INNER_FRAME       510 libavfilter/af_loudnorm.c         s->frame_type = INNER_FRAME;
INNER_FRAME       513 libavfilter/af_loudnorm.c     case INNER_FRAME:
INNER_FRAME       648 libavfilter/af_loudnorm.c     if (ret == AVERROR_EOF && s->frame_type == INNER_FRAME) {