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• I recompile ffmpeg using nividia CUDA Toolkit inder to implement hardware acceleration.what is the reason of the compilation error [on hold]

  12 juillet 2017, par 秦先生

  I recompile ffmpeg in window 7 operation system using nividia CUDA Toolkit inder to implement encoder and decoder employ hardware acceleration.
  I use msys2 compile ffmpeg which Support nividia hardware acceleration,
  tried to follow the instruction on nvidias website.
  configured with ./configure —enable-nonfree —enable-nvenc —enable-cuda —enable-cuvid —ena ble-libnpp —extra-cflags=-Ilocal/include —extra-cflags=-I../include —extra-ld flags=-L../lib
  ,this is the error ,the log file ffbuild/config.log contain this error : this is the location of the previous definition
  gcc -L../lib -Wl,—nxcompat,—dynamicbase -Wl,—high-entropy-va -Wl,—as-needed -Wl,—image-base,0x140000000 -o /tmp/ffconf.eoLFY0Lt.exe /tmp/ffconf.Z00DOpJQ.o -lnppi -lnppc -lm -pthread -pthread -lpsapi -ladvapi32 -lshell32
  ../lib/nppc.lib(nppc64_80.dll.b) :(.text+0x2) : relocation truncated to fit : R_X86_64_32 against symbol `__imp_nppGetLibVersion’ defined in .idata$5 section in ../lib/nppc.lib(nppc64_80.dll.b)
  collect2 : error : ld returned 1 exit status
  ERROR : libnpp not found
  where common folder is from downloaded NVIDIA Video Codec SDK.
  My computer configuration : cpu:intel(R) core(TM) i3-4170 3.70HZ RAM 16GB operate system win7 64 bit

  I used software : ffmpeg 3.2.4 gcc 5.3.0

• configure : Filter -Wl, linker flags out for msvc compilation.

  1er avril 2020, par Carl Eugen Hoyos

  configure : Filter -Wl, linker flags out for msvc compilation.
  

  • [DH] configure

• OpenCV compilation : How to specify the location of FFmpeg library with cmake

  6 juin 2017, par Beanocean

  I want to compile OpenCV-2.13.2 with gcc-4.8.2, but the version installed in system path is gcc-4.4.6. So I installed gcc-4.8.2 in /opt/compiler/gcc-4.8.2. I compiled FFmpeg successfully with gcc-4.8.2. When I tried to compile OpenCV, I met with some problems.

  In linking stage, there were some libraries can not be found by /opt/compiler/gcc-4.8.2/bin/ld. The error message is as follows :
  

  The missing libraries are related with FFmpeg, and I have installed FFmpeg in ~/local/lib. Then I checked the file module/core/CMakeFiles/opencv_pref_core.dir/link.txt, It shows as follows :
  

  The ld just did not search the path where I installed FFmpeg. I tried two methods :

  1. add FFmpeg path to env : export LD_LIBRARY_PATH=~/local/lib:$LD_LIBRARY_PATH ;
  2. add -D FFMPEG_INCLUDE_DIRS=~/local/include -D FFMPEG_LIBRARAY_DIRS=~/local/lib to cmake options

  They did not work at all.