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doc: document cutoff option to ac3 and adjust the option's global documentation

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cutoff is implemented as an option global to lavc, but supported only
by a few encoders. This fact is now reflected in its documentation. ac3's
support of this option is added for completeness.

Signed-off-by: Moritz Barsnick <barsnick@gmx.net>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Moritz Barsnick 2016-12-30 18:08:14 +01:00 committed by Michael Niedermayer
parent 6c442e1584
commit 5dbce5120b
2 changed files with 6 additions and 1 deletions
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3
doc/codecs.texi
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@ -138,7 +138,8 @@ Set audio sampling rate (in Hz).
Set number of audio channels.
@item cutoff @var{integer} (@emph{encoding,audio})
Set cutoff bandwidth.
Set cutoff bandwidth. (Supported only by selected encoders, see
their respective documentation sections.)
@item frame_size @var{integer} (@emph{encoding,audio})
Set audio frame size.

4
doc/encoders.texi
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@ -488,6 +488,10 @@ is an optional AC-3 feature that increases quality by selectively encoding
the left/right channels as mid/side. This option is enabled by default, and it
is highly recommended that it be left as enabled except for testing purposes.
@item cutoff @var{frequency}
Set lowpass cutoff frequency. If unspecified, the encoder selects a default
determined by various other encoding parameters.
@end table
@subsection Floating-Point-Only AC-3 Encoding Options