- av_bprint_finalize(&buffer, &dec_sub);
- ff_ass_add_rect(sub, dec_sub, avpkt->pts, avpkt->duration, 0);
- av_free(dec_sub);
+ ret = ff_ass_add_rect_bprint(sub, &buffer, avpkt->pts, avpkt->duration);
+ av_bprint_finalize(&buffer, NULL);
+ if (ret < 0)
+ return ret;