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• FFMPEG get_buffer2 multi-thread random crash

  4 novembre 2015, par arnaud

  I’m doing a multi-thread FFMPEG video player. Basically it decodes and display 16 MP4 video files ( using h264 codec ) at the same time, using my own threads / jobs subsystem.
  For future extension I want to provide my own memory buffer for AVFrame decoding. To do this, I simply used get_buffer2 hook method. My get_buffer2 handles currently only use av_malloc & av_free (to validate everything is working ). Here is my handler :

  void our_buffer_default_free(void *opaque, uint8_t *data)
  
  {
  
      av_free(data);
  
  }
  
  
  
  int our_get_buffer(struct AVCodecContext *c, AVFrame *pic, int flags)
  
  {
  
      assert(c->codec_type == AVMEDIA_TYPE_VIDEO);
  
  
  
      pic->linesize[0] = pic->width;
  
      pic->linesize[1] = pic->width/2;
  
      pic->linesize[2] = pic->width/2;
  
  
  
      void* pYBuffer = av_malloc(pic->linesize[0] * pic->height);
  
      void* pUBuffer = av_malloc(pic->linesize[1] * pic->height / 2);
  
      void* pVBuffer = av_malloc(pic->linesize[2] * pic->height / 2);
  
      assert(pYBuffer);
  
      assert(pUBuffer);
  
      assert(pVBuffer);
  
  
  
      pic->data[0] = (uint8_t*)pYBuffer;
  
      pic->data[1] = (uint8_t*)pUBuffer;
  
      pic->data[2] = (uint8_t*)pVBuffer;
  
      pic->buf[0] = av_buffer_create(pic->data[0], pic->linesize[0] * pic->height, our_buffer_default_free, NULL, 0);
  
      pic->buf[1] = av_buffer_create(pic->data[1], pic->linesize[1] * pic->height / 2, our_buffer_default_free, NULL, 0);
  
      pic->buf[2] = av_buffer_create(pic->data[2], pic->linesize[2] * pic->height / 2, our_buffer_default_free, NULL, 0);
  
      return 0;
  
  }

  • If I don’t hook get_buffer2 (keep ffmpeg use its own AVFrame memory allocation) and activate my multithread job system, everything is running ok ( no crash)
  • If I hook get_buffer2 with the code provided and multi-thread activated, I get some random crashs ( after few seconds or minutes, random )
  • If I hook get_buffer2 without multi-thread activated, everything is running ok (no crash)

  So it seems the way I hook "get_buffer2" is not thread safe, but I just don’t see why. ( I guess av_malloc & av_free are threadsafe on windows platform)

  Any idea ?

  PS : I don’t have many details on the crash because I’m using a pre-compiled FFMPEG. It often crash in avcodec57.dll. I’m using windows 64bits system, my app & FMMPEG binaries are both 32bits. Details about FFMPEG version used :

  Zeranoe's FFmpeg Builds Home Page: /ffmpeg.zeranoe.com/builds/>
  
  
  
  FFmpeg version: 20151103-git-6df2c94
  
    libavutil      54. 30.100 / 54. 30.100
  
    libavcodec     56. 57.100 / 56. 57.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 32.100 /  5. 32.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100

• I can't install ffmpegs (dependencies) - error with doxygen [mac 10.12.6 Sierra]

  12 septembre 2022, par Lo-Fi Junky

  It installed about 70% of the dependencies it needed to get ffmpegs going, but it got stuck at installing 'doxygen'.

  


  This is the error I got :

  


