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• VLC3 compilation error : linking issue with the libavutil library

  4 octobre 2017, par Ivan Kolesnikov

  I tried to compile VLC3 in ubuntu15.10 a long time, but still no luck.
  I configured FFmpeg as follow :
  

   /ffmpeg-3.3.3$ ./configure —cpu=native —enable-pthreads —enable-bzlib —enable-libdc1394 —enable-libfreetype —enable-frei0r —enable-gnutls —enable-libgsm —enable-libmp3lame —enable-librtmp —enable-libopencv —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-vaapi —enable-vdpau —enable-libvorbis —enable-libvpx —enable-zlib —enable-libfdk-aac —enable-nonfree —enable-gpl —enable-swscale —enable-libcdio —enable-libxcb —enable-libx264 —enable-libxvid —enable-libopencore-amrnb —enable-version3 —enable-libopencore-amrwb —enable-libvo-amrwbenc —enable-nvenc —enable-openssl —enable-decklink —extra-cflags=-I/home/ivan/Downloads/Blackmagic_DeckLink_SDK_10.9.5/Linux/include —extra-ldflags=-ldl —extra-libs=-ldl —enable-pic

  And configured VLC3 wth the following parameters :

   /vlc-3.0.0-git$ ./configure
  —with-decklink-sdk=I/home/ivan/Downloads/Blackmagic_DeckLink_SDK_10.9.5/Linux/include —disable-chromecas

  The compilation looks fine. Then I tried :

  $ sudo make install

  And got the following error :
  

    CCLD     libavio_plugin.la
  
  /usr/local/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_free':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:899: undefined reference to `XCloseDisplay'
  
  /usr/local/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_create':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:929: undefined reference to `XOpenDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:934: undefined reference to `vaGetDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:941: undefined reference to `XDisplayName'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:931: undefined reference to `XDisplayName'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:958: undefined reference to `vaGetDisplayDRM'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:929: undefined reference to `XOpenDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:931: undefined reference to `XDisplayName'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vaapi.c:936: undefined reference to `XDisplayName'
  
  /usr/local/lib/libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_create':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:431: undefined reference to `XOpenDisplay'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:437: undefined reference to `XDisplayString'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:439: undefined reference to `XDefaultScreen'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:439: undefined reference to `vdp_device_create_x11'
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:433: undefined reference to `XDisplayName'
  
  /usr/local/lib/libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_free':
  
  /home/ivan/ffmpeg-3.3.3/libavutil/hwcontext_vdpau.c:410: undefined reference to `XCloseDisplay'
  
  collect2: error: ld returned 1 exit status
  
  Makefile:12577: recipe for target 'libavio_plugin.la' failed
  
  make[4]: *** [libavio_plugin.la] Error 1
  
  make[4]: Leaving directory '/home/ivan/vlc-3.0.0-git/modules'
  
  Makefile:25280: recipe for target 'install-recursive' failed
  
  make[3]: *** [install-recursive] Error 1
  
  make[3]: Leaving directory '/home/ivan/vlc-3.0.0-git/modules'
  
  Makefile:25679: recipe for target 'install' failed
  
  make[2]: *** [install] Error 2
  
  make[2]: Leaving directory '/home/ivan/vlc-3.0.0-git/modules'
  
  Makefile:1519: recipe for target 'install-recursive' failed
  
  make[1]: *** [install-recursive] Error 1
  
  make[1]: Leaving directory '/home/ivan/vlc-3.0.0-git'
  
  Makefile:1985: recipe for target 'install' failed

  I already saw the following questions related this situation :
  question1,
  question2,
  question3

  As I understand from these questions, I should move to the end the following libraries in the compile command :

  -lvdpau -lX11 -lva*

  But I still didn’t understand where is the place to moving these libraries.
  Please see the output results of the pkg-config command :

