static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter, AVFilterInOut *in) { AVFilterContext *last_filter; const AVFilter *buffer_filt = avfilter_get_by_name("buffer"); InputStream *ist = ifilter->ist; InputFile *f = input_files[ist->file_index]; AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) : ist->st->time_base; AVRational sar; char args[255], name[255]; int ret, pad_idx = 0; sar = ist->st->sample_aspect_ratio.num ? ist->st->sample_aspect_ratio : ist->st->codec->sample_aspect_ratio; snprintf(args, sizeof(args), "%d:%d:%d:%d:%d:%d:%d", ist->st->codec->width, ist->st->codec->height, ist->st->codec->pix_fmt, tb.num, tb.den, sar.num, sar.den); snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index, ist->file_index, ist->st->index); if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name, args, NULL, fg->graph)) < 0) return ret; last_filter = ifilter->filter; if (ist->framerate.num) { AVFilterContext *setpts; snprintf(name, sizeof(name), "force CFR for input from stream %d:%d", ist->file_index, ist->st->index); if ((ret = avfilter_graph_create_filter(&setpts, avfilter_get_by_name("setpts"), name, "N", NULL, fg->graph)) < 0) return ret; if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0) return ret; last_filter = setpts; } snprintf(name, sizeof(name), "trim for input stream %d:%d", ist->file_index, ist->st->index); ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ? AV_NOPTS_VALUE : 0, INT64_MAX, &last_filter, &pad_idx, name); if (ret < 0) return ret; if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0) return ret; return 0; }