while (babeltrace_iter_read_event(iter, &stream, &event) == 0) {
ret = sout->parent.event_cb(&sout->parent, stream);
if (ret) {
while (babeltrace_iter_read_event(iter, &stream, &event) == 0) {
ret = sout->parent.event_cb(&sout->parent, stream);
if (ret) {