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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 ?

• Video processing with ffmpeg on Windows Azure

  29 août 2014, par alekz

  I am working on the project that needs to process videos that are already stored at the AzureBlob storage.

  The processing itself lookes following

  1. Grab frame with ffMpegFrameGrabber
  2. Draw some elements on top of the frame
  3. save it with the ffMpegFrameRecorder

  basicaly I have working version of this algorithm in Java (using java wrapper over native ffmpeg)

  Now I need to implement that processing with Azure Cloud Services.

  My question is
  What is a good ffmpeg wrapper for .net (console interface is not enough for my scenario) ?
  How to use it in Azure Cloud Service (sorry for noob question, but I am new to Azure) ?

• 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.