avfilter/af_sidechaincompress: change default makeup gain to 1

This avoids producing out of range or clipped samples.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

doc/filters.texi

@@ -357,8 +357,8 @@ The filter accepts the following options:
 Set input gain. Default is 1. Range is between 0.015625 and 64.
 
 @item threshold
-If a signal of second stream rises above this level it will affect the gain
-reduction of the first stream.
+If a signal of stream rises above this level it will affect the gain
+reduction.
 By default it is 0.125. Range is between 0.00097563 and 1.
 
 @item ratio
@@ -376,7 +376,7 @@ reduction is decreased again. Default is 250. Range is between 0.01 and 9000.
 
 @item makeup
 Set the amount by how much signal will be amplified after processing.
-Default is 2. Range is from 1 and 64.
+Default is 1. Range is from 1 to 64.
 
 @item knee
 Curve the sharp knee around the threshold to enter gain reduction more softly.
@@ -3340,7 +3340,7 @@ reduction is decreased again. Default is 250. Range is between 0.01 and 9000.
 
 @item makeup
 Set the amount by how much signal will be amplified after processing.
-Default is 2. Range is from 1 and 64.
+Default is 1. Range is from 1 to 64.
 
 @item knee
 Curve the sharp knee around the threshold to enter gain reduction more softly.

libavfilter/af_sidechaincompress.c

@@ -72,7 +72,7 @@ static const AVOption options[] = {
     { "ratio",     "set ratio",          OFFSET(ratio),     AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   20, A|F },
     { "attack",    "set attack",         OFFSET(attack),    AV_OPT_TYPE_DOUBLE, {.dbl=20},           0.01, 2000, A|F },
     { "release",   "set release",        OFFSET(release),   AV_OPT_TYPE_DOUBLE, {.dbl=250},          0.01, 9000, A|F },
-    { "makeup",    "set make up gain",   OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   64, A|F },
+    { "makeup",    "set make up gain",   OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=1},               1,   64, A|F },
     { "knee",      "set knee",           OFFSET(knee),      AV_OPT_TYPE_DOUBLE, {.dbl=2.82843},         1,    8, A|F },
     { "link",      "set link type",      OFFSET(link),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F, "link" },
     {   "average", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F, "link" },