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• "Relocation cannot be used against local symbol" only for one platform (x86)

  10 janvier 2023, par JonasVautherin

  Problem

  


  I am cross-compiling gstreamer using Meson, and it works for 3 different platforms (android-arm, android-arm64, android-x86_64) but fails for android-x86 with errors like :

  


  ld: error: relocation R_386_32 cannot be used against local symbol; recompile with -fPIC


  


  I can't seem to understand which component was not built with -fPIC, and I don't understand why this would differ between the 4 platforms. If 3 are built with -fPIC, why would the fourth be different ?

  


  Details

  


  More specifically, it fails with a bunch of the following errors :

  


  FAILED: subprojects/FFmpeg/test_avcodec_utils
/usr/i686-linux-android/bin/clang  -o subprojects/FFmpeg/test_avcodec_utils subprojects/FFmpeg/test_avcodec_utils.p/libavcodec_tests_utils.c.o -Wl,--as-needed -Wl,--no-undefined -Wl,-O1 -pie -Wl,-Bsymbolic -fPIC -Wl,--start-group subprojects/FFmpeg/libavcodec-static.a subprojects/FFmpeg/libavutil.a subprojects/FFmpeg/libavutil-static.a subprojects/FFmpeg/libswresample.a subprojects/FFmpeg/libswresample-static.a -pthread -lm -lz -lz -Wl,--end-group
ld: error: relocation R_386_32 cannot be used against local symbol; recompile with -fPIC
>>> defined in subprojects/FFmpeg/libavcodec-static.a(libavcodec-static.a.p/dirac_dwt.o)
>>> referenced by x86util.asm:1315 (/work/build/android-x86/dependencies/gstreamer/gstreamer/src/gstreamer/subprojects/FFmpeg/libavutil/x86/x86util.asm:1315)
>>>               libavcodec-static.a.p/dirac_dwt.o:(.text+0x9F) in archive subprojects/FFmpeg/libavcodec-static.a


  


  I essentially run $ meson setup --cross-file my-crossfile build . in a Dockcross container, with some options, so nothing special there as far as I can tell.

  


  My cross-file looks like this (similar to the other 3 that work, except for cpu and cpu_family that differ) :

  


  [constants]
cross_triple = 'i686-linux-android'
cross_root = '/usr/' + cross_triple

[properties]
pkg_config_libdir = ''

[binaries]
c = cross_root + '/bin/clang'
cpp = cross_root + '/bin/clang++'
ar = cross_root + '/bin/llvm-ar'
as = cross_root + '/bin/llvm-as'
ranlib = cross_root + '/bin/llvm-ranlib'
ld = cross_root + '/bin/ld'
strip = cross_root + '/bin/llvm-strip'
pkgconfig = 'pkg-config'

[host_machine]
system = 'android'
cpu_family = 'x86'
cpu = 'i686'
endian = 'little'


  


• Using FFMPEG in C#

  26 juin 2012, par k_1404

  I am trying to strip audio from a video file using FFMPEG in C#. I know what the code is for doing such an operation (as far as I know) but I am not 100% sure where I need to keep the ffmpe.exe file in my project and how to access it.
  My code so far is as follows :

  public void stripAudioTest(string videoFilename, ExportProgressWindow callback, string destinationAudioFile)
  
      {
  
          string FFMPEG_PATH = "*************"; //not sure what to put here??????
  
  
  
  
  
  
  
          string strParam = " -i " + videoFileName + " -ab 160k -ar 44100 -f wav -vn " +   destinationAudioFile;
  
          process(FFMPEG_PATH, strParam);
  
          callback.Increment(100);
  
  
  
  
  
      }
  
  
  
      public void process(string Path_FFMPEG, string strParam)
  
      {
  
          try
  
          {
  
              Process ffmpeg = new Process();
  
  
  
              ffmpeg.StartInfo.UseShellExecute = false;
  
              ffmpeg.StartInfo.RedirectStandardOutput = true;
  
              ffmpeg.StartInfo.FileName = Path_FFMPEG;
  
              ffmpeg.StartInfo.Arguments = strParam;
  
  
  
              ffmpeg.Start();
  
  
  
              ffmpeg.WaitForExit();
  
  
  
          }
  
          catch (Exception ex)
  
          {
  
              MessageBox.Show(ex.Message);
  
          }
  
      }`

  If anyone has any ideas please let me know. Anything helps !

• build : remove pointless condition

  24 octobre 2013, par Ingo Brückl

  build : remove pointless condition
  $(STRIP) always expands to something, because it is one of the commands
  
  in the BRIEF list. This renders the condition pointless.
  Signed-off-by : Ingo Brückl <ib@wupperonline.de>
  
  Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  

  • [DBH] library.mak