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• Libav linking error : undefined references

  22 février 2017, par Fedech

  Here’s my problem :

  • I built ffmpeg from source (version 1.2), the libav* libraries are in /usr/local/lib and they’re static
  • I’m compiling a ns3 (www.nsnam.org) module, so my only control over the linker is through the env variable LINKFLAGS
  • In the source the headers are in a "extern C" block, so it’s not the usual g++ name mangling
  • I set LINKFLAGS="-I/usr/local/include/libavformat -I/usr/local/include/libavcodec -I/usr/local/include/libavutil -L/usr/local/lib -lavformat -lavcodec -lavutil", and the linker can’t seem to find any of the libav* functions I call (I get a lot of "undefined reference" and then "collect2 : error : ld returned status 1"

  Can anyone help me ? Thanks...

  edit : here are a few of the undefined reference messages :

      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_guess_format'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_read_frame'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_write_header'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_interleaved_write_frame'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_find_stream_info'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_register_all'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_init_packet'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_alloc_context'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_dump_format'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avio_close'

  edit2 : here is the message I get after "build failed" :

  -> task in 'scratch-simulator' failed (exit status 1): 
  
  {task 53952272: cxxprogram scratch-simulator.cc.1.o -> scratch-simulator}
  
  ['/usr/bin/g++', '-I/usr/local/include/libavcodec', '-I/usr/local/include/libavformat/',
  
   '-I/usr/local/include/libavutil/', '-L/usr/local/lib', '-I/usr/local
  
  /include/libavcodec', '-I/usr/local/include/libavformat/', '-I/usr/local/include
  
  /libavutil/', '-L/usr/local/lib', '-pthread', '-pthread', '-Wl,-z,relro', 
  
  'scratch/scratch-simulator.cc.1.o', '-o', '/home/fede/Thesis/ns-allinone-3.14.1
  
  /ns-3.14.1/build/scratch/scratch-simulator', '-Wl,-Bstatic', '-Wl,-Bdynamic', 
  
  '-Wl,--no-as-needed', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
  
   '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
  
   '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', 
  
  '-L.', '-L.', '-L.', '-L.', '-L.', '-L/usr/lib', '-lns3.14.1-test-debug', '-lns3.14.1-
  
  csma-layout-debug', '-lns3.14.1-point-to-point-layout-debug', '-lns3.14.1-netanim-
  
  debug', '-lns3.14.1-lte-debug', '-lns3.14.1-spectrum-debug', '-lns3.14.1-antenna-
  
  debug', '-lns3.14.1-aodv-debug', '-lns3.14.1-dsdv-debug', '-lns3.14.1-dsr-debug', 
  
  '-lns3.14.1-mesh-debug', '-lns3.14.1-olsr-debug', '-lns3.14.1-csma-debug', '-lns3.14.1-
  
  wimax-debug', '-lns3.14.1-applications-debug', '-lns3.14.1-virtual-net-device-debug', 
  
  '-lns3.14.1-uan-debug', '-lns3.14.1-energy-debug', '-lns3.14.1-flow-monitor-debug', 
  
  '-lns3.14.1-nix-vector-routing-debug', '-lns3.14.1-tap-bridge-debug', '-lns3.14.1-
  
  visualizer-debug', '-lns3.14.1-internet-debug', '-lns3.14.1-bridge-debug', '-lns3.14.1-
  
  point-to-point-debug', '-lns3.14.1-mpi-debug', '-lns3.14.1-wifi-debug', '-lns3.14.1-
  
  buildings-debug', '-lns3.14.1-propagation-debug', '-lns3.14.1-mobility-debug', 
  
  '-lns3.14.1-config-store-debug', '-lns3.14.1-tools-debug', '-lns3.14.1-stats-debug',
  
   '-lns3.14.1-emu-debug', '-lns3.14.1-topology-read-debug', '-lns3.14.1-network-debug', 
  
  '-lns3.14.1-qoe-monitor-debug', '-lns3.14.1-core-debug', '-lrt', '-lgsl', 
  
  '-lgslcblas', '-lm', '-ldl', '-lgtk-x11-2.0', '-lgdk-x11-2.0', '-latk-1.0', 
  
  '-lgio-2.0', '-lpangoft2-1.0', '-lpangocairo-1.0', '-lgdk_pixbuf-2.0', '-lcairo', 
  
  '-lpango-1.0', '-lfreetype', '-lfontconfig', '-lgobject-2.0', '-lglib-2.0', '-lxml2', 
  
  '-lpython2.7']

• Pseudo-streaming mp4 files does not work with flash player

  11 mai 2013, par faridv

  I've got a problem with streaming audio on my website. I thought I could put the MP3 file inside an MP4 container with h264 codec, so I can use pseudo-streaming ability of mp4 codec.

  The code I'm using to convert my files is :

  ffmpeg -i 1.mp3 -y -b:a 32K -vn 1.mp4

  Pseudo-streaming (seeking in not-loaded parts of media) now works in HTML5 player but not in any Flash media players such as JWPlayer or FlowPlayer.

  I've tested my files on both Apache server with h264 module enabled and Nginx with mod_mp4 enabled, but without any lucks.

  I tried MP4Box, QTIndexSwapper and even creating a real video file by mixing of an image loop and my audio file.

  ffmpeg -y -i joojoo.png -i 2.mp3 -vcodec mjpeg havij.mp4
  
  MP4Box -add havij.mp4 -isma havij_new.mp4

  What am I doing wrong ? What can I do to make it work ?

• Révision 21321 : Report de r21320.

  21 avril 2014, par Eric Lupinacci

  Eviter que la mise en exergue du module de langue dans le title et le texte coincide avec un mot du texte.