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• Compiling qt project with use of ffmpeg on x64 system

  5 juin 2013, par Srv19

  I have a qt project that uses some ffmpeg functionality, that i have compiled previously on windows (x86) and ubuntu. However, its x86 binaries do not work correctly on x64 windows machine. I have tried compiling it but have run into a strange problem.

  All ffmpeg functions i use are listed as unresolved exgternals ; and the most pecicular thing is, their names all ahve a leading underscore attached to them (so, avformat_close_input -> _avformat_close_input etc). To be sure, i have downloaded latest ffmpeg libraries for x64 machines and run them through a dependency walker - no leading underscores anywhere.

  How to fix this problem ?

  Here is my .pro file :

  #-------------------------------------------------
  
  #
  
  # Project created by QtCreator 2013-05-17T10:55:01
  
  #
  
  #-------------------------------------------------
  
  
  
  
  
  QT       += core gui
  
  
  
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
  
  
  
  TARGET = LPR_Demo
  
  TEMPLATE = app
  
  # The application version
  
  VERSION = 1.0
  
  
  
  # Define the preprocessor macro to get the application version in our application.
  
  DEFINES += APP_VERSION=\\\"$$VERSION\\\"
  
  SOURCES += main.cpp\
  
          mainwindow.cpp \
  
      imgProcessor.cpp \
  
      qpicturelabel.cpp \
  
      aboutdialog.cpp \
  
      state.cpp \
  
      qt_videoreader.cpp \
  
      roidialog.cpp \
  
      recognitionresult.cpp \
  
      ffmpeg_reader.cpp \
  
      label_videoplayer.cpp
  
  
  
  HEADERS  += mainwindow.h \
  
      imgProcessor.h \
  
      qpicturelabel.h \
  
      aboutdialog.h \
  
      state.h \
  
      qt_videoreader.h \
  
      roidialog.h \
  
      recognitionresult.h \
  
      global.h \
  
      ffmpeg_reader.h \
  
      label_videoplayer.h
  
  
  
  FORMS    += mainwindow.ui \
  
      aboutdialog.ui \
  
      roidialog.ui
  
  LPRDIR = $$PWD/LPR
  
  win32: LIBS += -L$$LPRDIR/bin/ -lliblpr
  
  unix:LIBS += -L$$LPRDIR/bin -lLPR
  
  
  
  INCLUDEPATH += $$LPRDIR/include
  
  
  
  DEPENDPATH += $$LPRDIR/include
  
  
  
  INCLUDEPATH += $$PWD/
  
  DEPENDPATH += $$PWD/
  
  
  
  #OTHER_FILES += \
  
  #    ffmpeg.pri
  
  include(ffmpeg.pri)
  
  #LIBS += -lavformat -lavcodec -lavutil -lswscale
  
  
  
  RESOURCES += \
  
      lpr_Res.qrc
  
  
  
  win32 {
  
  dlls_to_move.path += $$OUT_PWD/bin
  
  
  
  dlls_to_move.files += $$LPRDIR/bin/liblpr.dll
  
  
  
  QTDIR=C:/Qt/4.8.4/
  
  
  
  CONFIG (debug, debug|release) {
  
  
  
  dlls_to_move.files += $$QTDIR/bin/QtCored4.dll \
  
      $$QTDIR/bin/QtGuid4.dll
  
  
  
  }
  
  CONFIG (release, debug|release) {
  
  
  
  dlls_to_move.files += $$QTDIR/bin/QtCore4.dll \
  
      $$QTDIR/bin/QtGui4.dll
  
  }
  
  img_format.path += $$OUT_PWD/bin/imageformats
  
  CONFIG (debug, debug|release) {
  
  
  
  img_format.files += $$QTDIR/plugins/imageformats/qgifd4.dll \
  
      $$QTDIR/plugins/imageformats/qicod4.dll \
  
      $$QTDIR/plugins/imageformats/qjpegd4.dll \
  
      $$QTDIR/plugins/imageformats/qmngd4.dll \
  
      $$QTDIR/plugins/imageformats/qsvgd4.dll \
  
      $$QTDIR/plugins/imageformats/qtgad4.dll \
  
      $$QTDIR/plugins/imageformats/qtiffd4.dll
  
  
  
