+ bool success = (*input)->connect_signal(signal_num);
+ if (!success) {
+ lua_Debug ar;
+ lua_getstack(L, 1, &ar);
+ lua_getinfo(L, "nSl", &ar);
+ fprintf(stderr, "ERROR: %s:%d: Calling connect_signal() on a video or HTML input. Ignoring.\n",
+ ar.source, ar.currentline);
+ }