Use ffmpeg 8.1

Author: superm1

src/CMakeLists.txt

@@ -132,7 +132,7 @@ else()
     # ———————————————————————————————————————————————
     if(NEED_BUILD_FFMPEG_STATIC)
         set(FFMPEG_GIT_REPO "https://github.com/FFmpeg/FFmpeg.git" CACHE STRING "FFmpeg Git repository URL")
-        set(FFMPEG_GIT_TAG "n7.1" CACHE STRING "FFmpeg Git tag/branch to fetch")
+        set(FFMPEG_GIT_TAG "n8.1" CACHE STRING "FFmpeg Git tag/branch to fetch")
 
         FetchContent_Declare(
             ffmpeg_source