AVSEEK_FORCE      439 libavformat/avio.c     ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
AVSEEK_FORCE      245 libavformat/aviobuf.c     int force = whence & AVSEEK_FORCE;
AVSEEK_FORCE      248 libavformat/aviobuf.c     whence &= ~AVSEEK_FORCE;