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Solved -> i adde the avcodec_56.dll and other ffmpeg .dll to my .exe folder and that worked. Thanks a lot for help.
ok finally:
modifying Qt/5.3/clang_64/mkspecs/macx-clang/qmake.conf
this way:
#QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.6 QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
did the job.
just in case anybody needs this again. seems easy afterwards -.-