윈도우즈 컴파일qtav

error: avutil is required, but compiler can not find it .
You should set some environment vars so that compiler can find FFmpeg and other libraries files.
For VC compiler, they are INCLUDE and LIB. For gcc, they are CPATH and LIBRARY_PATH. e.g.
vc:

set INCLUDE=ffmpeg_path\include;portaudio_path\include;%INCLUDE%
set LIB=ffmpeg_path\lib;portaudio_path\lib;%LIB%

gcc in unix shell environment(including mingw with sh.exe):

export CPATH=ffmpeg_path/include:portaudio_path/include:$CPATH
export LIBRARY_PATH=ffmpeg_path/include:portaudio_path/lib:$LIBRARY_PATH

gcc in windows cmd environment without sh.exe

set CPATH=ffmpeg_path\include;portaudio_path\include;%CPATH%
set LIBRARY_PATH=ffmpeg_path\lib;portaudio_path\lib;%LIBRARY_PATH%

If you are building in QtCreator, goto QtCreator's 'Projects' page and add or append those environment.
I think i should write some documents to show how to build QtAV.
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