- FFMContext *ffm = s->priv_data;
- ffm->write_index = pos;
- ffm->file_size = file_size;
+ av_opt_set_int(s, "server_attached", 1, AV_OPT_SEARCH_CHILDREN);
+ av_opt_set_int(s, "write_index", pos, AV_OPT_SEARCH_CHILDREN);
+ av_opt_set_int(s, "file_size", file_size, AV_OPT_SEARCH_CHILDREN);