Hello all
Several hours now spent for still cannot use opencv with mp4 files... on Zesty
I compiled FFMPEG from git with options:
./configure --prefix="$HOME/ffmpeg_build" --pkg-config-flags="--static" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --extra-libs="-lpthread -lm" --bindir="$HOME/bin" --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree --enable-pic --enable-avresample
Then I modified opencv cmake/OpenCVFindLibsVideo.cmake:239 in order to check for FFMPEG fatal compilation errors and I got :
make[1]: Entering directory
'/home/guilmort/opencv-3.3.1/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_846ee.dir/ffmpeg_test.cpp.o
/usr/bin/c++ -I/usr/local/include -I/home/guilmort/ffmpeg_build/include
-fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor
-Werror=address -Werror=sequence-point -Wformat -Werror=format-security
-Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow
-Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing
-Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option
-Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -msse
-msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG
-o CMakeFiles/cmTC_846ee.dir/ffmpeg_test.cpp.o -c
/home/guilmort/opencv-3.3.1/cmake/checks/ffmpeg_test.cpp
Linking CXX executable cmTC_846ee
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_846ee.dir/link.txt
--verbose=1
/usr/bin/c++ -fsigned-char -W -Wall -Werror=return-type
-Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat
-Werror=format-security -Wmissing-declarations -Wundef -Winit-self
-Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self
-Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment
-fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer
-ffunction-sections -msse -msse2 -msse3 -fvisibility=hidden
-fvisibility-inlines-hidden -O3 -DNDEBUG
CMakeFiles/cmTC_846ee.dir/ffmpeg_test.cpp.o -o cmTC_846ee -L/usr/local/lib
-L/home/guilmort/ffmpeg_build/lib
-Wl,-rpath,/usr/local/lib:/home/guilmort/ffmpeg_build/lib -rdynamic
-lavformat -lxcb -lX11 -lm -llzma -lz -lavcodec -lswresample -lswscale
-lavutil -lva -lva-drm -lva-x11 -lvdpau
/usr/bin/ld: /usr/local/lib/libavformat.a(utils.o): relocation R_X86_64_32
against `.rodata.str1.1' can not be used when making a shared object;
recompile with -fPIC
/usr/bin/ld: /usr/local/lib/libavformat.a(avio.o): relocation R_X86_64_32
against `.rodata.str1.1' can not be used when making a shared object;
recompile with -fPIC
/usr/bin/ld: /usr/local/lib/libavformat.a(aviobuf.o): relocation
R_X86_64_32 against symbol `ffurl_context_class' can not be used when
making a shared object; recompile with -fPIC
/usr/bin/ld: /usr/local/lib/libavformat.a(format.o): relocation R_X86_64_32
against `.rodata.str1.1' can not be used when making a shared object;
recompile with -fPIC................................................
and so on for several others. Could you help to unblock this situation?
Thanks in advance. Best.