diff --git a/dom/media/platforms/EncoderConfig.h b/dom/media/platforms/EncoderConfig.h
index 26030d90df54e..fb0fefc7f6569 100644
--- a/dom/media/platforms/EncoderConfig.h
+++ b/dom/media/platforms/EncoderConfig.h
@@ -303,6 +303,26 @@ aFormat
 }
 }
 ;
+enum
+class
+OpusBitstreamFormat
+{
+Opus
+OGG
+}
+;
+/
+/
+The
+default
+values
+come
+from
+the
+Web
+Codecs
+specification
+.
 struct
 OpusSpecific
 final
@@ -311,26 +331,65 @@ enum
 class
 Application
 {
+Unspecified
 Voip
 Audio
 RestricedLowDelay
 }
 ;
-enum
-class
-OpusBitstreamFormat
-{
-Opus
-OGG
-}
+Application
+mApplication
+=
+Application
+:
+:
+Unspecified
 ;
-enum
-class
+uint64_t
+mFrameDuration
+=
+20000
+;
+/
+/
+microseconds
+uint8_t
+mComplexity
+=
+10
+;
+/
+/
+0
+-
+10
 OpusBitstreamFormat
-{
+mFormat
+=
+OpusBitstreamFormat
+:
+:
 Opus
-OGG
-}
+;
+uint64_t
+mPacketLossPerc
+=
+0
+;
+/
+/
+0
+-
+100
+bool
+mUseInBandFEC
+=
+false
+;
+bool
+mUseDTX
+=
+false
 ;
 }
 ;
diff --git a/dom/media/platforms/ffmpeg/FFmpegAudioEncoder.cpp b/dom/media/platforms/ffmpeg/FFmpegAudioEncoder.cpp
index d08157e191c12..9243f21d6c7c1 100644
--- a/dom/media/platforms/ffmpeg/FFmpegAudioEncoder.cpp
+++ b/dom/media/platforms/ffmpeg/FFmpegAudioEncoder.cpp
@@ -913,6 +913,356 @@ off
 )
 ;
 }
+if
+(
+mConfig
+.
+mCodecSpecific
+.
+isSome
+(
+)
+)
+{
+MOZ_ASSERT
+(
+mConfig
+.
+mCodecSpecific
+-
+>
+is
+<
+OpusSpecific
+>
+(
+)
+)
+;
+const
+OpusSpecific
+&
+specific
+=
+mConfig
+.
+mCodecSpecific
+-
+>
+as
+<
+OpusSpecific
+>
+(
+)
+;
+/
+/
+This
+attribute
+maps
+directly
+to
+complexity
+mCodecContext
+-
+>
+compression_level
+=
+specific
+.
+mComplexity
+;
+FFMPEG_LOG
+(
+"
+Opus
+complexity
+set
+to
+%
+d
+"
+specific
+.
+mComplexity
+)
+;
+float
+frameDurationMs
+=
+AssertedCast
+<
+float
+>
+(
+specific
+.
+mFrameDuration
+)
+/
+1000
+.
+f
+;
+if
+(
+mLib
+-
+>
+av_opt_set_double
+(
+mCodecContext
+-
+>
+priv_data
+"
+frame_duration
+"
+frameDurationMs
+0
+)
+)
+{
+FFMPEG_LOG
+(
+"
+Error
+setting
+the
+frame
+duration
+on
+Opus
+encoder
+"
+)
+;
+return
+NS_ERROR_FAILURE
+;
+}
+FFMPEG_LOG
+(
+"
+Opus
+frame
+duration
+set
+to
+%
+0
+.
+2f
+"
+frameDurationMs
+)
+;
+if
+(
+specific
+.
+mPacketLossPerc
+)
+{
+if
+(
+mLib
+-
+>
+av_opt_set_int
+(
+mCodecContext
+-
+>
+priv_data
+"
+packet_loss
+"
+AssertedCast
+<
+int64_t
+>
+(
+specific
+.
+mPacketLossPerc
+)
+0
+)
+)
+{
+FFMPEG_LOG
+(
+"
+Error
+setting
+the
+packet
+loss
+percentage
+to
+%
+"
+PRIu64
+"
+on
+Opus
+encoder
+"
+specific
+.
+mPacketLossPerc
+)
+;
+return
+NS_ERROR_FAILURE
+;
+}
+FFMPEG_LOGV
+(
+"
+Packet
+loss
+set
+to
+%
+d
+%
+%
+in
+Opus
+encoder
+"
+AssertedCast
+<
+int
+>
+(
+specific
+.
+mPacketLossPerc
+)
+)
+;
+}
+if
+(
+specific
+.
+mUseInBandFEC
+)
+{
+if
+(
+mLib
+-
+>
+av_opt_set
+(
+mCodecContext
+-
+>
+priv_data
+"
+fec
+"
+"
+on
+"
+0
+)
+)
+{
+FFMPEG_LOG
+(
+"
+Error
+%
+s
+FEC
+on
+Opus
+encoder
+"
+specific
+.
+mUseInBandFEC
+?
+"
+enabling
+"
+:
+"
+disabling
+"
+)
+;
+return
+NS_ERROR_FAILURE
+;
+}
+FFMPEG_LOGV
+(
+"
+In
+-
+band
+FEC
+enabled
+for
+Opus
+encoder
+.
+"
+)
+;
+}
+/
+/
+TODO
+:
+DTX
+format
+/
+/
+https
+:
+/
+/
+bugzilla
+.
+mozilla
+.
+org
+/
+show_bug
+.
+cgi
+?
+id
+=
+1876064
+/
+/
+https
+:
+/
+/
+bugzilla
+.
+mozilla
+.
+org
+/
+show_bug
+.
+cgi
+?
+id
+=
+1876066
+}
 }
 /
 /
@@ -951,27 +1301,6 @@ mCodecContext
 sample_rate
 }
 ;
-/
-/
-Apply
-codec
-specific
-settings
-.
-nsAutoCString
-codecSpecificLog
-;
-if
-(
-mConfig
-.
-mCodecSpecific
-)
-{
-/
-/
-TODO
-}
 MediaResult
 rv
 =
@@ -2697,13 +3026,6 @@ mSampleRate
 ;
 /
 /
-Add
-here
-the
-new
-rate
-/
-/
 Handle
 encoder
 delay