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• OpenCV 3.0.0 make error with FFMPEG

  14 octobre 2017, par Ujjwal Aryan

  I have been using OpenCV for a while. However I have recently changed my system to a cluster where I do not have any admin permission. The problem is like this :

  In my home folder, I installed FFMPEG (latest stable version available on ffmpeg site). I installed it in $HOME, and so in $HOME/lib there are the library files installed. For more information I compiled FFMPEG with following options :

  ./configure --prefix=$HOME --enable-shared --enable-pic

  I then downloaded the latest stable version of OpenCV 3.0.0 and configured it using ccmake. When I try to make -j8, it gives me the following error.

   Scanning dependencies of target opencv_videoio
  
  [ 63%] [ 63%] [ 63%] [ 63%] [ 63%] [ 63%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_decoder.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_images.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_v4l.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_encoder.cpp.o
  
  Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
  
  In file included from /home/uujjwal/libraries/opencv-nogpu/opencv-3.0.0/modules/videoio/src/cap_ffmpeg.cpp:45:0:
  
  /home/uujjwal/libraries/opencv-nogpu/opencv-3.0.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1546:71: error: use of enum 'AVCodecID' without previous declaration
  
  /home/uujjwal/libraries/opencv-nogpu/opencv-3.0.0/modules/videoio/src/cap_ffmpeg_impl.hpp:1556:83: error: use of enum 'AVCodecID' without previous declaration
  
  make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o] Error 1
  
  make[2]: *** Waiting for unfinished jobs....

  However without ffmpeg support it works fine. However I need ffmpeg support due to the nature of my work.

  In trying to resolve the problem, I tried installing OpenCV 2.4.11 but it also gave this error. The latest GIT version does not give me this error but rather an error a part of which goes like this

  Linking CXX shared library ../../lib/libopencv_highgui.so /usr/bin/ld: /home/matheus/ffmpeg_build/lib/../lib/libavcodec.a(avpacket.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used

  I have pasted the above error from another unresolved question online and so the folder names are different but the relocation error is exactly the same.

  In trying to resolve the problem I searched and found the following link http://answers.opencv.org/question/12597/build-problems-for-opencv-241-with-ubuntu-1204-lts/

  However, one of the answers over there mentioned changing some lines in cap_ffmpeg_impl.hpp file. I tried doing that but either i am not able to do it correctly or something else is going wrong and it is not working. Exact line numbers and exact changes are not mentioned and so I am having difficulty changing things and being sure.

  I am using Fedora 19 (Schrodinger Cat) as the operating system I hope the details of my question are clear and I hope that the community would oblige me with a good response.

  Regards
  Ujjwal

• mdct15 : add inverse transform postrotation SIMD

  29 juillet 2017, par Rostislav Pehlivanov

  mdct15 : add inverse transform postrotation SIMD
  2.5ms frames :
  
  Before   (c) :  2638 decicycles in postrotate, 2097040 runs,    112 skips
  
  After (sse3) :  1467 decicycles in postrotate, 2097083 runs,     69 skips
  
  After (avx2) :  1244 decicycles in postrotate, 2097085 runs,     67 skips
  5ms frames :
  
  Before   (c) :  4987 decicycles in postrotate, 1048371 runs,    205 skips
  
  After (sse3) :  2644 decicycles in postrotate, 1048509 runs,     67 skips
  
  After (avx2) :  2031 decicycles in postrotate, 1048523 runs,     53 skips
  10ms frames :
  
  Before   (c) :  9153 decicycles in postrotate,  523575 runs,    713 skips
  
  After (sse3) :  5110 decicycles in postrotate,  523726 runs,    562 skips
  
  After (avx2) :  3738 decicycles in postrotate,  524223 runs,     65 skips
  20ms frames :
  
  Before   (c) : 17857 decicycles in postrotate,  261866 runs,    278 skips
  
  After (sse3) : 10041 decicycles in postrotate,  261746 runs,    398 skips
  
  After (avx2) :  7050 decicycles in postrotate,  262116 runs,     28 skips
  Improves total decoding performance for real world content by 9% with avx2.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/mdct15.c
  • [DH] libavcodec/mdct15.h
  • [DH] libavcodec/x86/mdct15.asm
  • [DH] libavcodec/x86/mdct15_init.c

• Merge remote-tracking branch ’cehoyos/master’

  7 mai 2015, par Michael Niedermayer

  Merge remote-tracking branch ’cehoyos/master’
  * cehoyos/master :
  
    lavf/img2dec : Autodetect qdraw images.
  
    lavc/qdrw : Also support real-world qdraw images.
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/qdrw.c
  • [DH] libavcodec/version.h
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/img2dec.c
  • [DH] libavformat/version.h