ffmpeg is available at powershell, and i've got these files, with D:\PATH is in evironmental variables

"D:\PATH\bin\avcodec-61.dll"
"D:\PATH\bin\avdevice-61.dll"
"D:\PATH\bin\avfilter-10.dll"
"D:\PATH\bin\avformat-61.dll"
"D:\PATH\bin\avutil-59.dll"
"D:\PATH\bin\ffmpeg.exe"
"D:\PATH\bin\ffplay.exe"
"D:\PATH\bin\ffprobe.exe"
"D:\PATH\bin\postproc-58.dll"
"D:\PATH\bin\swresample-5.dll"
"D:\PATH\bin\swscale-8.dll"
"D:\PATH\lib\avcodec.lib"
"D:\PATH\lib\avcodec-61.def"
"D:\PATH\lib\avdevice.lib"
"D:\PATH\lib\avdevice-61.def"
"D:\PATH\lib\avfilter.lib"
"D:\PATH\lib\avfilter-10.def"
"D:\PATH\lib\avformat.lib"
"D:\PATH\lib\avformat-61.def"
"D:\PATH\lib\avutil.lib"
"D:\PATH\lib\avutil-59.def"
"D:\PATH\lib\libavcodec.dll.a"
"D:\PATH\lib\libavdevice.dll.a"
"D:\PATH\lib\libavfilter.dll.a"
"D:\PATH\lib\libavformat.dll.a"
"D:\PATH\lib\libavutil.dll.a"
"D:\PATH\lib\libpostproc.dll.a"
"D:\PATH\lib\libswresample.dll.a"
"D:\PATH\lib\libswscale.dll.a"
"D:\PATH\lib\postproc.lib"
"D:\PATH\lib\postproc-58.def"
"D:\PATH\lib\swresample.lib"
"D:\PATH\lib\swresample-5.def"
"D:\PATH\lib\swscale.lib"
"D:\PATH\lib\swscale-8.def"