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• compiling ffmpeg_g.exe on mingw

  21 janvier 2014, par user3219986

  I have compiled ffmpeg from source using MSYS2 & MinGW. The library files : libavcodec.a, libavdvice.a libavfilter.a libavformat.a libavutila libpostproc.a libswresample.a libswscale.a were created successfully after running make and when it proceeds to build ffmpeg_g.exe I am getting lot of undefined references. Using -d option in make I found out that the command passed for building ffmpeg_g is :

  g++ -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,—nxcompat -Wl,—dynamicbase -Wl,—as-needed -Wl,—warn-common-Wl,-rpathlink=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample -o ffmpeg_g.exe ffmpeg_opt.o ffmpeg_filter.o ffmpeg.o cmdutils.o -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -lavicap32 -lpsapi -lole32 -lstrmiids -luuid -lws2_32 -lx264 -lvorbisenc -lvorbis -logg -lopenjpeg -lmp3lame -lbluray -L/mingw32/lib -lass -lm -lharfbuzz -lfontconfig -lexpat -lfreetype -lexpat -lenca -lm -lfribidi -lglib-2.0 -lintl -lws2_32 -lole32 -lwinmm -lshlwapi -lintl -lfreetype -lz -lbz2 -lm -lbz2 -lz -lpsapi -ladvapi32 -lshell32

  The output is given below :

  ffmpeg_opt.o : In function

  new_output_stream':
E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:1036: undefined reference to

  avcodec_get_context_defaults3'
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:1089 : undefined reference to

  av_get_exact_bits_per_sample'
ffmpeg_opt.o: In function

  find_codec_or_die' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:514 : undefined reference to

  avcodec_find_encoder_by_name'
ffmpeg_opt.o: In function

  choose_encoder' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:965 : undefined reference to

  avcodec_find_encoder'
ffmpeg_opt.o: In function

  find_codec_or_die' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:518 : undefined reference to

  avcodec_find_encoder'
E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:514: undefined reference to

  avcodec_find_decoder_by_name'
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:518 : undefined reference to

  avcodec_find_decoder'
ffmpeg_opt.o: In function

  add_input_streams' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:596 : undefined reference to

  av_codec_get_lowres'
ffmpeg_opt.o: In function

  choose_decoder' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:546 : undefined reference to

  avcodec_find_decoder'
ffmpeg_opt.o: In function

  add_input_streams' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:546 : undefined reference to

  avcodec_find_decoder'
ffmpeg_opt.o: In function

  open_input_file' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:872 : undefined reference to

  avcodec_get_class'
ffmpeg_opt.o: In function

  add_input_streams' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:631 : undefined reference to

  avcodec_find_decoder'
E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:595: undefined reference to

  avcodec_find_decoder'
  ........................ so many undefined references followed by :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/mlpdsp.c:64 : undefined reference to

  ff_mlpdsp_init_x86'
libavcodec/libavcodec.a(mpegaudiodsp.o): In function

  ff_mpadsp_init' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/mpegaudiodsp.c:46 : undefined reference to

  ff_mpadsp_init_x86'
libavcodec/libavcodec.a(cavsdsp.o): In function

  ff_cavsdsp_init' :
  E :\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/cavsdsp.c:565 : undefined reference to `ff_cavsdsp_init_x86'
  collect2.exe : error : ld returned 1 exit status

  LD ffmpeg_g.exe
  Reaping losing child 01584DA0 PID 29691080
  Makefile:105 : recipe for target 'ffmpeg_g.exe' failed
  Removing child 01584DA0 PID 29691080 from chain.

  Kindly tell me why the compilation fails.... Thanks in advance

• compiling ffmpeg on msys2 and mingw32— error creating ffmpeg_g.exe

  17 juillet 2014, par arnknr

  I have compiled ffmpeg from source using MSYS2 and MinGW. The library files were created successfully during the compilation and when make utility proceeds to build ffmpeg_g, I am getting lot of undefined references.Kindly tell me why the compilation fails....
  Thanks in advance

