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• How is better to use ffmpeg with the ASP.NET Core, on Linux ?

  26 mars, par user8245660

  I've got the project (ASP.NET Core, on Linux) where are the several tasks, which relate to the video converting and extracting frames from the video file.

  



  I thought about the two possible options :

  



  

  1. using ffmpeg console utility

  


  2. using P/Invoke with the libavcodec library and others, which ffmpeg uses

  


  



  The second option is miles harder and may be very impractical, because it reminds me developing the new wrapper/library, instead of using the ready products.

  



  I've done googling, but there aren't well-done projects for the C#/ASP.NET Core on Linux platform. There are some good for C++ and Python, but NOT for the C# on Linux/.NET Core.

  



  I decided to look at the first option, which I suppose would be more easier and practical. But, there are some weak places, which can produce many problems. We understand (I suppose), that using the 1st option, the end-developer shall use the process forking. So, there could be possible problems with the process idle and other possible issues...

  



  I'm asking about your practice, because it's my first experience on Linux platform with the video converting/sampling using C#. I've used the Expression Encoder .NET library on Windows platform, but it's other story and it makes no sense, right now.

  



  May be, there are other options, which I can't see right at the moment. I dislike the 1st option because of possible unhandled exceptions, because ffmpeg with such role becomes the black box for the ASP.NET Core backend.

  


• FFmpeg fails to build : pocketsphinx (implicit declaration of function 'ps_get_in_speech' is invalid in C99)

  12 janvier 2020, par Joy Jin

  I’m building FFmpeg version 4.2.2 on macOS High Sierra 10.13.6. The configuration is :

  configure --enable-gpl --enable-version3 --enable-nonfree --enable-gray --enable-chromaprint --enable-frei0r --enable-gcrypt --enable-gmp --enable-ladspa --enable-libaom --enable-libaribb24 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcelt --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libdavs2 --enable-libdc1394 --enable-libfdk-aac --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libjack --enable-libklvanc --enable-libkvazaar --enable-liblensfun --enable-libmodplug  --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencv --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex  --enable-libsrt --enable-libssh --enable-libtensorflow --enable-libtesseract --enable-libtheora  --enable-libtwolame  --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxavs2 --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libxvid  --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-decklink --enable-libmysofa --enable-openal --enable-opencl --enable-opengl --enable-openssl --enable-pocketsphinx --enable-vapoursynth

  Make gives me the following error :

  CC  libavfilter/af_asr.o
  
  libavfilter/af_asr.c:72:19: error: implicit declaration of function
  
        'ps_get_in_speech' is invalid in C99
  
        [-Werror,-Wimplicit-function-declaration]
  
      have_speech = ps_get_in_speech(s->ps);
  
                    ^
  
  libavfilter/af_asr.c:72:19: warning: this function declaration is not a
  
        prototype [-Wstrict-prototypes]
  
  libavfilter/af_asr.c:77:40: error: too few arguments to function call, expected
  
        3, have 2
  
          speech = ps_get_hyp(s->ps, NULL);
  
                   ~~~~~~~~~~            ^
  
  /opt/local/include/pocketsphinx/pocketsphinx.h:449:1: note: 'ps_get_hyp'
  
        declared here
  
  char const *ps_get_hyp(ps_decoder_t *ps, int32 *out_best_score,
  
  ^
  
  libavfilter/af_asr.c:80:27: error: too few arguments to function call, expected
  
        2, have 1
  
          ps_start_utt(s->ps);
  
          ~~~~~~~~~~~~      ^
  
  /opt/local/include/pocketsphinx/pocketsphinx.h:363:1: note: 'ps_start_utt'
  
        declared here
  
  int ps_start_utt(ps_decoder_t *ps, char const *uttid);
  
  ^
  
  libavfilter/af_asr.c:92:23: error: too few arguments to function call, expected
  
        2, have 1
  
      ps_start_utt(s->ps);
  
      ~~~~~~~~~~~~      ^
  
  /opt/local/include/pocketsphinx/pocketsphinx.h:363:1: note: 'ps_start_utt'
  
        declared here
  
  int ps_start_utt(ps_decoder_t *ps, char const *uttid);
  
  ^
  
  libavfilter/af_asr.c:116:5: error: implicit declaration of function
  
        'ps_default_search_args' is invalid in C99
  
        [-Werror,-Wimplicit-function-declaration]
  
      ps_default_search_args(s->config);
  
      ^
  
  libavfilter/af_asr.c:116:5: warning: this function declaration is not a
  
        prototype [-Wstrict-prototypes]
  
  2 warnings and 5 errors generated.
  
  make: *** [libavfilter/af_asr.o] Error 1

  This issue does not appear if I remove —enable-pocketsphinx from the configure argument.

