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• Error installing Opencv (any version) : relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object

  11 juin 2015, par Anshul

  I’m running Ubuntu 14.04 and want to install a library iai_kinect2 and it requires OpenCV to be installed. I’ve been trying to install Opencv for a day and a half now but no matter what version I try to install (after installing ffmeg correctly, after adding the —enable-pic option to the ./configure), it still gives me the same error as given above. Although I’m fairly new to Linux, I understood from what I read that this is a 32 vs 64 bit issue (i.e. some dependencies are not working correctly for the 64 bit Ubuntu that I have.

  Most forums I saw said the problem was with ffmpeg not installing correctly. I followed the instructions here and although I did not find gstreamer1.0-ffmpeg, I read that gstreamer-1.0-libav works and I installed that successfully. Also, after running cmake for opencv, it says it found ffmeg. So I don’t know how to go further to solve this issue. Any suggestions would be welcome. Thanks.

  The error I receive while running make for opencv is :

      .
  
      .
  
      [ 38%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o
  
      Linking CXX shared library ../../lib/libopencv_videoio.so
  
      /usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
  
      /usr/local/lib/libavcodec.a: error adding symbols: Bad value
  
      collect2: error: ld returned 1 exit status
  
      make[2]: *** [lib/libopencv_videoio.so.3.0.0] Error 1
  
      make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
  
      make[1]: *** Waiting for unfinished jobs....
  
      [ 38%] Building CXX object modules/shape/CMakeFiles/opencv_shape.dir/src/haus_dis.cpp.o
  
      [ 38%] Building CXX object modules/shape/CMakeFiles/opencv_shape.dir/src/aff_trans.cpp.o
  
      Linking CXX shared library ../../lib/libopencv_shape.so
  
      [ 38%] Built target opencv_shape
  
      make: *** [all] Error 2

• How to specify start and end frames when making a video with ffmpeg

  29 mai 2023, par supercool

  I am working with python in a jupyter notebook, and I am trying to use ffmpeg to specify the start and end images and convert several images from a folder into a single video. I have a folder, 'images', with the images inside labeled, 'image0', 'image1', 'image2', etc. I would like to specify the start and end images in my video. For example, I would like to be able to make the video using 'image100', to 'image200'. Right now, I have :

  


  !/home/jovyan/ffmpeg-dir/ffmpeg -i /home/jovyan/images/image%d.bmp -frames:v 1000 /home/jovyan/output.mp4


  


  This is making the video correctly, but I believe it is just taking the first 1000 images.

  


  Thanks !

  


• Revision e5fa44c869 : Using stride (# of elements) instead of pitch (bytes) in fdct8x8. Just making f

  18 octobre 2013, par Dmitry Kovalev

  Changed Paths :
   Modify /test/fdct8x8_test.cc

  
   Modify /vp9/common/vp9_rtcd_defs.sh

  
   Modify /vp9/encoder/vp9_dct.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/x86/vp9_dct_sse2.c

  
  
  Using stride (# of elements) instead of pitch (bytes) in fdct8x8.

  Just making fdct consistent with iht/idct/fht functions which all use
  stride (# of elements) as input argument.

  Change-Id : Ibc944952a192e6c7b2b6a869ec2894c01da82ed1