4 Decoders are configured elements in Libav which allow the decoding of
7 When you configure your Libav build, all the supported native decoders
8 are enabled by default. Decoders requiring an external library must be enabled
9 manually via the corresponding @code{--enable-lib} option. You can list all
10 available decoders using the configure option @code{--list-decoders}.
12 You can disable all the decoders with the configure option
13 @code{--disable-decoders} and selectively enable / disable single decoders
14 with the options @code{--enable-decoder=@var{DECODER}} /
15 @code{--disable-decoder=@var{DECODER}}.
17 The option @code{-decoders} of the av* tools will display the list of
22 @chapter Audio Decoders
23 @c man begin AUDIO DECODERS
25 A description of some of the currently available audio decoders
32 This decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as well as
33 the undocumented RealAudio 3 (a.k.a. dnet).
35 @subsection AC-3 Decoder Options
39 @item -drc_scale @var{value}
40 Dynamic Range Scale Factor. The factor to apply to dynamic range values
41 from the AC-3 stream. This factor is applied exponentially.
42 There are 3 notable scale factor ranges:
45 DRC disabled. Produces full range audio.
46 @item 0 < drc_scale <= 1
47 DRC enabled. Applies a fraction of the stream DRC value.
48 Audio reproduction is between full range and full compression.
50 DRC enabled. Applies drc_scale asymmetrically.
51 Loud sounds are fully compressed. Soft sounds are enhanced.
56 @c man end AUDIO DECODERS