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• libavutil/thread.h : Fixed g++ build error when ASSERT_LEVEL is greater than 1

  17 avril 2017, par Aaron Levinson

  libavutil/thread.h : Fixed g++ build error when ASSERT_LEVEL is greater than 1
  Purpose : libavutil/thread.h : Fixed g++ build error when ASSERT_LEVEL
  
  is greater than 1.  This is only relevant when thread.h is included by
  
  C++ files.  In this case, the relevant code is only defined if
  
  HAVE_PTHREADS is defined as 1.  Use configure —assert-level=2 to do
  
  so.
  Note : Issue discovered as a result of Coverity build failure.  Cause
  
  of build failure pinpointed by Hendrik Leppkes.
  Comments :
  — libavutil/thread.h : Altered ASSERT_PTHREAD_NORET definition such
  
     that it uses av_make_error_string instead of av_err2str().
  
     av_err2str() uses a "parenthesized type followed by an initializer
  
     list", which is apparently not valid C++.  This issue started
  
     occurring because thread.h is now included by the DeckLink C++
  
     files.  The alteration does the equivalent of what av_err2str()
  
     does, but instead declares the character buffer as a local
  
     variable.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavutil/thread.h

• How to build an ffmpeg-old-version(0.10.4) libraries for ios supporting arm64 architecture ?

  21 mai 2015, par ChihHao

  I’m building the ffmpeg libraries to support arm64 architecture in iOS app. For some reason, I can’t use the newest ffmpeg version. I have to use the very old version ffmpeg(0.10.4)

  After reading all the tutorial of building ffmpeg libraries on the internet, this (https://github.com/kewlbear/FFmpeg-iOS-build-script) script is probably the best script for me. However, I can’t build the arm64 libraries from ffmpeg-0.10.4 by the script, the error message is

  building arm64...

  GNU assembler not found, install gas-preprocessor

  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
  solving the problem.

  What I changed the script are :

  SOURCE="ffmpeg-2.6.3" to SOURCE="ffmpeg-0.10.4"

  ARCHS="arm64 armv7 x86_64 i386" to ARCHS="arm64 armv7"

  DEPLOYMENT_TARGET="6.0" to DEPLOYMENT_TARGET="7.0"

  Any suggestions ? Thanks.

• How to use a framework build of Python with Anaconda

  30 avril 2017, par Addem

  I’m unable to get matplotlib animations to display on a Mac computer. I’ve chased down several attempts at installing ffmpeg but they’ve all failed and I’m starting to wonder if that isn’t the wrong way to solve the problem.

  I found this page http://matplotlib.org/faq/osx_framework.html

  Since I’m running Python from the Spyder app in Anaconda, the section for this seems relevant. It says

  The default python provided in (Ana)Conda is not a framework build.
  However, the Conda developers have made it easy to install a framework
  build in both the main environment and in Conda envs. To use this
  install python.app conda install python.app and use pythonw rather
  than python

  I’m not perfectly clear on what this means, but I opened a terminal, ran conda install python.app and it seemed to work—at least there were no error messages. I could navigate to a folder that contained the file python.app.

  I’m not clear on what it means to "use pythonw" but I navigated to the animation I’m trying to compile and ran $ pythonw anim.py and it gave me an I/O error. I’m not sure if I’m supposed to use pythonw in some other way, or what. If I restart and try to run the code in Spyder I get the same error as before.

  I know that the code works, because I’ve run it on a Linux machine that has ffmpeg and it worked.

  Is there something else I need to do to get a framework build, whatever that means ?