Disable ffmpeg test.

--- 3aff3784cfc408bed41641c413f670728fe3c181/cmake/Options.cmake	2025-07-13 14:33:32.000000000 +0100
+++ 3aff3784cfc408bed41641c413f670728fe3c181/cmake/Options.cmake	2025-07-13 14:57:52.528145135 +0100
@@ -112,7 +112,7 @@
 
 option(FIND_FFMPEG_APPLE "Find using Apple FFMPEG function" OFF)
 
-if(NOT TRANSLATIONS_ONLY AND (NOT DEFINED ENABLE_FFMPEG OR ENABLE_FFMPEG))
+if(FALSE AND NOT TRANSLATIONS_ONLY AND (NOT DEFINED ENABLE_FFMPEG OR ENABLE_FFMPEG))
     set(FFMPEG_DEFAULT ON)
 
     if (APPLE OR FIND_FFMPEG_APPLE)