Compile error with FFMPEG (Bug #4053)

Added by András Kovács over 10 years ago. Updated almost 10 years ago.

Status:Cancelled Start date:2014-12-09
Priority:Normal Due date:
Assignee:- % Done:

0%
Category:build/install
Target version:3.0
Affected version:branch 'master' (3.0-dev) Operating System:Linux
Difficulty: HW Platform:x64
Pull request:

Description

I get the following error, if I compile the 3.0 beta version under linux mint 17.1 (all build tools up to date), having ffmpeg istalled:

/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
make2: * [lib/libopencv_videoio.so.3.0.0] Error 1
make1: [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
make1: ** Waiting for unfinished jobs....

ps: (master branch also affected)

Associated revisions

Revision dc587992
Added by Vadim Pisarevsky almost 10 years ago

Merge pull request #4053 from vpisarev:calib3d_fixes

History

#1
Updated by Youssef Kashef almost 10 years ago

Was ffmpeg installed via apt-get? If so, can you check if any shared objects were installed under /usr/local/lib/ (e.g. /usr/local/lib/libavcodec.so).
Apt-get doesn't give you much control over how libraries are built. but there are a few things you can try:

  • Building ffmpeg from source as shared objects OR as static libs with '-fPIC' in the cxxflags.
  • Building OpenCV as static libs by setting -DBUILD_SHARED_LIBS=OFF in your cmake command. That way you can link to the installed ffmpeg libs.

This kind of error is generated when linking a shared object to a static lib that was built without position independent code. It's not specific to OpenCV. It can happen with any C++ library. Are any of the above solutions applicable to your situation?

#2
Updated by Vadim Pisarevsky almost 10 years ago

that's right; I do not see how we can be sure that we link to properly built ffmpeg or not. Please, rebuild ffmpeg from source or find some alternative binary packages

  • Status changed from New to Cancelled
  • Category changed from highgui-video to build/install

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