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• Compiling FFMPEG on CentOS DigitalOcean

  29 juillet 2015, par coder_uk

  I set up a DigitalOcean instance running CentOS 6.5 and successfully followed the guide to compile FFMPEG (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos). Hurrah !

  But of course I realised that by default, DigitalOcean creates a root user and so ffmpeg now lives in /root/bin/ffmpeg. Which isn’t ideal because when I want to exec the ffmpeg bin from nginx, I would have to run nginx as root for it to have permission.

  Questions ...

  1) Long-shot, but presumably if I change the owner of the ffmpeg binary to nginx, it still won’t work, because nginx won’t be able to access the /root folder it is in. Correct ?

  2) I could run nginx as root (’user root’). But this seems like a very bad idea. Correct ?

  3) Which leaves me with the option of creating a new user, and then compiling ffmpeg into its home folder. But : which user ? EC2 creates ’ec2-user’, so should I make my own equivalent for DO ? But then won’t I have to run nginx as that user, else I’ll run into the same problem ?

  Or should I compile ffmpeg into the ’nginx’ home folder, if indeed it has one ? Is that how it is supposed to be done ?

  Since compiling ffmpeg takes ages, I don’t want to keep doing it, and the static files all seem very out of date. Thanks

• Linux C Makefile (FFmpeg) undefined reference to `curl_easy_init'

  23 juillet 2015, par hoschi111

  I did some changes to /libavformat/concat.c in the FFmpeg source.
  There I included libcurl.

  Internet says I have to add the following code to ’Makefile’.

  INCLUDE = -I/usr/local/include
  
  LDFLAGS = -L/usr/local/lib
  
  LDLIBS = -lcurl

  That did not work.
  I use this to build FFmpeg :

  make clean && ./configure --prefix=/usr --enable-gpl --enable-libmp3lame --enable-libx264 && make -j 4

  Error :

  /usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/libavformat.a(concat.o): In function `concat_read':
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:151: undefined reference to `curl_easy_init'
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:155: undefined reference to `curl_easy_setopt'
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:156: undefined reference to `curl_easy_perform'
  
  /root/ffmpeg_sources/ffmpeg/libavformat/concat.c:158: undefined reference to `curl_easy_getinfo'

  original Makefile :
  https://github.com/FFmpeg/FFmpeg/blob/master/Makefile

  Can you help me ?

• Revision 3c5256d572 : VP9_LPF_VERTICAL_16_DUAL_SSE2 optimization The vp9_lpf_vertical_16_dual functio

  29 avril 2015, par levytamar82

  Changed Paths :
   Modify /vp9/common/x86/vp9_loopfilter_intrin_sse2.c

  
  
  VP9_LPF_VERTICAL_16_DUAL_SSE2 optimization

  The vp9_lpf_vertical_16_dual function optimized for x86 32bit target. The hot
  code in that function was caused by the call to the transpose8x16.
  The gcc generated assembly created uneeded fills and spills to the stack. By
  interleaving 2 loads and unpack instructions, in addition to hoisting the
  consumer
  instruction closer to the producer instructions, we eliminated most of the fills
  and spills and improve the function-level performance by 17%.
  credit for writing the function as well as finding the root cause goes to Erik
  Niemeyer (erik.a.niemeyer@intel.com)

  Change-Id : I6173cf53956d52918a047d1c53d9a673f952ec46