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