static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output) { AVSubtitle subtitle; int i, ret = avcodec_decode_subtitle2(ist->dec_ctx, &subtitle, got_output, pkt); check_decode_result(got_output, ret); if (ret < 0 || !*got_output) { if (!pkt->size) sub2video_flush(ist); return ret; } if (ist->fix_sub_duration) { int end = 1; if (ist->prev_sub.got_output) { end = av_rescale(subtitle.pts - ist->prev_sub.subtitle.pts, 1000, AV_TIME_BASE); if (end < ist->prev_sub.subtitle.end_display_time) { av_log(ist->dec_ctx, AV_LOG_DEBUG, "Subtitle duration reduced from %d to %d%s\n", ist->prev_sub.subtitle.end_display_time, end, end <= 0 ? ", dropping it" : ""); ist->prev_sub.subtitle.end_display_time = end; } } FFSWAP(int, *got_output, ist->prev_sub.got_output); FFSWAP(int, ret, ist->prev_sub.ret); FFSWAP(AVSubtitle, subtitle, ist->prev_sub.subtitle); if (end <= 0) goto out; } if (!*got_output) return ret; sub2video_update(ist, &subtitle); if (!subtitle.num_rects) goto out; ist->frames_decoded++; for (i = 0; i < nb_output_streams; i++) { OutputStream *ost = output_streams[i]; if (!check_output_constraints(ist, ost) || !ost->encoding_needed || ost->enc->type != AVMEDIA_TYPE_SUBTITLE) continue; do_subtitle_out(output_files[ost->file_index]->ctx, ost, ist, &subtitle); } out: avsubtitle_free(&subtitle); return ret; }