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• symbol(s) not found for architecture x86_64 on Mac when using Qt+opencv+ffmpeg

  20 juillet 2015, par Galaxy

  I’m running a project using Qt+opencv+ffmpeg on Mac, but it comes to an error : symbol(s) not found for architecture x86_64.

  ---

  Part of .pro :

  INCLUDEPATH += /usr/local/include
  
  INCLUDEPATH += /usr/local/include/opencv
  
  INCLUDEPATH += /usr/local/include/opencv2
  
  
  
  LIBS += -L/usr/local/lib -lavformat -lavcodec -lavutil

  ---

  When I use GCC (x86 64bit in /usr/bin) to compile, it shows

  error: symbol(s) not found for architecture x86_64

  When I use Clang (x86 64bit in /usr/bin) to compile, it shows

  error: symbol(s) not found for architecture x86_64
  
  error: linker command failed with exit code 1 (use -v to see invocation)

  ---

  I’m using OS X Yosemite 10.10.4. Does anybody know how to fix it ?

• Architecture of video-based service for mobile phones

  27 juin 2015, par David Azar

  I guess this is more of a conceptual question than a technical one.

  I’m trying to figure out the best way to upload short videos to a server and also be able to download them and watch them on both Android and iOS.

  Lets focus on Android for the moment.

  I’ve done some experiments, and my results have been :

  • I’m able to compress 12-14MB video down to 500KB using FFMPEG lib with pretty good results in quality, but it takes about 12 seconds.

  • Next, im uploading those videos to my Parse backend as ParseFile to store them.

  • Finally, i can download them and watch them with no problem using a VideoView widget.

  Now, for the tests i’ve been running, these are great results. But i want to see if there is a better way to manage and scale all of this.

  My questions are :

  • Is there a better, lighter way to compress video ?

  • Is Parse the right way to go ?

  • How can i stream videos instead of downloading them and storing the on local storage before playing them ? i know this will cause my app to use significant space on disk and i dont want that.

  • How do big companies do this kind of tasks ?

  I’ve heard Amazon S3 is a cool thing for projects like this one, also Google Cloud Platform. I want to understand the best approach before building everything so i can do it the right way and also, provide the absolute best user experience for watching these videos.

• 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.