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Using a more reasonably SILK surround calibration value

Still needs more tuning

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -1521,7 +1521,7 @@

            }

            /* Conservative rate reduction, we cut the masking in half */

            masking_depth = HALF16(mask_sum / end*st->channels);

-           masking_depth += QCONST16(.4f, DB_SHIFT);

+           masking_depth += QCONST16(.1f, DB_SHIFT);

            rate_offset = (opus_int32)PSHR32(MULT16_16(srate, masking_depth), DB_SHIFT);

            rate_offset = MAX32(rate_offset, -2*st->silk_mode.bitRate/3);

            st->silk_mode.bitRate += rate_offset;