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• tools/python : add script to convert TensorFlow model (.pb) to native model (.model)

  13 juin 2019, par Guo, Yejun

  tools/python : add script to convert TensorFlow model (.pb) to native model (.model)
  For example, given TensorFlow model file espcn.pb,
  
  to generate native model file espcn.model, just run :
  
  python convert.py espcn.pb
  In current implementation, the native model file is generated for
  
  specific dnn network with hard-code python scripts maintained out of ffmpeg.
  
  For example, srcnn network used by vf_sr is generated with
  
  https://github.com/HighVoltageRocknRoll/sr/blob/master/generate_header_and_model.py#L85
  In this patch, the script is designed as a general solution which
  
  converts general TensorFlow model .pb file into .model file. The script
  
  now has some tricky to be compatible with current implemention, will
  
  be refined step by step.
  The script is also added into ffmpeg source tree. It is expected there
  
  will be many more patches and community needs the ownership of it.
  Another technical direction is to do the conversion in c/c++ code within
  
  ffmpeg source tree. While .pb file is organized with protocol buffers,
  
  it is not easy to do such work with tiny c/c++ code, see more discussion
  
  at http://ffmpeg.org/pipermail/ffmpeg-devel/2019-May/244496.html. So,
  
  choose the python script.
  Signed-off-by : Guo, Yejun <yejun.guo@intel.com>
  

  • [DH] .gitignore
  • [DH] tools/python/convert.py
  • [DH] tools/python/convert_from_tensorflow.py

• avformat : add fields to AVProgram/AVStream for PMT change tracking

  18 mai 2018, par Aman Gupta

  avformat : add fields to AVProgram/AVStream for PMT change tracking
  These fields will allow the mpegts demuxer to expose details about
  
  the PMT/program which created the AVProgram and its AVStreams.
  In mpegts, a PMT which advertises streams has a version number
  
  which can be incremented at any time. When the version changes,
  
  the pids which correspond to each of it's streams can also change.
  Since ffmpeg creates a new AVStream per pid by default, an API user
  
  needs the ability to (a) detect when the PMT changed, and (b) tell
  
  which AVStream were added to replace earlier streams.
  This has been a long-standing issue with ffmpeg's handling of mpegts
  
  streams with PMT changes, and I found two related patches in the wild
  
  that attempt to solve the same problem :
  The first is in MythTV's ffmpeg fork, where they added a
  
  void (*streams_changed)(void*) ; to AVFormatContext and call it from
  
  their fork of the mpegts demuxer whenever the PMT changes.
  The second was proposed by XBMC in
  
  https://ffmpeg.org/pipermail/ffmpeg-devel/2012-December/135036.html,
  
  where they created a new AVMEDIA_TYPE_DATA stream with id=0 and
  
  attempted to send packets to it whenever the PMT changed.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  

  • [DH] doc/APIchanges
  • [DH] libavformat/avformat.h
  • [DH] libavformat/utils.c
  • [DH] libavformat/version.h

• Enabling libmp3lame for FFMPEG on elastic beanstalk

  13 octobre 2017, par Adam Sith

  I am trying to enable libmp3lame with FFMPEG in elastic beanstalk (Amazon Redhat Linux machine).

  I am able to successfully install FFMPEG in /ffmpeg.config with the following script :

  # .ebextensions/ffmpeg.config
  
  
  
  packages:
  
    yum:
  
      autoconf: []
  
      automake: []
  
      cmake: []
  
      freetype-devel: []
  
      gcc: []
  
      gcc-c++: []
  
      git: []
  
      libtool: []
  
      make: []
  
      nasm: []
  
      pkgconfig: []
  
      zlib-devel: []
  
  sources:
  
    /usr/local/src: http://ffmpeg.org/releases/ffmpeg-3.2.tar.bz2
  
  commands:
  
    ffmpeg_install:
  
        cwd: /usr/local/src/ffmpeg-3.2
  
        command: sudo ./configure --prefix=/usr && make && make install

  I need to install libmp3lame however. I’ve tried to do this with an --enable-libmp3lame flag and the directions here. The modified script :

  packages:
  
  yum:
  
      autoconf: []
  
      automake: []
  
      cmake: []
  
      freetype-devel: []
  
      gcc: []
  
      gcc-c++: []
  
      git: []
  
      libtool: []
  
      make: []
  
      nasm: []
  
      pkgconfig: []
  
      zlib-devel: []
  
  sources:
  
    /usr/local/src: http://ffmpeg.org/releases/ffmpeg-3.2.tar.bz2
  
  commands:
  
    01-install_libmp3lame:
  
        cwd: /usr/local/src/
  
        command: curl -L -O http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz && tar xzvf lame-3.99.5.tar.gz && cd lame-3.99.5 && ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm && make && make install
  
    02-ffmpeg_install:
  
        cwd: /usr/local/src/ffmpeg-3.2
  
        command: sudo ./configure --enable-libmp3lame && --prefix=/usr && make && make install

  This doesn’t work. Command 01-install_libmp3lame completes. Command 02-ffmpeg_install fails because :

  [2017-10-12T20:55:19.324Z] INFO  [24606] - [Application update app-8fe3-123456_7895@111/AppDeployStage0/EbExtensionPreBuild/Infra-EmbeddedPreBuild/prebuild_3_clover_platform/Command 02-ffmpeg_install] : Activity execution failed, because: ERROR: libmp3lame >= 3.98.3 not found

  I have tried installing libmp3lame in /ffmpeg-3.2 and got the same issue.