  }
  
  CONFIG (release, debug|release) {
  
  
  
  img_format.files += $$QTDIR/plugins/imageformats/qgif4.dll \
  
      $$QTDIR/plugins/imageformats/qico4.dll \
  
      $$QTDIR/plugins/imageformats/qjpeg4.dll \
  
      $$QTDIR/plugins/imageformats/qmng4.dll \
  
      $$QTDIR/plugins/imageformats/qsvg4.dll \
  
      $$QTDIR/plugins/imageformats/qtga4.dll \
  
      $$QTDIR/plugins/imageformats/qtiff4.dll
  
  }
  
  
  
  ffmpeg_dll.path += $$OUT_PWD/bin
  
  
  
  ffmpeg_dll.files += $$FFMPEG_LIBRARY_PATH/avutil-*.dll \
  
      $$FFMPEG_LIBRARY_PATH/avcodec-*.dll \
  
      $$FFMPEG_LIBRARY_PATH/avformat-*.dll \
  
      $$FFMPEG_LIBRARY_PATH/swscale-*.dll
  
  
  
  main_exe.path += $$OUT_PWD/bin
  
  CONFIG (debug, debug|release) {
  
  
  
  main_exe.files += $$OUT_PWD/debug/LPR_Demo.exe
  
  
  
  }
  
  CONFIG (release, debug|release) {
  
  main_exe.files += $$OUT_PWD/release/LPR_Demo.exe
  
  
  
  }
  
  INSTALLS += dlls_to_move img_format ffmpeg_dll main_exe
  
  }
  
  
  
  unix {
  
  CONFIG (release, debug|release) {
  
      QMAKE_PRE_LINK += rm LPR_Demo_cmpr LPR_Demo$$escape_expand(\n\t)
  
      QMAKE_POST_LINK += upx -9 -oLPR_Demo_cmpr LPR_Demo$$escape_expand(\n\t)
  
      QMAKE_POST_LINK += cp -v -u LPR_Demo_cmpr $$OUT_PWD/../artifacts/examples/qt_demo/bin/unix
  
  }
  
  }

  and here is pri file for ffmpeg :

  # Include the configuration file below in the QT .pro file, and modify the path accordingly.
  
  
  
  
  
  # ##############################################################################
  
  # ##############################################################################
  
  # FFMPEG: START OF CONFIGURATION BELOW ->
  
  # Copy these lines into your own project
  
  # Make sure to set the path variables for:
  
  # 1) ffmpeg_reader,
  
  # 2) FFMPEG include path (i.e. where the directories libavcodec, libavutil, etc. lie),
  
  # 3) the binary FFMPEG libraries (that must be compiled separately).
  
  # Under Linux path 2 and 3 may not need to be set as these are usually in the standard include and lib path.
  
  # Under Windows, path 2 and 3 must be set to the location where you placed the FFMPEG includes and compiled binaries
  
  # Note that the FFMPEG dynamic librairies (i.e. the .dll files) must be in the PATH
  
  # ##############################################################################
  
  # ##############################################################################
  
  
  
  # ##############################################################################
  
  # Modify here: set FFMPEG_LIBRARY_PATH and FFMPEG_INCLUDE_PATH
  
  # ##############################################################################
  
  
  
  # Set FFMPEG_LIBRARY_PATH to point to the directory containing the FFmpeg import libraries (if needed - typically for Windows), i.e. the dll.a files
  
  win32:FFMPEG_LIBRARY_PATH = $$PWD/ffmpeg/lib
  
  
  
  unix: FFMPEG_LIBRARY_PATH = /usr/local/lib
  
  
  
  # Set FFMPEG_INCLUDE_PATH to point to the directory containing the FFMPEG includes (if needed - typically for Windows)
  
  win32:FFMPEG_INCLUDE_PATH = $$PWD/ffmpeg/include
  
  unix:FFMPEG_INCLUDE_PATH = /usr/local/include
  
  # ##############################################################################
  
  # Do not modify: FFMPEG default settings
  
  # ##############################################################################
  
  
  
  
  
  # Set list of required FFmpeg libraries
  
  #unix:LIBS += -L$$FFMPEG_LIBRARY_PATH
  
  unix:LIBS += -lavformat -lavcodec -lavutil -lswscale
  
  # Add the path
  
  win32:LIBS += -L$$FFMPEG_LIBRARY_PATH
  
  win32:LIBS += -lavformat -lavcodec -lavutil -lswscale
  
  INCLUDEPATH += $$FFMPEG_INCLUDE_PATH
  
  
  
  # Requied for some C99 defines
  
  DEFINES += __STDC_CONSTANT_MACROS
  
  
  
  # ##############################################################################
  
  # FFMPEG: END OF CONFIGURATION
  
  # ##############################################################################

• movenc : allow override of "writing application" tag

  3 mars 2014, par John Stebbins

  movenc : allow override of "writing application" tag
  Signed-off-by : Tim Walker <tdskywalker@gmail.com>
  CC : libav-stable@libav.org
  

  • [DH] libavformat/movenc.c

• mlpdec : fix request_channel_layout behavior.

  8 février 2014, par Michael Niedermayer

  mlpdec : fix request_channel_layout behavior.
  When request_channel_layout is 0,
  
  all substreams should be decoded.
  Signed-off-by : Tim Walker <tdskywalker@gmail.com>
  

  • [DH] libavcodec/mlpdec.c