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• How to set header metadata to encoded video ?

  11 juin 2013, par Jona

  I'm encoding some images into an h264 video inside an mp4 container. I'm essentially using the ffmpeg example muxing.c. The thing is I'm trying to set some metadata in the mp4 container such as artist, title, etc...

  I thought using the following would work but it didn't :

  AVDictionary *opts = NULL;
  
  av_dict_set(&opts, "title", "Super Lucky Dude", 0);
  
  av_dict_set(&opts, "author", "Jacky Chan", 0);
  
  av_dict_set(&opts, "album", "Chinese Movie", 0);
  
  av_dict_set(&opts, "year", "05/10/2013", 0);
  
  av_dict_set(&opts, "comment", "This video was created using example app.", 0);
  
  av_dict_set(&opts, "genre", "Action", 0);
  
  
  
  // Write the stream header, if any.
  
  ret = avformat_write_header(oc, &opts);

  After the whole video is created I don't see any metadata written to the video file. Any pointers how to actually do this properly ?

• require —enable-gpl for using the frei0r filter

  13 juin 2013, par Stefano Sabatini

  require —enable-gpl for using the frei0r filter
  frei0r license is GPL.
  Based on a patch by Timothy Gu <timothygu99@gmail.com>.
  See thread :
  
  Subject : [FFmpeg-devel] [PATCH 1/2] LICENSE : Complete GPL’d external libraries list
  
  Date : Thu,  6 Jun 2013 18:55:30 -0700
  

  • [DH] LICENSE
  • [DH] configure

• 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
  
  # ##############################################################################