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The build script is to be fixed.
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Right now it assumes that 32-bit MinGW is in the system path and
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64-bit mingw is installed to c:\Apps\MinGW64.
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It is important that gcc is used, not g++!
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Otherwise the produced DLL will likely be dependent on libgcc_s_dw2-1.dll or similar DLL.
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While we want to make the DLLs with minimum dependencies: Win32 libraries + msvcrt.dll.
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ffopencv.c is really a C++ source, hence -x c++ is used.
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How to update opencv_ffmpeg.dll and opencv_ffmpeg_64.dll when a new version of FFMPEG is release?
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1. Install 32-bit MinGW + MSYS from
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http://sourceforge.net/projects/mingw/files/Automated%20MinGW%20Installer/mingw-get-inst/
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Let's assume, it's installed in C:\MSYS32.
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2. Install 64-bit MinGW. http://mingw-w64.sourceforge.net/
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Let's assume, it's installed in C:\MSYS64
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3. Copy C:\MSYS32\msys to C:\MSYS64\msys. Edit C:\MSYS64\msys\etc\fstab, change C:\MSYS32 to C:\MSYS64.
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4. Now you have working MSYS32 and MSYS64 environments.
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Launch, one by one, C:\MSYS32\msys\msys.bat and C:\MSYS64\msys\msys.bat to create your home directories.
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4. Download ffmpeg-x.y.z.tar.gz (where x.y.z denotes the actual ffmpeg version).
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Copy it to C:\MSYS{32|64}\msys\home\<loginname> directory.
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5. To build 32-bit ffmpeg libraries, run C:\MSYS32\msys\msys.bat and type the following commands:
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5.1. tar -xzf ffmpeg-x.y.z.tar.gz
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5.2. mkdir build
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5.3. cd build
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5.4. ../ffmpeg-x.y.z/configure --enable-w32threads
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5.5. make
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5.6. make install
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5.7. cd /local/lib
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5.8. strip -g *.a
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6. Then repeat the same for 64-bit case. The output libs: libavcodec.a etc. need to be renamed to libavcodec64.a etc.
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7. Then, copy all those libs to <opencv>\3rdparty\lib\, copy the headers to <opencv>\3rdparty\include\ffmpeg_.
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8. Then, go to <opencv>\3rdparty\ffmpeg, edit make.bat
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(change paths to the actual paths to your msys32 and msys64 distributions) and then run make.bat
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