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• Linking VLC build to ffmpeg build libraries

  14 mars 2017, par gatorface

  I’m receiving the following error message when attempting to build VLC :

  checking for mad_bit_init in -lmad... yes
checking for MPG123... yes
checking for libavutil variant... libav
checking for GST_APP... yes
checking for GST_VIDEO... yes
checking for AVCODEC... no
configure: error: Requested 'libavcodec >= 57.16.0' but version of libavcodec is 56.1.0. Pass --disable-avcodec to ignore this error.

  I am running the command (first step of Configuration from link below, I did the contrib method and built everything else as well) :

  ./configure

  So let’s get the obvious out of the way : I’m missing the most recent version of libavcodec (v57). Using --disable-avcodec is not a viable solution. Doing a quick apt-file search libavcodec I’m seeing that for debian/jessie the latest version published is libavcodec56, not 57. I did also notice that libavcodec57 was available for installation with ffmpeg here https://ffmpeg.org/download.html

  I actually needed to also build ffmpeg from source. So I did that, worked my way through the dependencies without too much trouble using the guide linked to below.

  So here is my issue : After building and doing a make install of ffmpeg, I still get that error above, despite having the latest libavcodec freshly compiled.

  So my question is : since I used that guide, I am still getting the error when building vlc. I see that the lib exists her : /root/ffmpeg_build/lib/libavcodec.a, and I figured make install would put it where it needs to be. Is there some other compile flag I can set while compiling vlc to point it to that lib directory to look for libavcodec ?

  ffmpeg build : https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
  vlc build : https://wiki.videolan.org/UnixCompile/

  ---

  UPDATE : tried this, still getting the error message : PKG_CONFIG_PATH="/root/ffmpeg_build/lib:$PKG_CONFIG_PATH" LD_LIBRARY_PATH="/root/ffmpeg_build/lib:$LD_LIBRARY_PATH" ./configure

  ---

  UPDATE2 : tried this, still getting the error message : ./configure --libdir="/root/ffmpeg_build/lib:$LIBDIR"

  ---

  UPDATE3 : I tried merging my ffmpeg libs into my vlc libs and may have made things worse. My ffmpeg libs lived here : /root/ffmpeg_build/lib
  My vlc build (contrib builds as well) lived here : /opt/vlc/

  So I merged them with my existing vlc contrib lib :

  cp /root/ffmpeg_build/lib/* /opt/vlc/contrib/x86_64-linux-gnu/lib/
cp /root/ffmpeg_build/lib/pkgconfig/* /opt/vlc/contrib/x86_64-linux-gnu/lib/pkgconfig/

  Then ran configure :
  ./configure --with-contrib=contrib/x86_64-linux-gnu

  Which finally worked, but now I get this error when I try to make :

  Now I get the error :
  /usr/bin/ld: /opt/vlc/contrib/x86_64-linux-gnu/lib/libavformat.a(allformats.o): relocation R_X86_64_32 against `ff_a64_muxer' can not be used when making a shared object; recompile with -fPIC

• avutil : add P016 pixel format

  20 novembre 2016, par Philip Langdale

  avutil : add P016 pixel format
  P016 is the 16-bit variant of NV12 (planar luma, packed chroma), using
  
  two bytes per component.
  It may, and in fact is most likely to, be used in situations where
  
  there are less than 16 bits of data. It is the responsibility of
  
  the writer to zero out any unused LSBs.
  

  • [DH] libavutil/pixdesc.c
  • [DH] libavutil/pixfmt.h
  • [DH] libavutil/version.h

• vp8/armv6 : mc : avoid boolean expression in calculation

  9 juillet 2016, par Janne Grunau

  vp8/armv6 : mc : avoid boolean expression in calculation
  GNU as evaluates true as ’-1’ while Apple’s variant and llvm’s internal
  
  assembler evaluate it as ’1’. The best way to avoid this madness is to
  
  eliminate boolean expressions instead of trying to fix it with
  
  preprocessor directives. Use a direct formula to calculate the
  
  required temporary space on the stack in
  
  ff_put_vp8_epel,bilin4,8,16_h[246]v[246]_armv6().
  Fixes a checkasm segfault in vp8dsp.mc when using llvm’s internal
  
  assembler for a non-Apple target.
  

  • [DBH] libavcodec/arm/vp8dsp_armv6.S