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• C Code Using FFmpeg libraries - Compilation Error

  17 août 2013, par Ardatr

  I've been recently trying to compile C code that uses the FFmpeg libraries ; however, the compilation fails due to a reason that I cannot determine.

  The code that I've been trying to compile is the filtering_audio.c file on the Doxygen Documentation website for FFmpeg (I'll provide the link, since the code is too long to quote here) : http://ffmpeg.org/doxygen/trunk/doc_2examples_2filtering_audio_8c-example.html

  I use gcc to compile the code :

      gcc filter.c -lavformat -lavcodec -lavfilter  -lavutil

  And I get the following undefined reference errors :

      /tmp/cc90K2S5.o: In function `init_filters':
  
      filter.c:(.text+0x3e5): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x407): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x42d): undefined reference to `av_opt_set_bin'
  
      filter.c:(.text+0x482): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x4a4): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x4ca): undefined reference to `av_opt_set_bin'
  
      filter.c:(.text+0x51f): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x541): undefined reference to `av_int_list_length_for_size'
  
      filter.c:(.text+0x567): undefined reference to `av_opt_set_bin'
  
      /tmp/cc90K2S5.o: In function `print_frame':
  
      filter.c:(.text+0x76b): undefined reference to `av_frame_get_channel_layout'
  
      /tmp/cc90K2S5.o: In function `main':
  
      filter.c:(.text+0x831): undefined reference to `av_frame_alloc'
  
      filter.c:(.text+0x83d): undefined reference to `av_frame_alloc'
  
      filter.c:(.text+0x9de): undefined reference to `av_buffersrc_add_frame_flags'
  
      filter.c:(.text+0xa16): undefined reference to `av_buffersink_get_frame'
  
      filter.c:(.text+0xa58): undefined reference to `av_frame_unref'
  
      filter.c:(.text+0xab6): undefined reference to `av_frame_free'
  
      filter.c:(.text+0xac5): undefined reference to `av_frame_free'
  
      collect2: error: ld returned 1 exit status

  I understand that the undefined reference error indicates that it wasn't able to find the functions referenced from filtering_audio.c, but this doesn't make sense, since these functions should exist in the FFmpeg libraries.

  Any help is appreciated, thank you !

• vdpau : Add missing #includes to fix standalone header compilation

  4 novembre 2013, par Diego Biurrun

  vdpau : Add missing #includes to fix standalone header compilation
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavcodec/vdpau.h
  • [DBH] libavcodec/vdpau_internal.h

• MXE compilation, openjpeg.h not found error

  19 avril 2021, par HIq

  I am compiling MXE for the cross-compilation of FFmpeg.
I am following the instructions here and after running the make command, the following error occurred :

  


  [build]       proj                   i686-w64-mingw32.static
[done]        proj                   i686-w64-mingw32.static                                  27156 KiB      0m10.026s
[build]       libgeotiff             i686-w64-mingw32.static
[done]        libgeotiff             i686-w64-mingw32.static                                  41492 KiB      0m19.380s
[build]       netcdf                 i686-w64-mingw32.static
[done]        netcdf                 i686-w64-mingw32.static                                  114152 KiB     0m22.519s
[build]       openjpeg               i686-w64-mingw32.static
[done]        openjpeg               i686-w64-mingw32.static                                  38572 KiB      0m9.627s
[build]       spatialite             i686-w64-mingw32.static
[done]        spatialite             i686-w64-mingw32.static                                  380204 KiB     0m58.171s
[build]       gdal                   i686-w64-mingw32.static

Failed to build package gdal for target i686-w64-mingw32.static!
------------------------------------------------------------
checking for nc_open in -lnetcdf... no
configure: JasPer (JPEG2000) support disabled.
configure: error: openjpeg.h not found in /home/hiqbal/mxe/usr/i686-w64-mingw32.static/include/openjpeg-2.0 or /home/hiqbal/mxe/usr/i686-w64-mingw32.static/include/openjpeg-2.1 or /home/hiqbal/mxe/usr/i686-w64-mingw32.static/include/openjpeg-2.2 or /home/hiqbal/mxe/usr/i686-w64-mingw32.static/include/openjpeg-2.3
Makefile:851: recipe for target 'build-only-gdal_i686-w64-mingw32.static' failed
make[1]: *** [build-only-gdal_i686-w64-mingw32.static] Error 1
make[1]: Leaving directory '/home/hiqbal/mxe'
real    0m17.644s
user    0m13.999s
sys 0m1.669s
------------------------------------------------------------
[log]      /home/hiqbal/mxe/log/gdal_i686-w64-mingw32.static

Makefile:851: recipe for target '/home/hiqbal/mxe/usr/i686-w64-mingw32.static/installed/gdal' failed
make: *** [/home/hiqbal/mxe/usr/i686-w64-mingw32.static/installed/gdal] Error 1


  


  It seems that it was unable to find openjpeg.h and searched in folder openjpeg-2.0 to openjpeg-2.3. However, when I checked /mxe/usr/i686-w64-mingw32.static/include/, it contains openjpeg-2.4.

  


  The log for /mxe/log/gdal_i686-w64-mingw32.static is present here.

  


  Please help fix this. Thanks.