Also use 'auto' as default.
---
 libavcodec/ac3enc_opts_template.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/ac3enc_opts_template.c 
b/libavcodec/ac3enc_opts_template.c
index 7c0eead..342dcad 100644
--- a/libavcodec/ac3enc_opts_template.c
+++ b/libavcodec/ac3enc_opts_template.c
@@ -73,7 +73,7 @@ static const AVOption eac3_options[] = {
 /* Other Encoding Options */
 {"stereo_rematrixing", "Stereo Rematrixing", OFFSET(stereo_rematrixing), 
FF_OPT_TYPE_INT, {.dbl = 1 }, 0, 1, AC3ENC_PARAM},
 #if AC3ENC_TYPE != AC3ENC_TYPE_AC3_FIXED
-{"channel_coupling",   "Channel Coupling",   OFFSET(channel_coupling),   
FF_OPT_TYPE_INT, {.dbl = 1 }, 0, 1, AC3ENC_PARAM, "channel_coupling"},
+{"channel_coupling",   "Channel Coupling",   OFFSET(channel_coupling),   
FF_OPT_TYPE_INT, {.dbl = -1 }, -1, 1, AC3ENC_PARAM, "channel_coupling"},
     {"auto", "Selected by the Encoder", 0, FF_OPT_TYPE_CONST, {.dbl = -1 }, 
INT_MIN, INT_MAX, AC3ENC_PARAM, "channel_coupling"},
 {"cpl_start_band", "Coupling Start Band", OFFSET(cpl_start), FF_OPT_TYPE_INT, 
{.dbl = -1 }, -1, 15, AC3ENC_PARAM, "cpl_start_band"},
     {"auto", "Selected by the Encoder", 0, FF_OPT_TYPE_CONST, {.dbl = -1 }, 
INT_MIN, INT_MAX, AC3ENC_PARAM, "cpl_start_band"},
-- 
1.7.1

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