static int insert_trim(OutputStream *ost, AVFilterContext **last_filter, int *pad_idx) { OutputFile *of = output_files[ost->file_index]; AVFilterGraph *graph = (*last_filter)->graph; AVFilterContext *ctx; const AVFilter *trim; const char *name = ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO ? "trim" : "atrim"; char filter_name[128]; int ret = 0; if (of->recording_time == INT64_MAX && !of->start_time) return 0; trim = avfilter_get_by_name(name); if (!trim) { av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit " "recording time.\n", name); return AVERROR_FILTER_NOT_FOUND; } snprintf(filter_name, sizeof(filter_name), "%s for output stream %d:%d", name, ost->file_index, ost->index); ctx = avfilter_graph_alloc_filter(graph, trim, filter_name); if (!ctx) return AVERROR(ENOMEM); if (of->recording_time != INT64_MAX) { ret = av_opt_set_double(ctx, "duration", (double)of->recording_time / 1e6, AV_OPT_SEARCH_CHILDREN); } if (ret >= 0 && of->start_time) { ret = av_opt_set_double(ctx, "start", (double)of->start_time / 1e6, AV_OPT_SEARCH_CHILDREN); } if (ret < 0) { av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name); return ret; } ret = avfilter_init_str(ctx, NULL); if (ret < 0) return ret; ret = avfilter_link(*last_filter, *pad_idx, ctx, 0); if (ret < 0) return ret; *last_filter = ctx; *pad_idx = 0; return 0; }