  ==> Installing dependencies for ffmpeg: doxygen, little-cms2, openjpeg, opus, rust, libgit2, cargo-c, rav1e, flac, libsndfile, libsamplerate, rubberband, sdl2, swig, llvm, snappy, speex, srt, leptonica, libb2, lz4, libarchive, tesseract, theora, x264, x265, xvid, docbook, boost, source-highlight, asciidoc, docbook-xsl, libyaml, ruby, asciidoctor, gnu-getopt, xmlto, libsodium, zeromq and zimg&#xA;==> Installing ffmpeg dependency: doxygen&#xA;==> cmake ..&#xA;==> make&#xA;Last 15 lines from /Users/macbook/Library/Logs/Homebrew/doxygen/02.make:&#xA;In file included from /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/src/outputlist.h:25:&#xA;/tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/src/searchindex.h:29:10: fatal error: &#x27;variant&#x27; file not found&#xA;#include <variant>&#xA;         ^~~~~~~~~&#xA;1 error generated.&#xA;make[2]: *** [src/CMakeFiles/doxymain.dir/__/generated_src/code.cpp.o] Error 1&#xA;make[1]: *** [src/CMakeFiles/doxymain.dir/all] Error 2&#xA;make[1]: *** Waiting for unfinished jobs....&#xA;[ 46%] Linking CXX static library ../lib/libvhdlparser.a&#xA;cd /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/build/vhdlparser &amp;&amp; /usr/local/Cellar/cmake/3.23.2/bin/cmake -P CMakeFiles/vhdlparser.dir/cmake_clean_target.cmake&#xA;cd /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/build/vhdlparser &amp;&amp; /usr/local/Cellar/cmake/3.23.2/bin/cmake -E cmake_link_script CMakeFiles/vhdlparser.dir/link.txt --verbose=1&#xA;/usr/bin/ar qc ../lib/libvhdlparser.a CMakeFiles/vhdlparser.dir/CharStream.cc.o CMakeFiles/vhdlparser.dir/ParseException.cc.o CMakeFiles/vhdlparser.dir/Token.cc.o CMakeFiles/vhdlparser.dir/TokenMgrError.cc.o CMakeFiles/vhdlparser.dir/__/generated_src/VhdlParser_adj.cc.o CMakeFiles/vhdlparser.dir/VhdlParserTokenManager.cc.o&#xA;/usr/bin/ranlib ../lib/libvhdlparser.a&#xA;[ 46%] Built target vhdlparser&#xA;make: *** [all] Error 2&#xA;&#xA;Do not report this issue to Homebrew/brew or Homebrew/core!&#xA;&#xA;&#xA;Error: You are using macOS 10.12.&#xA;We (and Apple) do not provide support for this old version.&#xA;You will encounter build failures with some formulae.&#xA;Please create pull requests instead of asking for help on Homebrew&#x27;s GitHub,&#xA;Twitter or any other official channels. You are responsible for resolving&#xA;any issues you experience while you are running this&#xA;old version.&#xA;</variant>

  


  Can someone please help me am not sure what it is, that I am supposed to do.

  


• php_ffmpeg some error and solutions

  26 mars 2018, par sonam Sharma

  I have successfully installed php_ffmpeg in my new project with the help of a guy on stackoverflow.com.
  I can do the basic jobs like extracting a frame out of a video
  but when I try to convert the video to another format I get this error :

  Fatal error : Uncaught exception ’Alchemy\BinaryDriver\Exception\ExecutionFailureException’
  with message ’ffprobe failed to execute command "C :\ffmpeg\bin\ffprobe.EXE"
  "sample3.mp4" "-show_streams" "-print_format" "json"’ in
  C :\wamp\www\raidpipe\vendor\php-ffmpeg\php-ffmpeg\src\FFMpeg\FFProbe.php on line 244

  Alchemy\BinaryDriver\Exception\ExecutionFailureException :
  ffprobe failed to execute command "C :\ffmpeg\bin\ffprobe.EXE"
  "sample3.mp4" "-show_streams" "-print_format" "json" in
  C :\wamp\www\raidpipe\vendor\alchemy\binary-
  driver\src\Alchemy\BinaryDriver\ProcessRunner.php on line 100

  FFMpeg\Exception\RuntimeException :
  Unable to probe sample3.mp4 in
  C :\wamp\www\raidpipe\vendor\php-ffmpeg\php-ffmpeg\src\FFMpeg\FFProbe.php on line 244

  I have used this code in my test page :

   <?php
  
   require 'vendor/autoload.php';
  
   $ffmpeg = FFMpeg\FFMpeg::create();
  
   $video = $ffmpeg->open('test/sample3.mp4');
  
   $video
  
  ->filters()
  
  ->resize(new FFMpeg\Coordinate\Dimension(320, 240))
  
  ->synchronize();
  
    $video
  
  ->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(19))
  
  ->save('test/clip/frame123.jpg');
  
    $video
  
  ->save(new FFMpeg\Format\Video\X264(), 'export-x264.mp4')
  
  ->save(new FFMpeg\Format\Video\WMV(), 'export-wmv.wmv')
  
  ->save(new FFMpeg\Format\Video\WebM(), 'export-webm.webm');
  
   ?>

  When I run this code it gives me the frame without any error

   require 'vendor/autoload.php';
  
    $ffmpeg = FFMpeg\FFMpeg::create();
  
    $video = $ffmpeg->open('test/sample3.mp4');
  
    $video
  
  ->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(19))
  
  ->save('test/clip/frame123.jpg');

  Please suggest me a way to convert the video by using the php_ffmpeg
  i need the video to be converted to some basic formats which can be supported by all the browsers and also please let me know is it a good practice to use exc (execute) in php ??

  I got the above code from this link

    https://github.com/PHP-FFMpeg/PHP-FFMpeg