if (ret)
return ret;
- rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
- if (!rt->real_setup_cache)
+ rt->real_setup_cache = !s->nb_streams ? NULL :
+ av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
+ if (!rt->real_setup_cache && s->nb_streams)
return AVERROR(ENOMEM);
rt->real_setup = rt->real_setup_cache + s->nb_streams;