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• FFMpeg compilation error "Undefined symbols for architecture x86_64"

  23 décembre 2011, par Saptarshi Biswas

  I am trying to compile ffmpeg (0.9.0.git) with x264(0.120) like this

  ./configure --enable-gpl --enable-libmp3lame \
  
     --enable-static --disable-shared --enable-libx264 \
  
     --enable-pthreads --disable-doc --enable-avfilter \
  
     --disable-ffplay --disable-ffserver --disable-ffprobe
  
  make

  and I encounter the following error :

  LD  ffmpeg_g
  
  Undefined symbols for architecture x86_64:
  
    "_MM_FIX_0_707106781", referenced from:
  
        _filter in libavfilter.a(vf_fspp.o)
  
    "_MM_FIX_0_541196100", referenced from:
  
        _filter in libavfilter.a(vf_fspp.o)
  
  ld: symbol(s) not found for architecture x86_64
  
  collect2: ld returned 1 exit status
  
  make: *** [ffmpeg_g] Error 1

  Any idea what the fix might be ?

  Update : Might be unrelated but this discussion https://trac.macports.org/ticket/30093 says the issue was ffmpeg picking up llvm instead of gcc-4.2 but then this had already fixed in 0.7.4

• Parsing the STDERR output of node.js child_process line by line

  3 janvier 2012, par primer

  I'm writing a simple online conversion tool using FFMPEG and Node.js. I'm trying to figure out how to parse each line of the conversion output received from FFMPEG and only display pertinent results client side in the browser. In my case I want the encoding time counter that FFMPEG spits out on the command line.

  My function thus far is :

  function metric(ffmpeg, res) { 
  
  
  
    ffmpeg.stdout.on('data', function(data) {
  
       res.writeHead(200, {'content-type': 'text/html'});
  
       res.write('received upload:\n\n');
  
       console.log(data);
  
    });
  
  
  
    ffmpeg.stderr.on('data', function (data) {
  
       var temp += data.toString();
  
              var lines = temp.split('\n');
  
  
  
              //for debugging purposes
  
              for(var i = 0;icode>

  What this ends up returning is multiple arrays, each of which includes the data from the previous array as well as the next data chunk. For example, the function returns array 1 :0=>A, 1=>B, array 2 :0=>A, 1=>B, 2=>C, array 3 :0=>A, 1=>B, 2=>C, 3=>D, and so on.

  I'm quite new to Node so I'm probably missing something simple. Any guidance would be much appreciated !

• undefined reference to `__stack_chk_guard'

  20 décembre 2011, par moose

  I'm trying to debug the ffmpeg (0.8.7) on x86 Windows OS.
  When I run configure with the -fstack-protector-all and -fstack-check I get this in config.log :

  gcc -mms-bitfields -fstack-protector-all -fstack-check -I/home/moose/x264 -c -o /tmp/ffconf.AZMYgppf.o /tmp/ffconf.NLPWVejs.c
  gcc -Wl,—add-stdcall-alias -L/c/installs/x264/x264-snapshot-20111206-2245 -o /tmp/ffconf.ZgseLpWd.exe /tmp/ffconf.AZMYgppf.o /c/installs/x264/x264-snapshot-20111206-2245/libx264.a
  C :/DOCUME 1/moose/LOCALS 1/Temp/ffconf.AZMYgppf.o:ffconf.NLPWVejs.c :(.text+0x2f) : undefined reference to

  __stack_chk_guard'
C:/DOCUME~1/moose/LOCALS~1/Temp/ffconf.AZMYgppf.o:ffconf.NLPWVejs.c:(.text+0x44): undefined reference to

  __stack_chk_guard'
  C :/DOCUME 1/moose/LOCALS 1/Temp/ffconf.AZMYgppf.o:ffconf.NLPWVejs.c :(.text+0x4b) : undefined reference to `__stack_chk_fail'
  collect2 : ld returned 1 exit status
  C compiler test failed.

  Where did I fail ?

  EDIT :
  I can't answer my own question, so I'll add the comment here :

  Solved.. I had to link it against the libssp.a
  However, there is no change with these two swiches (-fstack-protector-all and -fstack-check ) at all :-(