diff options
Diffstat (limited to 'doc/decoders.texi')
-rw-r--r-- | doc/decoders.texi | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/doc/decoders.texi b/doc/decoders.texi new file mode 100644 index 0000000000..2d812a27ff --- /dev/null +++ b/doc/decoders.texi @@ -0,0 +1,89 @@ +@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. + +@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 |