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161 lines
4.6 KiB
161 lines
4.6 KiB
@chapter Decoders |
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@c man begin DECODERS |
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Decoders are configured elements in FFmpeg which allow the decoding of |
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multimedia streams. |
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When you configure your FFmpeg build, all the supported native decoders |
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are enabled by default. Decoders requiring an external library must be enabled |
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manually via the corresponding @code{--enable-lib} option. You can list all |
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available decoders using the configure option @code{--list-decoders}. |
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You can disable all the decoders with the configure option |
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@code{--disable-decoders} and selectively enable / disable single decoders |
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with the options @code{--enable-decoder=@var{DECODER}} / |
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@code{--disable-decoder=@var{DECODER}}. |
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The option @code{-codecs} of the ff* tools will display the list of |
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enabled decoders. |
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@c man end DECODERS |
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@chapter Video Decoders |
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@c man begin VIDEO DECODERS |
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A description of some of the currently available video decoders |
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follows. |
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@section rawvideo |
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Raw video decoder. |
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This decoder decodes rawvideo streams. |
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@subsection Options |
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@table @option |
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@item top @var{top_field_first} |
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Specify the assumed field type of the input video. |
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@table @option |
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@item -1 |
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the video is assumed to be progressive (default) |
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@item 0 |
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bottom-field-first is assumed |
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@item 1 |
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top-field-first is assumed |
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@end table |
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@end table |
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@c man end VIDEO DECODERS |
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@chapter Audio Decoders |
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@c man begin AUDIO DECODERS |
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@section ffwavesynth |
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Internal wave synthetizer. |
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This decoder generates wave patterns according to predefined sequences. Its |
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use is purely internal and the format of the data it accepts is not publicly |
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documented. |
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@section libcelt |
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libcelt decoder wrapper. |
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libcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio codec. |
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Requires the presence of the libcelt headers and library during configuration. |
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You need to explicitly configure the build with @code{--enable-libcelt}. |
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@section libgsm |
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libgsm decoder wrapper. |
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libgsm allows libavcodec to decode the GSM full rate audio codec. Requires |
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the presence of the libgsm headers and library during configuration. You need |
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to explicitly configure the build with @code{--enable-libgsm}. |
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This decoder supports both the ordinary GSM and the Microsoft variant. |
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@section libilbc |
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libilbc decoder wrapper. |
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libilbc allows libavcodec to decode the Internet Low Bitrate Codec (iLBC) |
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audio codec. Requires the presence of the libilbc headers and library during |
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configuration. You need to explicitly configure the build with |
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@code{--enable-libilbc}. |
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@subsection Options |
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The following option is supported by the libilbc wrapper. |
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@table @option |
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@item enhance |
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Enable the enhancement of the decoded audio when set to 1. The default |
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value is 0 (disabled). |
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@end table |
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@section libopencore-amrnb |
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libopencore-amrnb decoder wrapper. |
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libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate |
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Narrowband audio codec. Using it requires the presence of the |
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libopencore-amrnb headers and library during configuration. You need to |
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explicitly configure the build with @code{--enable-libopencore-amrnb}. |
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An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB |
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without this library. |
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@section libopencore-amrwb |
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libopencore-amrwb decoder wrapper. |
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libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate |
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Wideband audio codec. Using it requires the presence of the |
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libopencore-amrwb headers and library during configuration. You need to |
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explicitly configure the build with @code{--enable-libopencore-amrwb}. |
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An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB |
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without this library. |
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@section libopus |
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libopus decoder wrapper. |
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libopus allows libavcodec to decode the Opus Interactive Audio Codec. |
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Requires the presence of the libopus headers and library during |
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configuration. You need to explicitly configure the build with |
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@code{--enable-libopus}. |
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@c man end AUDIO DECODERS |
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@chapter Subtitles Decoders |
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@c man begin SUBTILES DECODERS |
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@section dvdsub |
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This codec decodes the bitmap subtitles used in DVDs; the same subtitles can |
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also be found in VobSub file pairs and in some Matroska files. |
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@subsection Options |
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@table @option |
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@item palette |
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Specify the global palette used by the bitmaps. When stored in VobSub, the |
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palette is normally specified in the index file; in Matroska, the palette is |
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stored in the codec extra-data in the same format as in VobSub. In DVDs, the |
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palette is stored in the IFO file, and therefore not available when reading |
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from dumped VOB files. |
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The format for this option is a string containing 16 24-bits hexadecimal |
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numbers (without 0x prefix) separated by comas, for example @code{0d00ee, |
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ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1, |
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7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b}. |
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@end table |
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@c man end SUBTILES DECODERS
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