diff --git a/ffpyplayer/clib/misc.c b/ffpyplayer/clib/misc.c
index 55181d1..6011ffa 100644
--- a/ffpyplayer/clib/misc.c
+++ b/ffpyplayer/clib/misc.c
@@ -1,8 +1,7 @@
-
 #include "misc.h"

 #define FLAGS (o->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0
-void print_all_libs_info(int flags, int level)
+void __attribute__ ((visibility ("hidden"))) print_all_libs_info(int flags, int level)
 {
 #if CONFIG_AVUTIL
     PRINT_LIB_INFO(avutil,   AVUTIL,   flags, level);
@@ -30,7 +29,7 @@ void print_all_libs_info(int flags, int level)
 #endif
 }

-const AVOption *opt_find(void *obj, const char *name, const char *unit,
+const AVOption __attribute__ ((visibility ("hidden"))) *opt_find(void *obj, const char *name, const char *unit,
     int opt_flags, int search_flags)
 {
     const AVOption *o = av_opt_find(obj, name, unit, opt_flags, search_flags);
@@ -40,7 +39,7 @@ const AVOption *opt_find(void *obj, const char *name, const char *unit,
 }

 #define FLAGS (o->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0
-int opt_default(const char *opt, const char *arg,
+int __attribute__ ((visibility ("hidden"))) opt_default(const char *opt, const char *arg,
     struct SwsContext *sws_opts, AVDictionary **sws_dict, AVDictionary **swr_opts,
     AVDictionary **resample_opts, AVDictionary **format_opts, AVDictionary **codec_opts)
 {
@@ -140,7 +139,7 @@ int opt_default(const char *opt, const char *arg,
     return AVERROR_OPTION_NOT_FOUND;
 }

-int get_plane_sizes(int size[4], int required_plane[4], enum AVPixelFormat pix_fmt,
+int __attribute__ ((visibility ("hidden"))) get_plane_sizes(int size[4], int required_plane[4], enum AVPixelFormat pix_fmt,
     int height, const int linesizes[4])
 {
     int i, total_size;