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• dirac : add more parse codes from the specifications

  21 janvier 2016, par Rostislav Pehlivanov

  dirac : add more parse codes from the specifications
  The specs define some more overlapping and some rarely used parse codes
  
  which were missing.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/dirac.h
  • [DH] libavcodec/dirac_parser.c

• FFmpeg fade audio to volume

  27 mai 2016, par Marshall House

  I have say 5 segments of audio and i want to set each segment to a specific volume but when i concat the segments i’d like there to be a fade from previous volume to the next volume.

  I see afade filter is for simply fading in/out. I see acrossfade which would more than likely be desirable except that the video the audio will play over will not be cross-faded.

  I’m wondering if this can be done with something like aeval or if there are any good ideas out there.

  Maybe someone can explain this filter function or where to learn about the syntax :

  Fade volume after time 10 with an annihilation period of 5 seconds:
  
  volume='if(lt(t,10),1,max(1-(t-10)/5,0))':eval=frame

• Error during ./configure : libvpx decoder version must be >=0.9.1

  25 août 2016, par bot1131357

  I am trying to build a cross-compile FFmpeg library to be targeted on an arm device, and the ./configure command tells me that libvpx is outdated.

  My version of libvpx is as follows :

  $ pkg-config --modversion vorbis 
  
  1.3.2

  When I run ./configure

  $ ./configure --prefix=/home/test/Dev/build-arm/ffmpeg-armhf/ --enable-cross-compile --cross-prefix=${CCPREFIX} --arch=armhf --target-os=linux --pkg-config-flags="--libs vpx --static --cflags" --enable-shared --enable-libvpx 
  
  ERROR: libvpx decoder version must be >=0.9.1
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.

  My vpx.pc file is located in /usr/share/pkgconfig. Since it’s for a different target (arm), Should I be putting this file somewhere else ? :

  # pkg-config file from libvpx v1.6.0-322-gc325fb7
  
  prefix=/home/test/Dev/build-arm/libvpx
  
  exec_prefix=${prefix}
  
  libdir=${prefix}/lib
  
  includedir=${prefix}/include
  
  
  
  Name: vpx
  
  Description: WebM Project VPx codec implementation
  
  Version: 1.6.0
  
  Requires:
  
  Conflicts:
  
  Libs: -L${libdir} -lvpx -lm
  
  Libs.private: -lm -lpthread
  
  Cflags: -I${includedir}

  In my config.log I see this :

  (...lots of text...)
  
  arm-openwrt-linux-gnueabi-gcc -Werror=missing-prototypes -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -march=armv7-a -std=c99 -fomit-frame-pointer -marm -fPIC -pthread -c -o /tmp/ffconf.cZcBLWc3.o /tmp/ffconf.sWjTIULb.m
  
  arm-openwrt-linux-gnueabi-gcc: /tmp/ffconf.sWjTIULb.m: Objective-C compiler not installed on this system
  
  check_pkg_config vpx >= 0.9.1 vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_vp8_dx
  
  false --exists --print-errors vpx >= 0.9.1
  
  check_lib2 vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_dec_init_ver -lvpx
  
  check_func_headers vpx/vpx_decoder.h vpx/vp8dx.h vpx_codec_dec_init_ver -lvpx
  
  check_ld cc -lvpx
  
  check_cc
  
  BEGIN /tmp/ffconf.gM9G9FSQ.c
  
      1   #include <vpx></vpx>vpx_decoder.h>
  
      2   #include <vpx></vpx>vp8dx.h>
  
      3   long check_vpx_codec_dec_init_ver(void) { return (long) vpx_codec_dec_init_ver; }
  
      4   int main(void) { return 0; }
  
  END /tmp/ffconf.gM9G9FSQ.c
  
  arm-openwrt-linux-gnueabi-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -march=armv7-a -std=c99 -fomit-frame-pointer -marm -fPIC -pthread -c -o /tmp/ffconf.cZcBLWc3.o /tmp/ffconf.gM9G9FSQ.c
  
  /tmp/ffconf.gM9G9FSQ.c:1:29: fatal error: vpx/vpx_decoder.h: No such file or directory
  
  compilation terminated.
  
  ERROR: libvpx decoder version must be >=0.9.1

  It looks like the include and library paths are not provided to the compiler, but I don’t know how I should go around solving that.
  I would really appreciate it if you could offer some guidance.