  I built and installed sphinxbase from the source, and I used macport’s pocketsphinx version because building from source failed. These two issues might be related.

  acmod.c:1037:34: error: too many arguments provided to function-like macro
  
        invocation
  
              acmod->senscr_frame, acmod->n_senone_active);
  
                                   ^
  
  /usr/local/include/sphinxbase/err.h:144:9: note: macro 'E_DEBUG' defined here
  
  #define E_DEBUG(level,x)
  
          ^
  
  acmod.c:1036:5: error: use of undeclared identifier 'E_DEBUG'; did you mean
  
        'ERR_DEBUG'?
  
      E_DEBUG("Frame %d has %d active states\n",
  
      ^~~~~~~
  
      ERR_DEBUG
  
  /usr/local/include/sphinxbase/err.h:149:5: note: 'ERR_DEBUG' declared here
  
      ERR_DEBUG,
  
      ^
  
  acmod.c:1036:5: warning: expression result unused [-Wunused-value]
  
      E_DEBUG("Frame %d has %d active states\n",
  
      ^~~~~~~
  
  acmod.c:1161:17: error: too many arguments provided to function-like macro
  
        invocation
  
                  acmod->n_senone_active);
  
                  ^
  
  /usr/local/include/sphinxbase/err.h:144:9: note: macro 'E_DEBUG' defined here
  
  #define E_DEBUG(level,x)
  
          ^
  
  acmod.c:1160:9: error: use of undeclared identifier 'E_DEBUG'; did you mean
  
        'ERR_DEBUG'?
  
          E_DEBUG("Frame %d has %d active states\n", frame_idx,
  
          ^~~~~~~
  
          ERR_DEBUG
  
  /usr/local/include/sphinxbase/err.h:149:5: note: 'ERR_DEBUG' declared here
  
      ERR_DEBUG,
  
      ^
  
  acmod.c:1160:9: warning: expression result unused [-Wunused-value]
  
          E_DEBUG("Frame %d has %d active states\n", frame_idx,
  
          ^~~~~~~
  
  acmod.c:1303:37: error: too many arguments provided to function-like macro
  
        invocation
  
              acmod->n_senone_active, acmod->output_frame);
  
                                      ^
  
  /usr/local/include/sphinxbase/err.h:144:9: note: macro 'E_DEBUG' defined here
  
  #define E_DEBUG(level,x)
  
          ^
  
  acmod.c:1302:5: error: use of undeclared identifier 'E_DEBUG'; did you mean
  
        'ERR_DEBUG'?
  
      E_DEBUG("acmod_flags2list: %d active in frame %d\n",
  
      ^~~~~~~
  
      ERR_DEBUG
  
  /usr/local/include/sphinxbase/err.h:149:5: note: 'ERR_DEBUG' declared here
  
      ERR_DEBUG,
  
      ^
  
  acmod.c:1302:5: warning: expression result unused [-Wunused-value]
  
      E_DEBUG("acmod_flags2list: %d active in frame %d\n",
  
      ^~~~~~~
  
  3 warnings and 6 errors generated.
  
  make[2]: *** [acmod.lo] Error 1
  
  make[1]: *** [all-recursive] Error 1
  
  make: *** [all-recursive] Error 1

• avfilter/blend : use a per-thread AVExpr

  8 mai 2024, par Marton Balint

  avfilter/blend : use a per-thread AVExpr
  Otherwise expression state is accessed and changed from multiple threads.
  Fixes ticket #10987.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavfilter/blend.h
  • [DH] libavfilter/vf_blend.c