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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

• 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

• error in ffmpeg when sending image from pipe via php

  12 décembre 2013, par Abdul Ali

  used the following tutorial to send an uploaded image to ffmpeg from php via pipe.

  Image pipe from php to ffmpeg

  however it raises an eror saying that the pipe has invalid data in it.

  pipe:: Invalid data found when processing input

  following is the php code for uploading an image file

  $tempPath = $_FILES['vdofile']['tmp_name'];
  
  
  
  print_r($tempPath);
  
  
  
  $descriptorspec = array(
  
      0 => array("pipe", "r"), // stdin is a pipe that the child will read from
  
      1 => array("pipe", "w"), // stdout is a pipe that the child will write to
  
      2 => array("file", "error-output.txt", "a") // stderr is a file to write to
  
      );
  
  
  
  $img = imagecreatefromjpeg($tempPath);
  
  
  
   $proc = proc_open("ffmpeg image2pipe -i - -y image.jpg", $descriptorspec, $pipes);
  
  
  
   if (is_resource($proc)) {     
  
       /*
  
        * $pipes[0] = write something to command being run
  
        * $pipes[1] = read something from command
  
        * $pipes[2] = error from command 
  
        */
  
         fwrite($pipes[0], $_FILES['vdofile']['tmp_name']);
  
         fclose($pipes[0]);
  
   }
  
   proc_close($proc);
  
  ?>

  and simple html uploading code is as follows :

   <form action="upload.php" method="post" enctype="multipart/form-data">
  
          <input type="file" />
  
  
  
          <input type="submit" value="Upload" />
  
      </form>

  the error file generated is as follows :

      ffmpeg version N-58485-ga12b4bd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 26 2013 22:07:02 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 55.100 / 52. 55.100
  
    libavcodec     55. 44.100 / 55. 44.100
  
    libavformat    55. 21.102 / 55. 21.102
  
    libavdevice    55.  5.101 / 55.  5.101
  
    libavfilter     3. 91.100 /  3. 91.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  pipe:: Invalid data found when processing input

  any assistance will be appreciated.

  **

  EDIT

  **

  the code still produces an error :

      ffmpeg version N-58485-ga12b4bd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 26 2013 22:07:02 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 55.100 / 52. 55.100
  
    libavcodec     55. 44.100 / 55. 44.100
  
    libavformat    55. 21.102 / 55. 21.102
  
    libavdevice    55.  5.101 / 55.  5.101
  
    libavfilter     3. 91.100 /  3. 91.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [image2pipe @ 00000000029ee0a0] Could not find codec parameters for stream 0 (Video: none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  pipe:: could not find codec parameters

  the following ffmpeg comand is called from within php like above :

  ffmpeg -f image2pipe -i - -vcodec mjpeg -vframes 1 -an -f mjpeg image.mp4