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- @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{-codecs} 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 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
-
- @section ffwavesynth
-
- Internal wave synthetizer.
-
- 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
-
- @c man end AUDIO DECODERS
-
- @chapter Subtitles Decoders
- @c man begin SUBTILES DECODERS
-
- @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}.
- @end table
-
- @c man end SUBTILES DECODERS
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