  The following library files were generated successfully

  libavcodec.a
  
  libavdvice.a 
  
  libavfilter.a 
  
  libavformat.a 
  
  libavutil.a 
  
  libpostproc.a
  
  libswresample.a
  
  libswscale.a 

  Command passed for compiling ffmpeg_g.exe output taken by using -d option with mke

  g++ -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,--nxcompat -Wl,--dynamicbase -Wl,--as-needed -Wl,--warn-common -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample  -o ffmpeg_g.exe ffmpeg_opt.o ffmpeg_filter.o ffmpeg.o cmdutils.o  -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -lavicap32 -lpsapi -lole32 -lstrmiids -luuid -lws2_32 -lx264 -lvpx -lvpx -lvpx -lvpx -lvorbisenc -lvorbis -logg -lopenjpeg -lmp3lame -lfdk-aac -lfaac -lbluray -L/mingw32/lib -lass -lm -lharfbuzz -lfontconfig -lexpat -lfreetype -lexpat -lenca -lm -lfribidi -lglib-2.0 -lintl -lws2_32 -lole32 -lwinmm -lshlwapi -lintl -lfreetype -lz -lbz2 -lm -lbz2 -lz -lpsapi -ladvapi32 -lshell32

  The output from gcc is given below

  ffmpeg_opt.o: In function new_output_stream:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:1036: undefined reference to avcodec_get_context_defaults3
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:1089: undefined reference to av_get_exact_bits_per_sample
  
  ffmpeg_opt.o: In function find_codec_or_die:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:514: undefined reference to avcodec_find_encoder_by_name
  
  ffmpeg_opt.o: In function choose_encoder:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:965: undefined reference to avcodec_find_encoder
  
  ffmpeg_opt.o: In function find_codec_or_die:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:518: undefined reference to avcodec_find_encoder
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:514: undefined reference to avcodec_find_decoder_by_name
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:518: undefined reference to avcodec_find_decoder
  
  ffmpeg_opt.o: In function add_input_streams:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:596: undefined reference to av_codec_get_lowres
  
  ffmpeg_opt.o: In function choose_decoder:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:546: undefined reference to avcodec_find_decoder
  
  ffmpeg_opt.o: In function add_input_streams:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:546: undefined reference to avcodec_find_decoder
  
  ffmpeg_opt.o: In function open_input_file:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:872: undefined reference to avcodec_get_class
  
  ffmpeg_opt.o: In function add_input_streams:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:631: undefined reference to avcodec_find_decoder
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/ffmpeg_opt.c:595: undefined reference to avcodec_find_decoder

  lot of undefined references followed by

  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/mlpdsp.c:64: undefined reference to ff_mlpdsp_init_x86
  
  libavcodec/libavcodec.a(mpegaudiodsp.o): In function ff_mpadsp_init:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/mpegaudiodsp.c:46: undefined reference to ff_mpadsp_init_x86
  
  libavcodec/libavcodec.a(cavsdsp.o): In function ff_cavsdsp_init:
  
  E:\software\pkg\ffmpeg-2.1.3.tar\ffmpeg-2.1.3\ffmpeg-2.1.3/libavcodec/cavsdsp.c:565: undefined reference to ff_cavsdsp_init_x86
  
  collect2.exe: error: ld returned 1 exit status

  Make output

  LD ffmpeg_g.exe
  
  Reaping losing child 01584DA0 PID 29691080 
  
  Makefile:105: recipe for target ffmpeg_g.exe failed
  
  Removing child 01584DA0 PID 29691080 from chain.

• How to programmatically start/stop FFMPEG stream transcoding

  3 février 2014, par Paul Wieland

  I have an ip webcam which provides an MJPEG stream. I can successfully transcode and save that stream with ffmpeg under OSX. The following gives me pretty much what I want :

  ffmpeg -f mjpeg -i "http://user:pass@10.0.1.200/nphMotionJpeg?Resolution=640x480&Quality=Standard" -b:v 1500k -vcodec libx264 /tmp/test.mp4

  That will start an FFMPEG session and begin saving the live stream to my test.mp4 file. pressing q will quit ffmpeg and save the file.

  I would like to programmatically start & stop the recording using a PHP or Bash shell script. I have tried the following :

  <?php
  
  
  
  $pid = pcntl_fork();
  
  
  
  if($pid == -1){
  
      die("could not fork"); 
  
  }elseif($pid){
  
      // we are the parent...
  
      print $pid.' started recording. waiting 10 seconds...';
  
      sleep(10); // Wait 10 seconds
  
  
  
      print_r(shell_exec("kill ".$pid)); // Kill the child recording process
  
  
  
      echo 'done';
  
      exit(); 
  
  }else{
  
      // we are the child process. call ffmpeg.
  
      exec('../lib/ffmpeg -f mjpeg -i "http://user:pass@10.0.1.200/nphMotionJpeg?Resolution=640x480&Quality=Standard" -b:v 1500k -vcodec libx264 /tmp/test.mp4');
  
  }

  But there are two problems :

  1. The ffmpeg process does not end/die (probably because its forked again)
  2. When I manually kill the ffmpeg process, the video file is not readable