Fix typos

Author: SKPG-Tech

CMakeLists.txt

@@ -1,12 +1,12 @@
 cmake_minimum_required(VERSION 3.17)
 project(libav_tutorial)
 
-# set out direcroty
+# set out directory
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
-# set ffmeg root directory
+# set ffmpeg root directory
 if(NOT FFMPEG_DEV_ROOT)
     message(FATAL_ERROR "set FFMPEG_DEV_ROOT to use ffmpeg libraries")
 endif()