can't link ffmpeg 2.7 dev lib and Include folder inside Qt Development

SGaist

Hi and welcome to devnet,

You're missing a -L before C:/ffmpeg/lib so it should be -LC:/ffmpeg/lib

Please note that this forum is community driven and people here are glad to help you sort your problem, but even if you're in a hurry adding !!!URGENGTTTTTTTTTTTTTTT just like that can be considered rude.

If you need urgent and immediate help, you might also consider hiring professional people through e.g. the Qt Company, KDAB, ICS etc.

Atdhe

its still got the errors when i add -L befor than i got a bunch off
C:\Users\atdhe\Documents\storyrecorder\videopreview.cpp:10: error: undefined reference to av_register_all' C:\Users\atdhe\Documents\storyrecorder\videopreview.cpp:80: error: undefined reference to avformat_open_input'
C:\Users\atdhe\Documents\storyrecorder\videopreview.cpp:116: error: undefined reference to avcodec_open2' C:\Users\atdhe\Documents\storyrecorder\videopreview.cpp:126: error: undefined reference to avcodec_alloc_frame'
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and so on......

SGaist

Do you still have the permission error ? Or is it just the symbol missing error ?

Atdhe

only the C:\Users\atdhe\Documents\storyrecorder\videopreview.cpp:80: error: undefined reference
... and so on.

SGaist

What compiler are you using for your project ? Which one was used to build ffmpeg ? Is your project 32 or 64 bit ? What about ffmpeg ?

Atdhe

Compiler->C:\Qt\Tools\mingw492_32\bin\g++.exe
ffmpeg->ffmpeg-2.7-win64-dev
and i am runnig in Windows 8.1 64 bit

SGaist

So you are trying to link a 64bit ffmpeg to a 32bit application. That won't work.

Atdhe

Thank you i found the solution i needed to copy .dll ffmpeg to my .exe folder.

SGaist

And what did you do to solve the compilation error ?

Atdhe

Solved -> i adde the avcodec_56.dll and other ffmpeg .dll to my .exe folder and that worked.
Thanks a lot for help.