Same logic but try exposing the include directories as public

Author: NicolasHug

src/torchcodec/_core/CMakeLists.txt

@@ -71,14 +71,23 @@ function(make_torchcodec_sublibrary
         )
     endif()
 
-    # For the core library, use PRIVATE to prevent FFmpeg dependencies from leaking
-    # For other libraries, use PUBLIC so they can properly link to their dependencies
+    # For the core library, make dependencies PRIVATE to prevent transitive linking issues
+    # but still expose include directories
     if(${library_name} MATCHES ".*_core[0-9]+$")
         target_link_libraries(
             ${library_name}
             PRIVATE
             ${library_dependencies}
         )
+        # Manually expose FFmpeg include directories as PUBLIC for compilation
+        foreach(dep ${library_dependencies})
+            if(TARGET ${dep})
+                get_target_property(dep_include_dirs ${dep} INTERFACE_INCLUDE_DIRECTORIES)
+                if(dep_include_dirs)
+                    target_include_directories(${library_name} PUBLIC ${dep_include_dirs})
+                endif()
+            endif()
+        endforeach()
     else()
         target_link_libraries(
             ${library_name}