--- common/osdep.h.orig	2021-06-13 20:43:57.000000000 +0800
+++ common/osdep.h	2021-09-09 13:22:28.067168000 +0800
@@ -568,8 +568,13 @@
 #define x264_lower_thread_priority(p)\
     { UNUSED status_t nice_ret = set_thread_priority( find_thread( NULL ), B_LOW_PRIORITY ); }
 #else
+#if 0
+// BUG: Don't use nice(3), it will affect the whole process, not only the calling thread!
 #include <unistd.h>
 #define x264_lower_thread_priority(p) { UNUSED int nice_ret = nice(p); }
+#else
+#define x264_lower_thread_priority(p)
+#endif
 #endif /* SYS_WINDOWS */
 #elif HAVE_WIN32THREAD
 #define x264_lower_thread_priority(p) SetThreadPriority( GetCurrentThread(), X264_MAX( -2, -p ) )