FFmpeg未找到时，忽略player_opencv用例

api/tests/CMakeLists.txt

 aux_source_directory(. TEST_SRC_LIST)
 foreach(TEST_SRC ${TEST_SRC_LIST})
     STRING(REGEX REPLACE "^\\./|\\.c[a-zA-Z0-9_]*$" "" TEST_EXE_NAME ${TEST_SRC})
+
+    if (NOT ENABLE_FFMPEG)
+        # 过滤掉依赖 FFmpeg 的测试模块
+        if ("${TEST_EXE_NAME}" MATCHES "player_opencv")
+            continue()
+        endif ()
+    endif ()
+
     message(STATUS "add c api tester:${TEST_EXE_NAME}")
     set(exe_name api_tester_${TEST_EXE_NAME})
     add_executable(${exe_name} ${TEST_SRC})