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More FEC tuning: lowering the LBRR bitrate a bit

--- a/silk/control_codec.c

+++ b/silk/control_codec.c

@@ -415,7 +415,7 @@

             /* Previous packet did not have LBRR, and was therefore coded at a higher bitrate */

             psEncC->LBRR_GainIncreases = 7;

         } else {

-            psEncC->LBRR_GainIncreases = silk_max_int( 7 - silk_SMULWB( (opus_int32)psEncC->PacketLoss_perc, SILK_FIX_CONST( 0.4, 16 ) ), 2 );

+            psEncC->LBRR_GainIncreases = silk_max_int( 7 - silk_SMULWB( (opus_int32)psEncC->PacketLoss_perc, SILK_FIX_CONST( 0.2, 16 ) ), 3 );

         }

     }