amplify_frame     721 libavfilter/af_dynaudnorm.c         amplify_frame(s, out, is_enabled > 0.);
amplify_frame     270 libavfilter/vf_amplify.c         ctx->internal->execute(ctx, amplify_frame, &td, NULL, FFMIN(s->height[1], ff_filter_get_nb_threads(ctx)));