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doc/encoders: add libvorbis doc

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Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
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Timothy Gu 2013-10-16 20:33:48 -07:00 committed by Stefano Sabatini
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doc/encoders.texi
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@ -771,6 +771,58 @@ respectively. The default is 0 (cutoff disabled).
@end table
@section libvorbis
libvorbis encoder wrapper.
Requires the presence of the libvorbisenc headers and library during
configuration. You need to explicitly configure the build with
@code{--enable-libvorbis}.
@subsection Options
The following options are supported by the libvorbis wrapper. The
@command{oggenc}-equivalent of the options are listed in parentheses.
To get a more accurate and extensive documentation of the libvorbis
options, consult the libvorbisenc's and @command{oggenc}'s documentations.
See @url{http://xiph.org/vorbis/},
@url{http://wiki.xiph.org/Vorbis-tools}, and oggenc(1).
@table @option
@item b (@emph{-b})
Set bitrate expressed in bits/s for ABR. @command{oggenc} @option{-b} is
expressed in kilobits/s.
@item q (@emph{-q})
Set constant quality setting for VBR. The value should be a float
number in the range of -1.0 to 10.0. The higher the value, the better
the quality. The default value is @samp{3.0}.
This option is valid only using the @command{ffmpeg} command-line tool.
For library interface users, use @option{global_quality}.
@item cutoff (@emph{--advanced-encode-option lowpass_frequency=N})
Set cutoff bandwidth in Hz, a value of 0 disables cutoff. @command{oggenc}'s
related option is expressed in kHz. The default value is @samp{0} (cutoff
disabled).
@item minrate (@emph{-m})
Set minimum bitrate expressed in bits/s. @command{oggenc} @option{-m} is
expressed in kilobits/s.
@item maxrate (@emph{-M})
Set maximum bitrate expressed in bits/s. @command{oggenc} @option{-M} is
expressed in kilobits/s. This only has effect on ABR mode.
@item iblock (@emph{--advanced-encode-option impulse_noisetune=N})
Set noise floor bias for impulse blocks. The value is a float number from
-15.0 to 0.0. A negative bias instructs the encoder to pay special attention
to the crispness of transients in the encoded audio. The tradeoff for better
transient response is a higher bitrate.
@end table
@section libwavpack
A wrapper providing WavPack encoding through libwavpack.