  $ pkg-config —libs libavcodec libavformat libswscale libavutil

  -L/usr/local/lib -lavformat -lXv -lX11 -lXext -lstdc++ -lvdpau -lva -lva-x11 -lX11 -lva -lva-drm -lva -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lxcb-shape -lxcb -lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lssl -lcrypto -lxvidcore -lx264 -lvpx -lm -lvpx -lm -lvpx -lm -lvpx -lm -lvorbisenc -lvorbis -logg -lvo-amrwbenc -ltheoraenc -ltheoradec -logg -lspeex -lschroedinger-1.0 -lrtmp -lz -lgmp -lpulse -lopus -lopenjpeg -DOPJ_STATIC /usr/lib/x86_64-linux-gnu/libopencv_calib3d.so -lopencv_calib3d /usr/lib/x86_64-linux-gnu/libopencv_contrib.so -lopencv_contrib /usr/lib/x86_64-linux-gnu/libopencv_core.so -lopencv_core /usr/lib/x86_64-linux-gnu/libopencv_features2d.so -lopencv_features2d /usr/lib/x86_64-linux-gnu/libopencv_flann.so -lopencv_flann /usr/lib/x86_64-linux-gnu/libopencv_gpu.so -lopencv_gpu /usr/lib/x86_64-linux-gnu/libopencv_highgui.so -lopencv_highgui
  /usr/lib/x86_64-linux-gnu/libopencv_imgproc.so -lopencv_imgproc
  /usr/lib/x86_64-linux-gnu/libopencv_legacy.so -lopencv_legacy
  /usr/lib/x86_64-linux-gnu/libopencv_ml.so -lopencv_ml
  /usr/lib/x86_64-linux-gnu/libopencv_objdetect.so -lopencv_objdetect
  /usr/lib/x86_64-linux-gnu/libopencv_ocl.so -lopencv_ocl
  /usr/lib/x86_64-linux-gnu/libopencv_photo.so -lopencv_photo
  /usr/lib/x86_64-linux-gnu/libopencv_stitching.so -lopencv_stitching
  /usr/lib/x86_64-linux-gnu/libopencv_superres.so -lopencv_superres
  /usr/lib/x86_64-linux-gnu/libopencv_ts.so -lopencv_ts
  /usr/lib/x86_64-linux-gnu/libopencv_video.so -lopencv_video
  /usr/lib/x86_64-linux-gnu/libopencv_videostab.so -lopencv_videostab
  -lopencore-amrwb -lopencore-amrnb -lmp3lame -lgsm -lfreetype -lfdk-aac -lgnutls -lcrystalhd -lm -llzma -lbz2 -lz -pthread -ldl -lavcodec -lXv -lX11 -lXext -lstdc++ -lvdpau -lva -lva-x11 -lX11 -lva -lva-drm -lva -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lxcb-shape -lxcb -lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lssl -lcrypto -lxvidcore -lx264 -lvpx -lm -lvpx -lm -lvpx -lm -lvpx -lm -lvorbisenc -lvorbis -logg -lvo-amrwbenc -ltheoraenc -ltheoradec -logg -lspeex -lschroedinger-1.0 -lrtmp -lz -lgmp -lpulse -lopus -lopenjpeg -DOPJ_STATIC /usr/lib/x86_64-linux-gnu/libopencv_calib3d.so -lopencv_calib3d
  /usr/lib/x86_64-linux-gnu/libopencv_contrib.so -lopencv_contrib
  /usr/lib/x86_64-linux-gnu/libopencv_core.so -lopencv_core
  /usr/lib/x86_64-linux-gnu/libopencv_features2d.so -lopencv_features2d
  /usr/lib/x86_64-linux-gnu/libopencv_flann.so -lopencv_flann
  /usr/lib/x86_64-linux-gnu/libopencv_gpu.so -lopencv_gpu
  /usr/lib/x86_64-linux-gnu/libopencv_highgui.so -lopencv_highgui
  /usr/lib/x86_64-linux-gnu/libopencv_imgproc.so -lopencv_imgproc
  /usr/lib/x86_64-linux-gnu/libopencv_legacy.so -lopencv_legacy
  /usr/lib/x86_64-linux-gnu/libopencv_ml.so -lopencv_ml
  /usr/lib/x86_64-linux-gnu/libopencv_objdetect.so -lopencv_objdetect
  /usr/lib/x86_64-linux-gnu/libopencv_ocl.so -lopencv_ocl
  /usr/lib/x86_64-linux-gnu/libopencv_photo.so -lopencv_photo
  /usr/lib/x86_64-linux-gnu/libopencv_stitching.so -lopencv_stitching
  /usr/lib/x86_64-linux-gnu/libopencv_superres.so -lopencv_superres
  /usr/lib/x86_64-linux-gnu/libopencv_ts.so -lopencv_ts
  /usr/lib/x86_64-linux-gnu/libopencv_video.so -lopencv_video
  /usr/lib/x86_64-linux-gnu/libopencv_videostab.so -lopencv_videostab
  -lopencore-amrwb -lopencore-amrnb -lmp3lame -lgsm -lfreetype -lfdk-aac -lgnutls -lcrystalhd -lm -llzma -lbz2 -lz -pthread -ldl -lswresample -lm -lswscale -lm -lavutil -lm

  And the results only for libavutil library :
  

  $ pkg-config —libs libavutil

  -L/usr/local/lib -lavutil -lm

  Please also see my VLC
  Makefile

  Can you please to point at the place where these libraries should be reordered ? Also my pkg-config output results are different from the results from the questions above. Any advice or links to solve this question will be helpful.

