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• Unresolved externals with statically built ffmpeg on Windows

  7 juillet 2013, par user1764961

  I built ffmpeg 1.2.1 as a static lib - x64, debug. And I tried to open one of my older projects that links against it. After modifying some changed APIs and similar in my source, it compiled fine, but I have major problems with linking.

  EDITED : the complete latest build output :

  1>libavformat.a(mov.o) : error LNK2019: unresolved external symbol __imp__gmtime64 referenced in function mov_read_mvhd
  
  1>libavutil.a(parseutils.o) : error LNK2001: unresolved external symbol __imp__gmtime64
  
  1>libavformat.a(os_support.o) : error LNK2019: unresolved external symbol __imp__wsopen referenced in function ff_win32_open
  
  1>libavcodec.a(pthread.o) : error LNK2019: unresolved external symbol __imp__beginthreadex referenced in function ff_thread_init
  
  1>libavcodec.a(frame_thread_encoder.o) : error LNK2001: unresolved external symbol __imp__beginthreadex
  
  1>libavutil.a(parseutils.o) : error LNK2019: unresolved external symbol __imp__localtime64 referenced in function av_parse_time
  
  1>libavutil.a(parseutils.o) : error LNK2019: unresolved external symbol __imp__time64 referenced in function av_parse_time
  
  1>libavutil.a(parseutils.o) : error LNK2019: unresolved external symbol __imp__mktime64 referenced in function av_parse_time
  
  1>libmingwex.a(lib64_libmingwex_a-mingw_output_format.o) : error LNK2019: unresolved external symbol __mingw_get_msvcrt_handle referenced in function __mingw_set_output_format
  
  1>libmingwex.a(lib64_libmingwex_a-mingw_get_codepage.o) : error LNK2001: unresolved external symbol __mingw_get_msvcrt_handle

  What am I doing wrong ?
  What am I missing here ?
  Does ffmpeg even work today on Windows platform as a static lib, or it becomes less functional on Windows with each new version ?

• How to compile ffmpeg-1.2.1 on windows with cygwin and android ndk r8e

  17 juin 2013, par Pratik

  I have been trying to find the solution from last few days but unfortunately not even found a single solution which provides me the right direction..! I have goggled no of posts,examples etc.Lots of developers are facing the same problem.I know these things are easy to compile on OS X or any Linux.

  so my question is that :

  How to compile ffmpeg-1.2.1 on windows with cygwin and android ndk r8e
  or
  if anybody had successfully complied the previous releases of ff-mpeg on windows they can tell me the necessary steps.

  I am using windows-7(32-bit)

  Downloaded sources :

  1) I have downloaded latest FFmpeg 1.2.1 "Magic" from FFMPEG sources.

  2) I have downloaded all the necessary packages in cygwin.

  3) I have also downloaded android-ndk-r8e from Android dev site.

  I am trying to find the solution but
  any help would be appriciated.

• configure : Don’t explicitly disable PIC for windows targets

  28 mai 2013, par Martin Storsjö

  configure : Don’t explicitly disable PIC for windows targets
  This reverts e08c946c6 and 05165c2f7a. The actual intention of
  
  e08c946c6 was to fix shared library builds for arm/win32, which
  
  can also be accomplished in other ways.
  Disabling pic on those platforms broke inline assembly on cygwin/64
  
  (since some inline assembly requires knowing whether we are building
  
  as PIC or not), and might also break inline assembly on other
  
  compilers on windows.
  As a side-effect, this unfortunately brings back all the warnings
  
  about PIC not having any effect on that platform.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] configure