Merge pull request #10530 from shuffle2/win-ffmpeg

windows: move ffmpeg bins to submodule

.gitmodules

@@ -8,3 +8,8 @@
 	url = https://github.com/mgba-emu/mgba.git
 	branch = master
 	shallow = true
+[submodule "Externals/FFmpeg-bin"]
+	path = Externals/FFmpeg-bin
+	url = https://github.com/dolphin-emu/ext-win-ffmpeg.git
+	branch = master
+	shallow = true

CMakeLists.txt

@@ -485,8 +485,12 @@ if(ENABLE_EGL)
 endif()
 
 if(ENCODE_FRAMEDUMPS)
-  if(WIN32 AND _M_X86_64)
-    set(FFMPEG_DIR Externals/ffmpeg)
+  if(WIN32)
+    if(_M_X86_64)
+      set(FFMPEG_DIR Externals/FFmpeg-bin/x64)
+    elseif(_M_ARM_64)
+      set(FFMPEG_DIR Externals/FFmpeg-bin/ARM64)
+    endif()
   endif()
   find_package(FFmpeg COMPONENTS avcodec avformat avutil swresample swscale)
   if(FFmpeg_FOUND)