• FFMpegWriter() [Error 5] Access Denied

  8 juin 2016, par Guillermo

  So, I’m trying to save animations with the animation.save command. I installed ffmpeg in Windows 10 by placing a folder with its binaries in my drive C :\, I have also set the path in my system variables like C :\ffmpeg\bin, and finally, my code for the animation function saving looks like this

   if save=='True':
  
       mywriter = animation.FFMpegWriter()
  
       plt.rcParams['animation.ffmpeg_path'] = 'C:/ffmpeg/bin' 
  
       ani.save('mymovie.avi',writer=mywriter,fps=30)

  and all other kind of variants such as :

      mpl.animation.ffmpeg_path = r'C:\ffmpeg\bin' 
  
      mpl.animation.ffmpeg_path = 'C:\\ffmpeg\\bin' 

  No matter what I do, the result is always :

  File "<stdin>", line 2, in <module>
  
  File "Plot.py", line 168, in animate
  
  ani.save('mymovie.avi',writer=mywriter,fps=30)
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 801, in save
  
  with writer.saving(self._fig, filename, dpi):
  
  File "C:\Users\Guillermo\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.6.1.3253.win-x86_64\lib\contextlib.py", line 17, in __enter__
  
  return self.gen.next()
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 194, in saving
  
  self.setup(*args)
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 184, in setup
  
  self._run()
  
  File "c:\users\guillermo\appdata\local\enthought\canopy\user\lib\site-packages\matplotlib\animation.py", line 212, in _run
  
  creationflags=subprocess_creation_flags)
  
  File "C:\Users\Guillermo\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.6.1.3253.win-x86_64\lib\subprocess.py", line 710, in __init__
  
  errread, errwrite)
  
  File "C:\Users\Guillermo\AppData\Local\Enthought\Canopy\App\appdata\canopy-1.6.1.3253.win-x86_64\lib\subprocess.py", line 958, in _execute_child
  
  startupinfo)
  
  WindowsError: [Error 5] Access Denied
  
  </module></stdin>

  Any ideas ? :D

  ------------------------------------------------------------------------------

  EDIT : I will reference this answer as it is the one that helped me the best :
  http://stackoverflow.com/a/27017734/6050676

  It worked perfectly when using :

  plt.rcParams['animation.ffmpeg_path'] = 'C:\\ffmpeg\\bin\\ffmpeg.exe'  

• Error in Splitting Educational Videos into Segments Using Python (ffmpeg issue) [closed]

  28 décembre 2024, par Yahia Mohamed Hanbal

  I created a Python project to split long educational videos into smaller segments, each focused on a single question. The program uses OCR to detect text on video frames, identifies the word "Question," extracts the number following it, and splits the video whenever the number increases.

  


  here is the video i am tring to split ((video))

  


  Here’s an example of the program’s output :

  


  Video loaded: 14071 frames at 60 FPS, duration: 234.52s  
Frame 480, Time 8.00s, Question: 6  
...  
Frame 12360, Time 206.00s, Question: 7  
Creating segment 1: 8.00s to 206.00s  
Error: module 'ffmpeg' has no attribute 'Error'


  


  I’ve shared the full code in a GitHub repository for reference : Automated Video Scene Cutting.

  


  What the Program Does

  


  

  • Input : A long educational video.

  


  • Processing :

    

    • Detects text in each frame using OCR.

    


    • Searches for the word "Question" followed by a number.

    


    • Monitors when the number increases to identify segment boundaries.

    


    


  


  • Output : Creates video segments corresponding to individual questions.

  


  


  The Problem

  


  The program detects the questions and timestamps correctly, but when it tries to create the segments, I encounter the following error :

  


  Error: module 'ffmpeg' has no attribute 'Error'


  


  What I’ve Tried

  


  

  • Verified the ffmpeg-python library is installed (pip show ffmpeg-python confirms the installation).

  


  • Ensured the ffmpeg binary is accessible from the command line.

  


  • Reviewed the library documentation to ensure the correct usage of ffmpeg.

  


  • Tested with different video files to rule out input-specific issues.

  


  


  Environment Details

  


  

  • OS : Windows 11

  


  • Python Version : 3.9.13

  


  • Key Libraries : ffmpeg-python

  


  


  If anyone has insights into resolving this issue or suggestions for alternative approaches to handle this use case, I’d greatly appreciate your help.

  


  Thank you !