ffmpeg编译

引用：用 Visual Studio 2019 编译 FFmpeg 简单教程

实际：

1. Visual Studio2017
2. msys2_shell.cmd的修改
   rem Setup proper title and icon
   if “%MSYSTEM%” == “MINGW32” (
   set “CONTITLE=MinGW x32”
   set “CONICON=mingw32.ico”
   call “D:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars32.bat”
   ) else if “%MSYSTEM%” == “MINGW64” (
   set “CONTITLE=MinGW x64”
   set “CONICON=mingw64.ico”
   call “D:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat”
   ) else if “%MSYSTEM%” == “UCRT64” (
   set “CONTITLE=MinGW UCRT x64”
   set “CONICON=ucrt64.ico”
   ) else if “%MSYSTEM%” == “CLANG64” (
   set “CONTITLE=MinGW Clang x64”
   set “CONICON=clang64.ico”
   ) else if “%MSYSTEM%” == “CLANG32” (
   set “CONTITLE=MinGW Clang x32”
   set “CONICON=clang32.ico”
   ) else if “%MSYSTEM%” == “CLANGARM64” (
   set “CONTITLE=MinGW Clang ARM64”
   set “CONICON=clangarm64.ico”
   ) else (
   set “CONTITLE=MSYS2 MSYS”
   set “CONICON=msys2.ico”
   call “D:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat”
   )

最终使用“MSYS2 MSYS”进行编译