video wont play - ffmpeg "moov atom not found"

  I have downloaded ffmpeg to troubleshoot the problem of why videos seemed to be corrupted - wont play on any media player, converting in VLC does not work.

  Last login: Tue May 28 10:41:47 on ttys000
  
  Livvys-MacBook-Air:~ livvy$ ffmpeg -i /Users/livvy/Desktop/help.MOV -c copy output.mov
  
  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff893008200] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff893008200] moov atom not found
  
  /Users/livvy/Desktop/help.MOV: Invalid data found when processing input
  
  Livvys-MacBook-Air:~ livvy$ 

  I have tried to install ubuntu, - to try and generate a new moov atom for the file by using a working video taken on the same device - it tells me I need to install a JVD, tried that and can’t export the file.
  Basically, I do not code and trying to do this off of various google searches.
  Is there an easier way to install a moov atom to this video without accidently effing up my computer with faulty code ? Or should I just give up and lose the videos ?

  Any help appreciated - sorry for lack of knowledge/hopelessness