mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-13 10:44:59 +00:00
90 lines
2.4 KiB
Plaintext
90 lines
2.4 KiB
Plaintext
@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
|