doc: document cutoff option to ac3 and adjust the option's global documentation
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>
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Michael Niedermayer
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@@ -138,7 +138,8 @@ Set audio sampling rate (in Hz).
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Set number of audio channels.
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@item cutoff @var{integer} (@emph{encoding,audio})
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Set cutoff bandwidth.
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Set cutoff bandwidth. (Supported only by selected encoders, see
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their respective documentation sections.)
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@item frame_size @var{integer} (@emph{encoding,audio})
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Set audio frame size.
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