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• Error "sys/videoio.h - not found" OpenCV 3.1.0

  9 juin 2020, par Jefferson Rodriguez

  
I using Elementary OS and I'm trying to install OpenCV 3.1.0, I follow the instructions of http://docs.opencv.org/3.0-beta/doc/tutorials/introduction/linux_install/linux_install.html
  
Also, I have installed libav 11.7 and ffmpeg 3.1.3
  
but, after cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
I get :
  
— Looking for linux/videodev.h
  
— Looking for linux/videodev.h - found
  
— Looking for linux/videodev2.h
  
— Looking for linux/videodev2.h - found
  
— Looking for sys/videoio.h
  
— Looking for sys/videoio.h - not found
  
— Looking for libavformat/avformat.h
  
— Looking for libavformat/avformat.h - found
  
— Looking for ffmpeg/avformat.h
  
— Looking for ffmpeg/avformat.h - not found
  
— checking for module 'libgphoto2'
  
— package 'libgphoto2' not found
  
And after make,
  
I get :
  
../../lib/libopencv_videoio.so.3.1.0 : referencia a av_frame_alloc&#x27; sin definir <br />&#xA;../../lib/libopencv_videoio.so.3.1.0: referencia aav_frame_free' sin definir
  
collect2 : error : ld returned 1 exit status
  
make[2] : * [bin/opencv_test_video] Error 1
  
make[1] : * [modules/video/CMakeFiles/opencv_test_video.dir/all] Error 2

  

  



  someone who can help me ?

  


• FFMpeg - applying equalizer to audio

  1er juillet 2013, par ssuukk

  There doesn't seem to be much docs on libavfilter available, but FFMpeg surely has a lot of filters. I am interested in Equalizer filter and applying it to audio. But... how do I do it programmatically ?

• FFMpeg hello world failed

  13 mai 2014, par xorange

  I’m new to the ffmpeg development.

  I’ve got my ffmpeg via ffmpeg.mplayerhq.hu/download.html using

     `git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg`

  My OS is Win7. I’m using Cygwin to help me work under a Unix-like environment.

  I’m using tutorial code from http://dranger.com/ffmpeg/ffmpeg.html. My current code is Tutorial01.

  So I’ve got my gcc, ffmpeg and code together. Working directory is /ffmpegDemo,

  code : /ffmpegDemo/tutorial01.c

  ffmpeg : /ffmpegDemo/ffmpeg

  And I use command gcc-I ffmpeg -o t01 tutorial01.c to compile my code.
  (cygwin doesn’t support "copy", here’re just some major message :)

  libavutil/avconfig.h : No such file or directory

  ...

  error : ’CODEC_TYPE_VIDEO’ undeclared

  ...

  and others are just warnings.

  Indeed, there’s no avconfig.h under ffmpeg/libavutil. I’ve looked for ’CODEC_TYPE_VIDEO’, here’s this reference : http://cekirdek.pardus.org.tr/ ismail/ffmpeg-docs/avcodec_8h.html says that ’CODEC_TYPE_VIDEO’ is defined in libavcodec/avcodec.h. I’ve checked avcodec.h and didn’t find any.

  I was very confused about this error and confused about all the "configure" and "make" things that I saw while searching for answer. Am I doing it wrong ? Did I miss some steps ? Hope that I could find an answer here.

  Thanks.