static int init(AVFilterContext *ctx, const char *args, void *opaque) { GraphContext *gctx = ctx->priv; if(!args) return 0; if(!(gctx->link_filter = avfilter_open(&vf_graph_dummy, NULL))) return -1; if(avfilter_init_filter(gctx->link_filter, NULL, ctx)) goto fail; return graph_load_chain_from_string(ctx, args, NULL, NULL); fail: avfilter_destroy(gctx->link_filter); return -1; }