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Diffstat (limited to 'chromium/third_party/ffmpeg/doc/decoders.texi')
| -rw-r--r-- | chromium/third_party/ffmpeg/doc/decoders.texi | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/chromium/third_party/ffmpeg/doc/decoders.texi b/chromium/third_party/ffmpeg/doc/decoders.texi index 9d9f2984713..9309b82a587 100644 --- a/chromium/third_party/ffmpeg/doc/decoders.texi +++ b/chromium/third_party/ffmpeg/doc/decoders.texi @@ -14,7 +14,7 @@ You can disable all the decoders with the configure option with the options @code{--enable-decoder=@var{DECODER}} / @code{--disable-decoder=@var{DECODER}}. -The option @code{-codecs} of the ff* tools will display the list of +The option @code{-decoders} of the ff* tools will display the list of enabled decoders. @c man end DECODERS @@ -52,6 +52,37 @@ top-field-first is assumed @chapter Audio Decoders @c man begin AUDIO DECODERS +A description of some of the currently available audio decoders +follows. + +@section ac3 + +AC-3 audio decoder. + +This decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as well as +the undocumented RealAudio 3 (a.k.a. dnet). + +@subsection AC-3 Decoder Options + +@table @option + +@item -drc_scale @var{value} +Dynamic Range Scale Factor. The factor to apply to dynamic range values +from the AC-3 stream. This factor is applied exponentially. +There are 3 notable scale factor ranges: +@table @option +@item drc_scale == 0 +DRC disabled. Produces full range audio. +@item 0 < drc_scale <= 1 +DRC enabled. Applies a fraction of the stream DRC value. +Audio reproduction is between full range and full compression. +@item drc_scale > 1 +DRC enabled. Applies drc_scale asymmetrically. +Loud sounds are fully compressed. Soft sounds are enhanced. +@end table + +@end table + @section ffwavesynth Internal wave synthetizer. |