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Diffstat (limited to 'doc/encoders.texi')
-rw-r--r-- | doc/encoders.texi | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/doc/encoders.texi b/doc/encoders.texi index 9f9e9a9284..5ab3f334f2 100644 --- a/doc/encoders.texi +++ b/doc/encoders.texi @@ -433,3 +433,49 @@ For more information about libx264 and the supported options see: @url{http://www.videolan.org/developers/x264.html} @c man end VIDEO ENCODERS + +@subheading Floating-Point-Only AC-3 Encoding Options + +These options are only valid for the floating-point encoder and do not exist +for the fixed-point encoder due to the corresponding features not being +implemented in fixed-point. + +@table @option + +@item -channel_coupling @var{boolean} +Enables/Disables use of channel coupling, which is an optional AC-3 feature +that increases quality by combining high frequency information from multiple +channels into a single channel. The per-channel high frequency information is +sent with less accuracy in both the frequency and time domains. This allows +more bits to be used for lower frequencies while preserving enough information +to reconstruct the high frequencies. This option is enabled by default for the +floating-point encoder and should generally be left as enabled except for +testing purposes or to increase encoding speed. +@table @option +@item -1 +@itemx auto +Selected by Encoder (default) +@item 0 +@itemx off +Disable Channel Coupling +@item 1 +@itemx on +Enable Channel Coupling +@end table + +@item -cpl_start_band @var{number} +Coupling Start Band. Sets the channel coupling start band, from 1 to 15. If a +value higher than the bandwidth is used, it will be reduced to 1 less than the +coupling end band. If @var{auto} is used, the start band will be determined by +the encoder based on the bit rate, sample rate, and channel layout. This option +has no effect if channel coupling is disabled. +@table @option +@item -1 +@itemx auto +Selected by Encoder (default) +@end table + +@end table + +@c man end ENCODERS + |