Fixed FFMPEG detection without pkgconfig

cmake/FindFFmpeg.cmake

@@ -27,12 +27,20 @@ find_library(AVUTIL_LIBRARY avutil PATHS ${AVUTIL_LIBRARY_DIRS})
 
 # swresample
 find_path(SWRESAMPLE_INCLUDE_DIR libswresample/swresample.h PATHS ${SWRESAMPLE_INCLUDE_DIRS})
-find_library(SWRESAMPLE_LIBRARY swresample PATHS ${SWRESAMPLE_LIBRARY_DIRS})
+find_library(SWRESAMPLE_LIBRARY NAMES swresample swresample-3 PATHS ${SWRESAMPLE_LIBRARY_DIRS})
+
+if (SWRESAMPLE_INCLUDE_DIR AND SWRESAMPLE_LIBRARY)
+	set(SWRESAMPLE_FOUND ON)
+endif()
 
 # avresample
 find_path(AVRESAMPLE_INCLUDE_DIR libavresample/avresample.h PATHS ${AVRESAMPLE_INCLUDE_DIRS})
 find_library(AVRESAMPLE_LIBRARY avresample PATHS ${AVRESAMPLE_LIBRARY_DIRS})
 
+if (AVRESAMPLE_INCLUDE_DIR AND AVRESAMPLE_LIBRARY)
+	set(AVRESAMPLE_FOUND ON)
+endif()
+
 if (AVCODEC_INCLUDE_DIR AND AVCODEC_LIBRARY)
 	set(AVCODEC_FOUND TRUE)
 endif(AVCODEC_INCLUDE_DIR AND AVCODEC_LIBRARY)