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• Link dynamic library and ffmpeg x86_64 version

  24 novembre 2011, par daniel

  I'm working with FFMPEG on Mac OSX, my Mac version is 10.6.8 (i386).

  When I try to compile my C++ code linking a dynamic library :

  g++ sdk.cpp -rpath /usr/local/lib/libinsight.dylib -o sdk

  I get the following error :

  Undefined symbols for architecture x86_64:
  
    "_main", referenced from:
  
      start in crt1.10.6.o
  
    "av_open_input_file(AVFormatContext**, char const*, AVInputFormat*, int,  AVFormatParameters*)", referenced from:
  
      ffmpeg_open(AVFormatContext**, char const*, int*)in ccCkx9dd.o
  
  
  
    (so forth fo every FFMPEG call)
  
  
  
    ld: symbol(s) not found for architecture x86_64
  
    collect2: ld returned 1 exit status

  Without linking dylib I have no problem. What's the matter ?

  P.S. ffmpeg version is Mach-O 64-bit executable x86_64

• Dissappearing characters in youtube-dl, ffmpeg, and windows

  4 juin 2014, par user3407161

  so what happens is that if the video title has a symbol that isn’t supported by your current locale then ffmpeg won’t be able to get to that file properly.

  Here’s one example

  ►2 HOURS BEST MELODIC DUBSTEP MIX APRIL 2013◄ ヽ( ≧ω≦)ﾉ

  as you may or may not be able to see, lots of symbols from unicode.

  The problem is that in cmd and ffmpeg, though cmd can see

  ►2 HOURS BEST MELODIC DUBSTEP MIX APRIL 2013◄ ヽ( ≧ω≦)ﾉ

  ffmpeg only sees

  2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013 ヽ(≧ω≦)ﾉ

  This is the exact error message (i’m using youtube-dl)

  [ffmpeg] Adding metadata to 'C:\Music\ToBeDone\2014-06-01\►2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013◄ ヽ( ≧ω≦)ﾉ.mp4'
  
  ERROR: C:\Music\ToBeDone\2014-06-01\2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013 ヽ(≧ω≦)ﾉ.mp4: No such file or directory
  
  ERROR: WARNING: unable to obtain file audio codec with ffprobe

  After some research i’ve determined that by changing the system locale you can change which symbols cmd can support.

  However

  ヽ

  Used to appear as a box in a question mark in United states locale. In japanese locale it appears as it does on your screen right now.

  the problem with

  ◄

  is that even though it’s not appearing as a question mark in a box (it’s appearing as how it should be), ffmpeg (or cmd) can’t detect it properly.

  (Refer back to the error message, i’ll repost it below.)

  [ffmpeg] Adding metadata to 'C:\Music\ToBeDone\2014-06-01\►2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013◄ ヽ( ≧ω≦)ﾉ.mp4'
  
  ERROR: C:\Music\ToBeDone\2014-06-01\2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013 ヽ(≧ω≦)ﾉ.mp4: No such file or directory
  
  ERROR: WARNING: unable to obtain file audio codec with ffprobe

  So as you can see, I think cmd passed on the symbol correctly to ffmpeg seeing from the adding metadata line, but when it actually does the operation ffmpeg loses

  ► and ◄

  Could this be a bug with ffmpeg ? MY workaround so far with incompatible symbols was to change the system locale, but I don’t think i can do that with these two symbols...

  These are the unique characters that i need to have a locale that supports

  Ö
  
  
  
  ◄ ヽ( ≧ω≦)ﾉ
  
  
  
  ( ͡° ͜ʖ ͡°)
  
  
  
  (_≧∇≦)
  
  
  
  †
  
  
  
  【

  More info on the problem in general

  https://github.com/rg3/youtube-dl/issues/2999

  and this is what’s going on (Batch Script)

  @echo off
  
  setlocal
  
  cd C:\youtube-dl
  
  
  
  set /p "var1=Enter URL: " %=% pause
  
  if defined var1 set "var1=%var1:"=%"
  
  set "var2=%date:/=-%" 
  
  set "var3=%%(title)s.%%(ext)s"
  
  youtube-dl "%var1%" -ci -o "C:\Music\ToBeDone\%var2%\%var3%" -f best -x --no-mtime --add-metadata 
  
  youtube-dl "%var1%" --skip-download -ci -o "C:\Music\ToBeDone\%var2%\Thumbnail\%var3%" --write-   thumbnail
  
  youtube-dl "%var1%" --skip-download -ci -o "C:\Music\ToBeDone\%var2%\Description\%var3%" --write-description

• Can't get simple ffmpeg tutorial to compile on OSX ?

  31 août 2016, par toy

  I’ve installed ffmpeg using homebrew and everything is working fine. Now I’m following the tutorial from http://dranger.com/ffmpeg/

  But I can’t get it to compile on my OSX

  Here’s my code

  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "libavfilter/avfilter.h"
  
  
  
  int main() {
  
    av_register_all();
  
    return 0;
  
  }

  This is how I compile

  gcc ffmpeg-test.cpp -I /usr/local/include 

  I get this error

  Undefined symbols for architecture x86_64:
  
    "av_register_all()", referenced from:
  
        _main in ffmpeg-test-821a45.o
  
  ld: symbol(s) not found for architecture x86_64
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)