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• How to add Qt to an existing C program and compile ?

  26 juin 2015, par El Sampsa

  I have a small Qt program I have compiled with qmake and make. When I launch make, I get the following commands for compilation :

  g++ -c -m64 -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++-64 -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I/usr/lib/x86_64-linux-gnu -I/usr/include/SDL -I. -o simpleqt.o simpleqt.cpp

  (.. lets call that (**)) and

  g++ -m64 -Wl,-O1 -o qt simpleqt.o -L/usr/lib/x86_64-linux-gnu -lSDL -lX11 -lQtGui -lQtCore -lpthread

  .. and the program is compiled without problems.

  On the other hand, I have the ffmpeg library which has the "ffplay" program. I want to put some Qt things into ffplay. In the ffmpeg config files I tell to the make process (using "common.mak") that it should be verbose and when issuing "make ffplay", it gives me the following monster :

  gcc -I. -I./ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DZLIB_CONST -I/home/sampsa/ffmpeg/build/include -std=c99 -fomit-frame-pointer -pthread -I/usr/include/freetype2 -I/usr/include/fribidi -I/usr/include/freetype2 -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/SDL -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -Wno-maybe-uninitialized -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/SDL -MMD -MF ffplay.d -MT ffplay.o -c -o ffplay.o ffplay.c

  (lets call that monster (++)).

  So far, so good, I have two commands, one (**) for compiling Qt programs and another one (++) for another project (in this case, ffmpeg’s ffplay)

  How do I combine these two ?

  I have tried merging the flags in (**) into command (++). It compiles OK, but the moment I am adding

  #include <qtgui> 
  
  </qtgui>

  into "ffplay.c", all hell breaks loose and the compiler tells me (among many other things) :

  In file included from /usr/include/qt4/QtCore/qobjectdefs.h:45:0,
  from /usr/include/qt4/QtCore/qobject.h:47,
  from /usr/include/qt4/QtCore/qabstracteventdispatcher.h:45,
  from /usr/include/qt4/QtCore/QtCore:3,
  from /usr/include/qt4/QtGui/QtGui:3,
  from ffplay2.c:61 :
  /usr/include/qt4/QtCore/qnamespace.h:51:1 : warning : return type defaults to ‘int’ [enabled by default]
  QT_MODULE(Core)
  ^
  /usr/include/qt4/QtCore/qnamespace.h:51:1 : warning : function declaration isn’t a prototype [-Wstrict-prototypes]
  /usr/include/qt4/QtCore/qnamespace.h : In function ‘QT_MODULE’ :
  /usr/include/qt4/QtCore/qnamespace.h:54:1 : error : unknown type name ‘namespace’
  namespace
  ^
  ...
  ...

  If I combine flags in (**) to (++) and change the compiler from "gcc" to "g++", I get all kinds of errors, this time related to the "ffplay.c" source code.

  What is going on ?

• How to salvage a gigantic, possibly corrupt, AIFF file ?

  12 février 2012, par Ross Duncan

  Due to a Sound Track Pro glitch, I have a problematic AIF file. It plays fine in QuickTime Player, and is about 1 hour 50 mins long. However :

  • It's 3.81GB in size, whereas (I believe) AIF files are only supposed to be 2GB or smaller.
  • iTunes refuses to play it.
  • Logic Pro gives the error message "party-mix.aif is empty!" when I try to import it.
  • VLC will open and play the file, but it ends after an 1 hour (I guess this is the 2GB point).

  • Attempting to transcode using ffmpeg to Ogg gives the errors,

    [aiff @ 0x102051000] max_analyze_duration 5000000 reached at 5001333

    ....

    [pcm_s16be @ 0x10205a200] invalid PCM packet

    but the resulting file plays in VLC up till 1 hour, when it ends.

  • Attempting to transcode using ffmpeg to MP3 gives similar results as Ogg, except that the number of channels must reduced from 6 to 2. This is odd because it was a stereo project - where the extra 4 channels came from I have no idea.
  • There are a few places where the audio has been very noticeably sped up.

  My question : how can I transcode this frankenstein monster to MP3 without losing the second half ? I am running Mac OS 10.6.8.

• Museum of Multimedia Software, Part 2

  16 août 2010, par Multimedia Mike — Software Museum

  This installment includes a bunch of old, discontinued Adobe software as well as some Flash-related mutlimedia software.

  Screen Time for Flash Screen Saver Factory
  "Create High Impact Screen Savers Using Macromedia Flash."

  
  
  

  Requirements include Windows 3.1, 95 or NT 3.5.1. A 486 computer is required to play the resulting screensavers which are Flash projectors using Macromedia Flash 3.0.

  Monster Interactive Instant GUI 2
  Create eye-popping GUIs more easily for use in Flash. Usability experts would argue that this is not a good thing.

  
  
  

  Adobe Dimensions 3.0
  "The Easy Yet Powerful 3D Rendering Tool." This software was end-of-life’d in late 2004-early 2005 (depending on region).

  
  
  

  Adobe ImageStyler
  "Instantly add style to your Web site." Wikipedia claims that this product was sold from 1998 to 2000 when it was superseded by Adobe LiveMotion (see below).

  
  
  

  Google is able to excavate a link to the Latin American site for Adobe ImageStyler, a page that doesn’t seem to be replicated in any other language.

  Adobe LiveMotion
  "Professional Web graphics and animation." This is version 1, where the last version was #2, released in 2002.

  
  
  

  Adobe Streamline 4.0
  "The most powerful way to convert images into line art." This was discontinued in mid-2005.

  
  
  

  Adobe SuperATM
  "The magic that maintains the look of your documents." This is the oldest item in my collection. A close examination of the back of the box reveals an old Adobe logo. The latest copyright date on the box is 1992.