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Disables temporal VBR for LFE

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1551,6 +1551,8 @@

       surround_masking = DIV32_16(mask_avg,C*st->end) + QCONST16(.0f, DB_SHIFT);

       surround_masking = MIN16(MAX16(surround_masking,-QCONST16(1.5f, DB_SHIFT)), 0);

    }

+   /* Temporal VBR (but not for LFE) */

+   if (!st->lfe)

    {

       opus_val16 follow=-QCONST16(10.0f,DB_SHIFT);

       float frame_avg=0;