goldendict-ng/website/docs/howto/how to build ffmpeg for visual studio.md

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# use vcpkg to build the ffmpeg.
Steps:
1. folow the instructions https://trac.ffmpeg.org/wiki/CompilationGuide/vcpkg
2. run command
```
vcpkg.exe install ffmpeg[core,avcodec,avdevice,avfilter,avformat,speex,avresample,mp3lame,opus,sdl2,swresample,vorbis]:x64-windows-rel
```
3. copy dll and libs in vcpkg\installed\x64-windows-rel to goldendict's winlibs\lib\msvc
**pros**: can be compiled with speex.
# alternative Method
just download the ffmpeg from official website: https://github.com/BtbN/FFmpeg-Builds/releases
then replace the dlls and libs in the winlibs\lib\msvc
**cons**: seems lack libspeex or I just download the wrong package.
**pros**: easy to manage.
# I have tried the following methods with no luck
## use the scripts provided by the following url
https://github.com/Microsoft/FFmpegInterop/issues/67
https://github.com/Microsoft/FFmpegInterop
did not know how to link with libspeex.
## conan
conan seems has not included libspeex option up to now.
# links worth checking
https://stackoverflow.com/a/44556505/968188
# notes(deprecated)
winlib/scripts/ffmpeg-configure-mingw32.sh is the script provided by goldendict .
though I have compiled it wiht mingw32 ,I do not know how to compile it for visual studio .