Allow disabling CrystalHD for ffmpeg.

CMake/DefineOptions.cmake

@@ -33,6 +33,7 @@ else()
     option(WITH_FFMPEG "Build with FFMPEG." ON)
     # Builder beware: later versions of ffmpeg may break!
     option(WITH_SYSTEM_FFMPEG "Build with the system's FFMPEG." OFF)
+    option(WITH_CRYSTALHD_DISABLED "Build FFMPEG without Crystal HD support." OFF)
     option(WITH_LIBVA "Build with libVa support for Video Acceleration." OFF)
     option(WITH_TTY "Build with Linux TTY Input Support." OFF)
     option(WITH_PROFILING "Build with Profiling Support." OFF)

CMakeLists.txt

@@ -291,6 +291,10 @@ elseif(LINUX)
         )
       endif()
 
+      if (WITH_CRYSTALHD_DISABLED)
+        list(APPEND FFMPEG_CONFIGURE "--disable-crystalhd")
+      endif()
+
       if (NOT WITH_EXTERNAL_WARNINGS)
         list(APPEND FFMPEG_CONFIGURE
           "--extra-cflags=-w"