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• Integrating ffmpeg with qtcreator on windows

  26 juin 2015, par Mayank Agarwal

  I am making simple application just calling ffmpeg av_register_all in qt project ffmpegexample main.cpp but i am getting the following error :

  main.obj :-1 : error : LNK2019 : unresolved external symbol
  _av_register_all referenced in function _main

  My .pro file is as follows :

  QT       += core
  
  
  
  QT       -= gui
  
  
  
  
  
  QMAKE_CXXFLAGS += -D__STDC_CONSTANT_MACROS
  
  
  
  INCLUDEPATH = -I D:/ffmpeg/dev/include
  
  
  
  LIBS += -LD:/ffmpeg/shared/bin
  
  LIBS += -LD:/ffmpeg/dev/lib
  
  
  
  TARGET = ffmpegexample
  
  CONFIG   += console
  
  CONFIG   -= app_bundle
  
  
  
  TEMPLATE = app
  
  
  
  
  
  SOURCES += main.cpp

  Including the LIBS and DLLs as well as headers from ffmpeg static/dev builds from this location.

  My main file is below :

   #include <qcoreapplication>
  
   extern "C" {
  
   #include <libavutil></libavutil>imgutils.h>
  
   #include <libavutil></libavutil>samplefmt.h>
  
   #include <libavutil></libavutil>timestamp.h>
  
   #include <libavformat></libavformat>avformat.h>
  
   }
  
  
  
   int main(int argc, char *argv[])
  
   {
  
   QCoreApplication a(argc, argv);
  
  
  
   av_register_all();
  
  
  
   return a.exec();
  
   }
  
  </qcoreapplication>

  also run qmake to generate Makefile.debug
  and also copied all the dlls and .libs in folder where project main.cpp is there
  but that also didn’t help
  i am getting error :

  main.obj :-1 : error : LNK2019 : unresolved external symbol
  _av_register_all referenced in function _main File not found main.obj

  Don’t understand why main.obj is not getting generated

  Regards
  Mayank

• Fix —output-prefix with input-files in sub-directories

  29 mai 2018, par orbea

  Fix —output-prefix with input-files in sub-directories
  And make sure to reserve the whole file path when not using —output-prefix.
  Fixes https://sourceforge.net/p/flac/bugs/463/
  
  Signed-off-by : Erik de Castro Lopo <erikd@mega-nerd.com>
  

  • [DH] src/flac/main.c

• FFMpeg Convert to AAC with a multiple stream input file

  20 février 2023, par Anders

  I am trying to add a AAC Audio Stream (Stereo) to a MKV file.
To do this I am first creating a Temp.mkv file which I then combine with the original MKV file. This works fine in most cases but when I am trying to create the Temp.mkv where the original file have multiple audio stream it's not working.

  


  I am doing this (in this example I am going for the 3rd Audio stream to be converted)

  


  -loglevel error -i "Input.mkv" -map 0:a:2 -c:a:2 aac -ac:a:2 2 Temp.mkv


  


  The goal is to have a single AAC audio stream (Stereo) in the Temp.mkv file.
Also the reason I am doing the "Temp.mkv" and not "Temp.aac" is to keep the audio stream metadata.

  


  For some reason I end up with the wrong audio stream (I know this because the language is wrong) and for some reason it's in Vorbis and not AAC.

  


  UPDATE :
If do the 3rd stream it's like this :

  


  Stream #0:3 -> #0:0 (ac3 (native) -> vorbis (libvorbis))


  


  If I do the 1st stream it's like this :

  


  Stream #0:1 -> #0:0 (truehd (native) -> aac (native))