@chapter Decoders
 @c man begin DECODERS
 
 Decoders are configured elements in FFmpeg which allow the decoding of
 multimedia streams.
 
 When you configure your FFmpeg build, all the supported native decoders
 are enabled by default. Decoders requiring an external library must be enabled
 manually via the corresponding @code{--enable-lib} option. You can list all
 available decoders using the configure option @code{--list-decoders}.
 
 You can disable all the decoders with the configure option
 @code{--disable-decoders} and selectively enable / disable single decoders
 with the options @code{--enable-decoder=@var{DECODER}} /
 @code{--disable-decoder=@var{DECODER}}.
 

 The option @code{-decoders} of the ff* tools will display the list of

 enabled decoders.
 
 @c man end DECODERS

 
 @chapter Video Decoders
 @c man begin VIDEO DECODERS
 
 A description of some of the currently available video decoders
 follows.
 

 @section hevc
 
 HEVC / H.265 decoder.
 
 Note: the @option{skip_loop_filter} option has effect only at level
 @code{all}.
 

 @section rawvideo
 

 Raw video decoder.

 This decoder decodes rawvideo streams.

 
 @subsection Options
 
 @table @option
 @item top @var{top_field_first}
 Specify the assumed field type of the input video.
 @table @option
 @item -1
 the video is assumed to be progressive (default)
 @item 0
 bottom-field-first is assumed
 @item 1
 top-field-first is assumed
 @end table
 
 @end table
 
 @c man end VIDEO DECODERS

 
 @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 flac
 
 FLAC audio decoder.
 
 This decoder aims to implement the complete FLAC specification from Xiph.
 
 @subsection FLAC Decoder options
 
 @table @option
 
 @item -use_buggy_lpc
 The lavc FLAC encoder used to produce buggy streams with high lpc values

 (like the default value). This option makes it possible to decode such streams

 correctly by using lavc's old buggy lpc logic for decoding.
 
 @end table
 

 @section ffwavesynth
 

 Internal wave synthesizer.

 
 This decoder generates wave patterns according to predefined sequences. Its
 use is purely internal and the format of the data it accepts is not publicly
 documented.
 

 @section libcelt
 

 libcelt decoder wrapper.

 
 libcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio codec.
 Requires the presence of the libcelt headers and library during configuration.
 You need to explicitly configure the build with @code{--enable-libcelt}.
 

 @section libgsm
 

 libgsm decoder wrapper.

 
 libgsm allows libavcodec to decode the GSM full rate audio codec. Requires
 the presence of the libgsm headers and library during configuration. You need
 to explicitly configure the build with @code{--enable-libgsm}.
 
 This decoder supports both the ordinary GSM and the Microsoft variant.
 

 @section libilbc
 

 libilbc decoder wrapper.

 
 libilbc allows libavcodec to decode the Internet Low Bitrate Codec (iLBC)
 audio codec. Requires the presence of the libilbc headers and library during
 configuration. You need to explicitly configure the build with
 @code{--enable-libilbc}.
 
 @subsection Options
 
 The following option is supported by the libilbc wrapper.
 
 @table @option
 @item enhance
 
 Enable the enhancement of the decoded audio when set to 1. The default
 value is 0 (disabled).
 
 @end table
 

 @section libopencore-amrnb
 

 libopencore-amrnb decoder wrapper.

 
 libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate
 Narrowband audio codec. Using it requires the presence of the
 libopencore-amrnb headers and library during configuration. You need to
 explicitly configure the build with @code{--enable-libopencore-amrnb}.
 
 An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB
 without this library.
 

 @section libopencore-amrwb
 
 libopencore-amrwb decoder wrapper.
 
 libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate
 Wideband audio codec. Using it requires the presence of the
 libopencore-amrwb headers and library during configuration. You need to
 explicitly configure the build with @code{--enable-libopencore-amrwb}.
 
 An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB
 without this library.
 

 @section libopus
 
 libopus decoder wrapper.
 
 libopus allows libavcodec to decode the Opus Interactive Audio Codec.
 Requires the presence of the libopus headers and library during
 configuration. You need to explicitly configure the build with
 @code{--enable-libopus}.
 

 An FFmpeg native decoder for Opus exists, so users can decode Opus
 without this library.
 

 @c man end AUDIO DECODERS

 
 @chapter Subtitles Decoders
 @c man begin SUBTILES DECODERS
 

 @section dvbsub
 
 @subsection Options
 
 @table @option
 @item compute_clut
 @table @option
 @item -1
 Compute clut if no matching CLUT is in the stream.
 @item 0
 Never compute CLUT
 @item 1
 Always compute CLUT and override the one provided in the stream.
 @end table

 @item dvb_substream
 Selects the dvb substream, or all substreams if -1 which is default.

 
 @end table
 

 @section dvdsub
 
 This codec decodes the bitmap subtitles used in DVDs; the same subtitles can
 also be found in VobSub file pairs and in some Matroska files.
 

 @subsection Options

 
 @table @option
 @item palette
 Specify the global palette used by the bitmaps. When stored in VobSub, the
 palette is normally specified in the index file; in Matroska, the palette is
 stored in the codec extra-data in the same format as in VobSub. In DVDs, the
 palette is stored in the IFO file, and therefore not available when reading
 from dumped VOB files.
 
 The format for this option is a string containing 16 24-bits hexadecimal
 numbers (without 0x prefix) separated by comas, for example @code{0d00ee,
 ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b}.

 @item ifo_palette

 Specify the IFO file from which the global palette is obtained.

 (experimental)
 

 @item forced_subs_only
 Only decode subtitle entries marked as forced. Some titles have forced
 and non-forced subtitles in the same track. Setting this flag to @code{1}
 will only keep the forced subtitles. Default value is @code{0}.

 @end table
 

 @section libzvbi-teletext
 
 Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext
 subtitles. Requires the presence of the libzvbi headers and library during
 configuration. You need to explicitly configure the build with
 @code{--enable-libzvbi}.
 
 @subsection Options
 
 @table @option
 @item txt_page
 List of teletext page numbers to decode. You may use the special * string to
 match all pages. Pages that do not match the specified list are dropped.
 Default value is *.
 @item txt_chop_top
 Discards the top teletext line. Default value is 1.
 @item txt_format
 Specifies the format of the decoded subtitles. The teletext decoder is capable
 of decoding the teletext pages to bitmaps or to simple text, you should use
 "bitmap" for teletext pages, because certain graphics and colors cannot be
 expressed in simple text. You might use "text" for teletext based subtitles if
 your application can handle simple text based subtitles. Default value is
 bitmap.
 @item txt_left
 X offset of generated bitmaps, default is 0.
 @item txt_top
 Y offset of generated bitmaps, default is 0.
 @item txt_chop_spaces
 Chops leading and trailing spaces and removes empty lines from the generated
 text. This option is useful for teletext based subtitles where empty spaces may
 be present at the start or at the end of the lines or empty lines may be

 present between the subtitle lines because of double-sized teletext characters.

 Default value is 1.
 @item txt_duration
 Sets the display duration of the decoded teletext pages or subtitles in

 milliseconds. Default value is 30000 which is 30 seconds.

 @item txt_transparent
 Force transparent background of the generated teletext bitmaps. Default value

 is 0 which means an opaque background.
 @item txt_opacity
 Sets the opacity (0-255) of the teletext background. If
 @option{txt_transparent} is not set, it only affects characters between a start
 box and an end box, typically subtitles. Default value is 0 if
 @option{txt_transparent} is set, 255 otherwise.
 

 @end table
 

 @c man end SUBTILES DECODERS