Clone following git repository using command line like this:

git clone https://github.com/microsoft/vcpkg
cd vcpkg
bootstrap-vcpkg.bat

Determine for which platform you want to build. To see existing platforms - check subfolder triplets.

Detailed information can be found from here: ​https://vcpkg.readthedocs.io/en/latest/users/triplets/

If you wish to build only release build, no debug - then copy x64-windows.cmake to x64-windows-rel.cmake, and add there following text:

set(VCPKG_TARGET_ARCHITECTURE x64)
set(VCPKG_CRT_LINKAGE dynamic)
set(VCPKG_LIBRARY_LINKAGE dynamic)
set(VCPKG_BUILD_TYPE release)

Edit ports\ffmpeg\CONTROL file and change this line:

Default-Features: avresample, avcodec, avformat, avdevice, avfilter, postproc, swresample, swscale

to something you want to build, for example - I wanted to build only ffmpeg with with scaling / resizing support, so I've changed this line to:

Default-Features: ffmpeg, swresample, swscale

After that build ffmpeg using command line like this:

vcpkg install ffmpeg
       - Builds debug and release versions
vcpkg install ffmpeg:x64-windows-rel
       - Builds release only version

You can use also --dry-run to determine that you're making right thing:

>vcpkg install ffmpeg:x64-windows-rel --dry-run
Computing installation plan...
The following packages will be built and installed:
    ffmpeg[avcodec,avfilter,avformat,core,ffmpeg,swresample,swscale]:x64-windows-rel