PTHREAD_ONCE_INIT   36 libavcodec/ffjni.c static pthread_once_t once = PTHREAD_ONCE_INIT;
PTHREAD_ONCE_INIT  106 libavcodec/videotoolboxenc.c static pthread_once_t once_ctrl = PTHREAD_ONCE_INIT;
PTHREAD_ONCE_INIT  158 libavutil/thread.h #define AV_ONCE_INIT PTHREAD_ONCE_INIT