static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) { AVFilterContext *ctx = inlink->dst; SeparateFieldsContext *sf = ctx->priv; AVFilterLink *outlink = ctx->outputs[0]; AVFrame *second; int i, ret; inpicref->height = outlink->h; inpicref->interlaced_frame = 0; second = av_frame_clone(inpicref); if (!second) return AVERROR(ENOMEM); for (i = 0; i < sf->nb_planes; i++) { if (!inpicref->top_field_first) inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i]; else second->data[i] = second->data[i] + second->linesize[i]; inpicref->linesize[i] *= 2; second->linesize[i] *= 2; } inpicref->pts = outlink->frame_count * sf->ts_unit; ret = ff_filter_frame(outlink, inpicref); if (ret < 0) return ret; second->pts = outlink->frame_count * sf->ts_unit; return ff_filter_frame(outlink, second); }