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• JavaCV on Android : UnsatisfiedLinkError from libjniavdevice.so / dlopen failed cannot locate symbol "av_input_audio_device_next"

  8 septembre 2014, par liorg

  I am trying to work with JavaCV’s FFmpegFrameGrabber on Android 4.4.2 / 4.3.1 .

  Inside the onCreate(...) method I am calling :

  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(path)

  This causes the following runtime error :

  dlopen("/data/app-lib/com.example.testjavacv-1/libjniavdevice.so")
  
  failed: dlopen failed: cannot locate symbol "av_input_audio_device_next"
  
  referenced by "libjniavdevice.so"

  Other (possible) relevant information :

  1) I have included all the JavaCV .so libraries inside the libs/armeabi and libs/x86 folders.

  2) I have given the application permissions to read/write to external storage and access the camera and microphone.

  3) I am NOT statically loading any of the JavaCV native libraries before instantiating FFmpegFrameGrabber. This is because,

  • Some of the libraries cause runtime exceptions when I attempt to load them statically by myself.
  • I get the impression that JavaCV handles it’s own native library loading - for example the error I get ocurrs even though I have not requested to load the jniavdevice.so library and happens only if the ... new FFmpegFrameGrabber(...) ... code is present.

  4) I have taken a look at : https://groups.google.com/forum/# !topic/javacv/bgB5rCv_fVM which seems to address a similar issue, but the suggested solutions don’t seem to work.

  Any help on this issue would be much appreciated,
  Cheers !

• avcodec : export motion vectors in frame side data on demand

  16 juillet 2014, par Clément Bœsch

  avcodec : export motion vectors in frame side data on demand
  The reasoning behind this addition is that various third party
  
  applications are interested in getting some motion information out of a
  
  video "for free" when it is available.
  It was considered to export other information as well (such as the intra
  
  information about the block, or the quantization) but the structure
  
  might have ended up into a half full-generic, half full of codec
  
  specific cruft. If more information is necessary, it should either be
  
  added in the "flags" field of the AVMotionVector structure, or in
  
  another side-data.
  This commit also includes an example exporting them in a CSV stream.
  

  • [DH] .gitignore
  • [DH] configure
  • [DH] doc/APIchanges
  • [DH] doc/Makefile
  • [DH] doc/codecs.texi
  • [DH] doc/examples/Makefile
  • [DH] doc/examples/extract_mvs.c
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/mpegvideo.c
  • [DH] libavcodec/options_table.h
  • [DH] libavutil/Makefile
  • [DH] libavutil/frame.c
  • [DH] libavutil/frame.h
  • [DH] libavutil/motion_vector.h
  • [DH] libavutil/version.h

• ffmpeg error - "error converting wmv to ac3 "

  13 octobre 2014, par yakumo

  hello i have an error

  my line

  ffmpeg -i 00003.track_4352.wav 00003.track_4352.ac3

  and résult

  ffmpeg version 2.1.5 Copyright (c) 2000-2014 the FFmpeg developers
  built on Jul 8 2014 20:44:17 with gcc 4.8.3 (GCC) 20140624 (Red Hat 4.8.3-1)
  configuration : —prefix=/usr —bindir=/usr/bin —datadir=/usr/share/ffmpeg —incdir=/usr/include/ffmpeg —libdir=/usr/lib64 —mandir=/usr/share/man —arch=x86_64 —optflags=’-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong —param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic’ —enable-bzlib —disable-crystalhd —enable-frei0r —enable-gnutls —enable-libass —enable-libcdio —enable-libcelt —enable-libdc1394 —disable-indev=jack —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-openal —enable-libopencv —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvorbis —enable-libv4l2 —enable-libvpx —enable-libx264 —enable-libxvid —enable-x11grab —enable-avfilter —enable-avresample —enable-postproc —enable-pthreads —disable-static —enable-shared —enable-gpl —disable-debug —disable-stripping —shlibdir=/usr/lib64 —enable-runtime-cpudetect
  libavutil 52. 48.101 / 52. 48.101
  libavcodec 55. 39.101 / 55. 39.101
  libavformat 55. 19.104 / 55. 19.104
  libavdevice 55. 5.100 / 55. 5.100
  libavfilter 3. 90.100 / 3. 90.100
  libavresample 1. 1. 0 / 1. 1. 0
  libswscale 2. 5.101 / 2. 5.101
  libswresample 0. 17.104 / 0. 17.104
  libpostproc 52. 3.100 / 52. 3.100
  00003.track_4352.wav : Invalid data found when processing input

  I do not understand this error can you help me I would like to convert this file

  thank you in advance