Linking dynamically with ffmpeg instead of compiling it

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "ffmpeg"]
-	path = ffmpeg
-	url = https://git.ffmpeg.org/ffmpeg.git

CMakeLists.txt

@@ -4,9 +4,7 @@ set(CMAKE_C_STANDARD 11)
 set(PROJECT_VERSION "1.0")
 project(transcoder VERSION ${PROJECT_VERSION} LANGUAGES C)
 
-include_directories(ffmpeg)
 include_directories(include)
-
 add_library(transcoder SHARED 
 	src/helper.c
 	src/info.c
@@ -16,32 +14,13 @@ add_library(transcoder SHARED
 	src/destroyer.c
 )
 set_property(TARGET transcoder PROPERTY C_STANDARD 11)
+set_property(TARGET transcoder PROPERTY POSITION_INDEPENDENT_CODE ON)
 
 target_link_libraries(transcoder avformat avcodec avutil)
-target_link_directories(transcoder PRIVATE
-	${CMAKE_SOURCE_DIR}/ffmpeg/libavformat
-	${CMAKE_SOURCE_DIR}/ffmpeg/libavcodec
-	${CMAKE_SOURCE_DIR}/ffmpeg/libavutil
-)
 target_link_libraries(transcoder m pthread)
 
 if(WIN32)
 	target_link_libraries(transcoder wsock32 ws2_32)
 	target_link_libraries(transcoder Secur32 Secur32)
 	target_link_libraries(transcoder Bcrypt Bcrypt)
-endif()
-
-include(ExternalProject)
-ExternalProject_Add(FFMPEG
-	SOURCE_DIR ${CMAKE_SOURCE_DIR}/ffmpeg
-	BUILD_IN_SOURCE 1
-	CONFIGURE_COMMAND ./configure --disable-shared --enable-static --enable-pic
-	                  --disable-debug --enable-gpl --enable-version3 --disable-asm
-	                  --disable-programs --disable-doc --disable-autodetect
-	                  --disable-avdevice --disable-swresample --disable-swscale --disable-postproc --disable-network
-	BUILD_COMMAND make
-	INSTALL_COMMAND cmake -E echo "Skipping install step."
-)
-add_dependencies(transcoder FFMPEG)
-set_property(TARGET transcoder PROPERTY POSITION_INDEPENDENT_CODE ON)
-
+endif()