use vcpkg to build the ffmpeg.

folow the instructions https://trac.ffmpeg.org/wiki/CompilationGuide/vcpkg
run command

vcpkg.exe install ffmpeg[core,avcodec,avdevice,avfilter,avformat,speex,avresample,mp3lame,opus,sdl2,swresample,vorbis]:x64-windows-rel

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 can replace the dlls and libs in the winlibs\lib\msvc

cons: seems lacks libspeex or I just download the wrong package.

pros: easy to manage.

I have tried the following methods 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

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 use it to compile for visual studio .

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